US3468079A - Abrasive-like tool device - Google Patents
Abrasive-like tool device Download PDFInfo
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- US3468079A US3468079A US584314A US3468079DA US3468079A US 3468079 A US3468079 A US 3468079A US 584314 A US584314 A US 584314A US 3468079D A US3468079D A US 3468079DA US 3468079 A US3468079 A US 3468079A
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- Prior art keywords
- abrasive
- tool device
- generally
- disc
- air
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- Expired - Lifetime
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- 239000000463 material Substances 0.000 description 23
- 230000004048 modification Effects 0.000 description 7
- 238000012986 modification Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 239000003082 abrasive agent Substances 0.000 description 4
- 239000011324 bead Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 241001561902 Chaetodon citrinellus Species 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/54—Chiropodists' instruments, e.g. pedicure
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T407/00—Cutters, for shaping
- Y10T407/18—File or rasp
- Y10T407/1815—Rotary file or round disc
Definitions
- This invention relates to abrasive-like tool device and method of utilizing same, and more particularly to abrasive-like tool device of improved safety and effectiveness and to method of using such device to remove dead or callused tissue.
- Yet another primary object of this invention in addition to each of the foregoing objects, is to provide abrasive-like tool device having readily removable and replaceable abrasive material.
- Another and yet still further primary object of this invention is to provide improved methods of removing dead or callused tissue.
- the invention resides in the combination, construction, arrangement and disposition of the various component parts and elements incorporated in improved abrasivelike tool device constructed in accordance with the prinvciples of this invention and to methods of utilizing the same.
- the present invention will be better understood and objects and important features other than those specifically enumerated above will become apparent when consideration is given to the following details and description, which when taken in conjunction with the annexed drawing describes, discloses, shows and illustrates certain preferred embodiments or modifications of the present invention and what is presently considered and believed to be the best mode of practicing the principles thereof.
- Other embodiments or modifications may be suggested to those having the benefits of the teachings herein, and such other embodiments or modifications are intended to be reserved especially as they fall within the scope and spirit of the subjoiued claims.
- FIG. 1 is a schematic illustration of the device constructed in accordance with the principles of the present invention and the method of utilizing the same;
- FIG. 2 is an elevational cross-sectional View taken along line 2 2 of FIG. l;
- FIG. 3 is an enlarged partial view taken along line 3-3 of FIG. 2 partially broken away to illustrate certain details of construction
- FIG. 4 is a cross-sectional elevational View similar to FIG. 2 illustrating another form of the invention.
- FIG. 5 is an elevational cross-sectional view similar to FIGS. 2 and 3 illustrating yet another embodiment ICC constructed in accordance with the principles of the present invention.
- FIGS. 13 there is shown and illustrated an abrasive-like tool device constructed in accordance with the principles of this invention and designated generally by the reference character 10.
- the device 10 comprises support means 12 for supporting an abrasive-like material 14, means for enabling the support means 12 and the abrasive means 14 to be rotated, designated by the reference character 16, guard means 18 structurally associated with the support means 12 and constructed and arranged to prevent inadvertent contact with the edge portion of the abrasive means 14, and chip clearing means 20 to produce a flow of air relative to the abrasive-like material 14 to clear chips away from the cutting elements thereof and reduce clogging of the abrasive-like material 14.
- the support means 12 is preferably of generally circular configuration provided with a recess 22 defined in part by a generally circular surface 24.
- the support means 12 is further provided with a generally annular bead 26 eX- tending generally longitudinally upwardly thereof adjacent the periphery to dene the guard means 18.
- the inner edge wall 28 of the bead 26 further defines the recess 22.
- the support means 12 is further provided with a generally axially centrally extending bore 30 and with a counter bore 32 adjacent the bore 30 and within the surface 24 of the recess 22.
- the abrasive-like material 14 may be fabricated of sheet metal, cut to a generally circular configuration adapted to iit within the recess 22.
