CA1130848A - Controlled temperature hair dryer - Google Patents
Controlled temperature hair dryerInfo
- Publication number
- CA1130848A CA1130848A CA316,748A CA316748A CA1130848A CA 1130848 A CA1130848 A CA 1130848A CA 316748 A CA316748 A CA 316748A CA 1130848 A CA1130848 A CA 1130848A
- Authority
- CA
- Canada
- Prior art keywords
- hair
- air
- dryer
- temperature
- heater
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- A—HUMAN NECESSITIES
- A45—HAND OR TRAVELLING ARTICLES
- A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
- A45D20/00—Hair drying devices; Accessories therefor
- A45D20/22—Helmets with hot air supply or ventilating means, e.g. electrically heated air current
- A45D20/30—Electric circuitry specially adapted for hair drying devices
-
- A—HUMAN NECESSITIES
- A45—HAND OR TRAVELLING ARTICLES
- A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
- A45D20/00—Hair drying devices; Accessories therefor
- A45D20/04—Hot-air producers
- A45D20/08—Hot-air producers heated electrically
- A45D20/10—Hand-held drying devices, e.g. air douches
- A45D20/12—Details thereof or accessories therefor, e.g. nozzles, stands
Abstract
ABSTRACT OF THE DISCLOSURE
A hair dryer, the temperature of the air stream from which is automatically controlled by the temperature of the hair being dried, is provided. The dryer includes a primary air inlet, a fan for blowing inlet air out of the dryer, and a heater by which the blown air is heated before it is directed against a user's hair. The dryer also includes a feedback air duct and a thermistor positioned in the