- the sheet of metal forming the abrasive-like material 14 may be pierced in a plurality of locations, as at the location 34 and bent upwardly to form a plurality of pointed cutting elements 36 adjacent the location 34 to provide the abrasive-like qualities to the material 14.
- An abrasive-like material commercially available suitable for use with the present invention is sold under the name of Devil Skin by the Red Devil Company.
- the abrasive-like material 14 may be removably mounted with the support means 20 by means, such as a screw 38 adapted to pass through an aperture 40 provided generally centrally of the material 14, through the bore 30 provided in the support means 20 and engaged with a threaded aperture 42 provided in a mandrel 44.
- the mandrel 44 and the screw 38 therefore dene the means 16 for enabling the movement of the abrasivelike material 1'4 and the support means 20.
- a ber washer 45, or the like, may be provided between the head of the screw 38 and the abrasive-like material 14, if desired.
- the chip clearing means 20 comprises a plurality of air scoops 46 projecting generally rearwardly and outwardly of the support means 12 and air flow directing means, such as passageways 48 for conducting air :between the scoops 46 and the recess 22.
- the scoops 46 and the air flow directing .means 48 preferably integrally formed with the support means 12, and the scoops 46 are provided with holes for 50 enabling air passage therethrough.
- the air flow directing means or passages 48 are of generally circular configuration, as shown. Accordingly, during rotation of the device 10, air will be directed through the scoops 46 and through the apertures 34 in the abrasivelike material 14 to preclude clogging of the cutting elements 36 thereof.
- the device 10 may be utilized to remove dead or callused tissue from a body member, such as a foot 52 by structurally associating the mandrel ⁇ 44 with a power unit 54, or the like, and manipulating the power unit 54 and the device 10 to tangentially contact the dead or callused tissue to be removed with the abrassive-like material 14.
- a body member such as a foot 52
- the power unit 54 and the device 10 may be utilized to remove dead or callused tissue from a body member, such as a foot 52 by structurally associating the mandrel ⁇ 44 with a power unit 54, or the like, and manipulating the power unit 54 and the device 10 to tangentially contact the dead or callused tissue to be removed with the abrassive-like material 14.
- air flow through the scoops 46 precludes clogging of the cutting elements 36 of the abrasive-like material 14.
- FIG. 4 there is shown and illustrated a modified device generally designated by the reference character 10.
- the device 10' is substantially similar to the device 10, and accordingly like reference characters are used to designate like parts, With the reference characters pertaining to the device 10' being primed.
- the support means 12 of the device 10' is associated with the mandrel 44' directly by means, such as the screw 38 and the abrasive-like material 14 is secured within the recess 22 by means of a plurality of engaging devices 56 projecting outwardly from the surface 24 adapted to resiliently engage the abrasive-like material by a snapfit within the apertures 34 enabling simple and rapid removal and replacement of the abrasive-like material 14.
- the device 10 is substantially similarto the devices 10 and 10' and like reference characters are utlized to indicate like parts, with the reference characters being double primed.
- the abrasive-like material 14 is secured with the support means 12" by adhesive .means 58, such as a disk of double-stick tape. If the abrasive-like material 14 comprises a conventional imperforate abrasive material, such as sandpaper, or the like, then the chip clearing means may fbe eliminated, or, as shown in FIG.
- the apparatus 10 may be provided with a huh portion 60 extending generally axially centrally of the backing member 12".
- the ⁇ screw is recessed within a bore 62 extending axially inwardly ofthe support surface 24" to define a space ⁇ 64 between the head of the screw 38 and the adhesive 58.
- a plurality of scoops y66 may be provided to direct a flow of air to the space ⁇ 64, as by means of passages 68 upon rotation of the apparatus 10".
- the adhesive layer 58 and the abrasive-like material 14" would then be provided with central apertures 70 and 72, respectively, adapted to be aligned with the bore 62 to enable the fiow of air produced by the scoops ⁇ 66 to be directed generally outwardly along the surface of the abrasive-like material 14" as shown to prevent clogging of the abrasive-like material 14".
- Abrasive-like tool device comprising, in combination, a disc of perforate abrasive material, a backing disc disposed in supporting relationship to said abrasive material, a mandrel extending generally axially rearwardly of said backing disc to enable rotation thereof and means for securing said abrasive disc against the face of said' backing disc for rotation therewith; said backing disc comprising, in turn, a plurality of openings extending therethrough in alignment and fluid communication with substantial numbers of the abrasive disc perforations and air scoop means extending generally rearwardly outwardly of said support disc to produce a substantial flow of air through the abrasive disc apertures upon rotation.
- Tool device defined in claim 2 wherein said holding means comprises a plurality of resilient stud members extending generally forwardly of said support disc and through selected ones of said abrasive disc perforations.
- Tool device defined in claim 4 wherein said abrasive disc is pierced and bent to provide a plurality of outwardly extending cutting edges.
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Surgery (AREA)
- Heart & Thoracic Surgery (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Description
Sept. 23, 1969 J. w. KAQFMAN 3,468,07Q
ABRASIVE-LIKE TOOL DEVICE Filed Sept. 21, 1966 INVENTOR.
,JACK W. KAUFMAN BY 4M fwd ATTORNEYS United States Patent O U.S. Cl. 51-378 5 Claims ABSTRACT F THE DISCLOSURE Rotary file having perforate abrasive means and a backing disc provided with air scoops for directing a flow of air through the perforations of the abrasive.
This invention relates to abrasive-like tool device and method of utilizing same, and more particularly to abrasive-like tool device of improved safety and effectiveness and to method of using such device to remove dead or callused tissue.
It is a primary object of this invention to provide abrasive-like tool device of improved effectiveness and safety.
It is another primary object of this invention to provide abrasive-like tool device which precludes clogging of the cutting edges during use.
It is a further primary object of this invention, in addition to the foregoing objects, to provide abrasive-like tool device having guard means to preclude inadvertent injury.
Yet another primary object of this invention, in addition to each of the foregoing objects, is to provide abrasive-like tool device having readily removable and replaceable abrasive material.
Another and yet still further primary object of this invention, in addition to each of the foregoing objects, is to provide improved methods of removing dead or callused tissue.
The invention resides in the combination, construction, arrangement and disposition of the various component parts and elements incorporated in improved abrasivelike tool device constructed in accordance with the prinvciples of this invention and to methods of utilizing the same. The present invention will be better understood and objects and important features other than those specifically enumerated above will become apparent when consideration is given to the following details and description, which when taken in conjunction with the annexed drawing describes, discloses, shows and illustrates certain preferred embodiments or modifications of the present invention and what is presently considered and believed to be the best mode of practicing the principles thereof. Other embodiments or modifications may be suggested to those having the benefits of the teachings herein, and such other embodiments or modifications are intended to be reserved especially as they fall within the scope and spirit of the subjoiued claims.
In the drawing:
FIG. 1 is a schematic illustration of the device constructed in accordance with the principles of the present invention and the method of utilizing the same;
FIG. 2 is an elevational cross-sectional View taken along line 2 2 of FIG. l;
FIG. 3 is an enlarged partial view taken along line 3-3 of FIG. 2 partially broken away to illustrate certain details of construction;
FIG. 4 is a cross-sectional elevational View similar to FIG. 2 illustrating another form of the invention; and
FIG. 5 is an elevational cross-sectional view similar to FIGS. 2 and 3 illustrating yet another embodiment ICC constructed in accordance with the principles of the present invention.
With reference now to the drawing, and particularly to FIGS. 13 thereof, there is shown and illustrated an abrasive-like tool device constructed in accordance with the principles of this invention and designated generally by the reference character 10.
The device 10 comprises support means 12 for supporting an abrasive-like material 14, means for enabling the support means 12 and the abrasive means 14 to be rotated, designated by the reference character 16, guard means 18 structurally associated with the support means 12 and constructed and arranged to prevent inadvertent contact with the edge portion of the abrasive means 14, and chip clearing means 20 to produce a flow of air relative to the abrasive-like material 14 to clear chips away from the cutting elements thereof and reduce clogging of the abrasive-like material 14.
The support means 12 is preferably of generally circular configuration provided with a recess 22 defined in part by a generally circular surface 24. The support means 12 is further provided with a generally annular bead 26 eX- tending generally longitudinally upwardly thereof adjacent the periphery to dene the guard means 18. The inner edge wall 28 of the bead 26 further defines the recess 22.
The support means 12 is further provided with a generally axially centrally extending bore 30 and with a counter bore 32 adjacent the bore 30 and within the surface 24 of the recess 22.
The abrasive-like material 14 may be fabricated of sheet metal, cut to a generally circular configuration adapted to iit within the recess 22. The sheet of metal forming the abrasive-like material 14 .may be pierced in a plurality of locations, as at the location 34 and bent upwardly to form a plurality of pointed cutting elements 36 adjacent the location 34 to provide the abrasive-like qualities to the material 14. An abrasive-like material commercially available suitable for use with the present invention is sold under the name of Devil Skin by the Red Devil Company.
The abrasive-like material 14 may be removably mounted with the support means 20 by means, such as a screw 38 adapted to pass through an aperture 40 provided generally centrally of the material 14, through the bore 30 provided in the support means 20 and engaged with a threaded aperture 42 provided in a mandrel 44. The mandrel 44 and the screw 38 therefore dene the means 16 for enabling the movement of the abrasivelike material 1'4 and the support means 20. A ber washer 45, or the like, may be provided between the head of the screw 38 and the abrasive-like material 14, if desired.
The chip clearing means 20 comprises a plurality of air scoops 46 projecting generally rearwardly and outwardly of the support means 12 and air flow directing means, such as passageways 48 for conducting air :between the scoops 46 and the recess 22. The scoops 46 and the air flow directing .means 48 preferably integrally formed with the support means 12, and the scoops 46 are provided with holes for 50 enabling air passage therethrough. The air flow directing means or passages 48 are of generally circular configuration, as shown. Accordingly, during rotation of the device 10, air will be directed through the scoops 46 and through the apertures 34 in the abrasivelike material 14 to preclude clogging of the cutting elements 36 thereof.
With particular reference to FIG. 1, the device 10 may be utilized to remove dead or callused tissue from a body member, such as a foot 52 by structurally associating the mandrel `44 with a power unit 54, or the like, and manipulating the power unit 54 and the device 10 to tangentially contact the dead or callused tissue to be removed with the abrassive-like material 14. During use, air flow through the scoops 46 precludes clogging of the cutting elements 36 of the abrasive-like material 14.
With particular reference now to FIG. 4, there is shown and illustrated a modified device generally designated by the reference character 10. The device 10' is substantially similar to the device 10, and accordingly like reference characters are used to designate like parts, With the reference characters pertaining to the device 10' being primed.
The support means 12 of the device 10' is associated with the mandrel 44' directly by means, such as the screw 38 and the abrasive-like material 14 is secured within the recess 22 by means of a plurality of engaging devices 56 projecting outwardly from the surface 24 adapted to resiliently engage the abrasive-like material by a snapfit within the apertures 34 enabling simple and rapid removal and replacement of the abrasive-like material 14.
Referring now more particularly to FIG. 5 of the drawing, there is shown and illustrated yet another embodiment or modification of device constructed in accordance with the principles of this invention and designated generally by the reference character The device 10 is substantially similarto the devices 10 and 10' and like reference characters are utlized to indicate like parts, with the reference characters being double primed. The abrasive-like material 14 is secured with the support means 12" by adhesive .means 58, such as a disk of double-stick tape. If the abrasive-like material 14 comprises a conventional imperforate abrasive material, such as sandpaper, or the like, then the chip clearing means may fbe eliminated, or, as shown in FIG. 5, the apparatus 10" may be provided with a huh portion 60 extending generally axially centrally of the backing member 12". The `screw is recessed within a bore 62 extending axially inwardly ofthe support surface 24" to define a space `64 between the head of the screw 38 and the adhesive 58. A plurality of scoops y66 may be provided to direct a flow of air to the space `64, as by means of passages 68 upon rotation of the apparatus 10". The adhesive layer 58 and the abrasive-like material 14" would then be provided with central apertures 70 and 72, respectively, adapted to be aligned with the bore 62 to enable the fiow of air produced by the scoops `66 to be directed generally outwardly along the surface of the abrasive-like material 14" as shown to prevent clogging of the abrasive-like material 14".
While the invention has been shown, illustrated, described and disclosed as applied to a disk-shaped device adapted to be directly rotated to provide the abrasive action, it should be understood that the present invention is also applicable to otherwise configured devices, such as drums, belts, orbitly moving devices, or the like, and the abrasive-like material may be secured within the recess by other means, such as inwardly resilient gripping of the bead 26.
It is to be understood that terminology such as forwardly, rearwardly, inwardly and outwardly, as used in the preceding description and in the subjoined claims, along with other similar directional terminology, is to be construed and interpreted in its normal and accepted sense. However, such terminology is not to be construed or interpreted in a limiting sense either in the preceding description or the subjoined claims, since the same is used merely to facilitate an understanding of, and to clearly set forth and particularly define, the present invent.
While the invention has been shown, illustrated, described and `disclosed in terms of certain preferred embodiments or modifications which it has assumed in practice, the scope of the invention should not be deemed to be limited by the precise embodiments or modifications herein shown, illustrated, described or disclosed, such other embodiments or modifications as may be suggested to those having the benefit of the teachings herein being intended to be reserved especially as they fall within the scope and breadth of the claims here appended.
What is claimed is:
1. Abrasive-like tool device comprising, in combination, a disc of perforate abrasive material, a backing disc disposed in supporting relationship to said abrasive material, a mandrel extending generally axially rearwardly of said backing disc to enable rotation thereof and means for securing said abrasive disc against the face of said' backing disc for rotation therewith; said backing disc comprising, in turn, a plurality of openings extending therethrough in alignment and fluid communication with substantial numbers of the abrasive disc perforations and air scoop means extending generally rearwardly outwardly of said support disc to produce a substantial flow of air through the abrasive disc apertures upon rotation.
2. Tool device defined in claim 1 wherein said openings are of generally circular configuration.
3*. Tool device defined in claim 2 wherein said holding means comprises a plurality of resilient stud members extending generally forwardly of said support disc and through selected ones of said abrasive disc perforations.
4. Tool device defined in claim 3 wherein said support disc is provided with a generally circular recess extending generally inwardly of the face thereof and defincdby a peripherally extending ridge of generally inverted U-shaped configuration and wherein said abrasive disc is disposed wit-hin said recess.
5. Tool device defined in claim 4 wherein said abrasive disc is pierced and bent to provide a plurality of outwardly extending cutting edges.
References Cited UNITED STATES PATENTS 691,740 1/ 1902 Birkenstock. 1,729,881 10/ 1929 Lambert 29--78 2,714,788 8/1955 Di Giovanna 12S-355 X 2,819,568 1/1958 Kasick 51-356 2,867,214 l/ 1959 Wilson 12S-355 2,877,775 3/1959 Hall. 2,996,852 8/ 1961 Gianatasio 51-378 FOREIGN PATENTS 22,853 11/1948 Finland.
OTHELL M. SIMPSON, Primary Examiner Us. c1. xn.
zza- 355; 29-7s; 51-70, 209, 395
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US58431466A | 1966-09-21 | 1966-09-21 |
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US3468079A true US3468079A (en) | 1969-09-23 |
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US584314A Expired - Lifetime US3468079A (en) | 1966-09-21 | 1966-09-21 | Abrasive-like tool device |
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Cited By (54)
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US3583107A (en) * | 1969-06-17 | 1971-06-08 | Isak Benis | Flexible sheet metal speed file |
US3683567A (en) * | 1969-12-24 | 1972-08-15 | Frank F Ali | Finishing tool |
US4834748A (en) * | 1987-09-29 | 1989-05-30 | Allergan, Inc. | Method and apparatus for removing corneal tissue |
US4872452A (en) * | 1989-01-09 | 1989-10-10 | Minnesota Mining And Manufacturing Company | Bone rasp |
US5174795A (en) * | 1990-05-21 | 1992-12-29 | Wiand Ronald C | Flexible abrasive pad with ramp edge surface |
US5297364A (en) * | 1990-01-22 | 1994-03-29 | Micron Technology, Inc. | Polishing pad with controlled abrasion rate |
US5454751A (en) * | 1990-03-30 | 1995-10-03 | Wiand; Ronald C. | Marble, granite and stone finishing and abrasive pads therefor |
US5551960A (en) * | 1993-03-12 | 1996-09-03 | Minnesota Mining And Manufacturing Company | Article for polishing stone |
US5607488A (en) * | 1990-05-21 | 1997-03-04 | Wiand; Ronald C. | Molded abrasive article and process |
US5632790A (en) * | 1990-05-21 | 1997-05-27 | Wiand; Ronald C. | Injection molded abrasive article and process |
US6081959A (en) * | 1996-07-01 | 2000-07-04 | Umbrell; Richard | Buffer centering system |
US6105197A (en) * | 1998-04-14 | 2000-08-22 | Umbrell; Richard T. | Centering system for buffing pad |
US6203407B1 (en) | 1998-09-03 | 2001-03-20 | Micron Technology, Inc. | Method and apparatus for increasing-chemical-polishing selectivity |
US6283978B1 (en) | 2000-06-09 | 2001-09-04 | Peter J. Cheski | Method and apparatus for microdermabrasion |
US6298518B1 (en) | 1998-04-14 | 2001-10-09 | Richard T. Umbrell | Heat dissipating buffing pad |
US6391034B1 (en) * | 2000-08-15 | 2002-05-21 | University Of South Florida | Surgical device and method for removing unwanted tissue |
US20020169462A1 (en) * | 2001-05-08 | 2002-11-14 | Stough Dowling B. | Wart removal method and device |
US6514132B2 (en) | 2001-06-16 | 2003-02-04 | Shinwoo Union Co., Ltd. | Hardened skin care instrument |
USRE37997E1 (en) | 1990-01-22 | 2003-02-18 | Micron Technology, Inc. | Polishing pad with controlled abrasion rate |
US20040148323A1 (en) * | 2003-01-28 | 2004-07-29 | Kameran Azadet | Multi-dimensional hybrid and transpose form finite impulse response filters |
US20040162566A1 (en) * | 2003-02-19 | 2004-08-19 | Unilever Home & Personal Care Usa, Division Of Conopco, Inc. | Epidermal sampling apparatus and method |
US20040162565A1 (en) * | 2003-02-19 | 2004-08-19 | Unilever Home & Personal Care Usa, Division Of Conopco, Inc. | Abrasion device and method |
US6911031B2 (en) * | 2001-09-24 | 2005-06-28 | Janelle Marie Muldner | Single-hand operable microdermabrasion device |
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US20070225732A1 (en) * | 2004-04-30 | 2007-09-27 | Cho Gyung S | Electrical Dermabrasion Device |
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Citations (8)
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US5454751A (en) * | 1990-03-30 | 1995-10-03 | Wiand; Ronald C. | Marble, granite and stone finishing and abrasive pads therefor |
US5632790A (en) * | 1990-05-21 | 1997-05-27 | Wiand; Ronald C. | Injection molded abrasive article and process |
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US5681362A (en) * | 1990-05-21 | 1997-10-28 | Wiand; Ronald C. | Molded abrasive article and process |
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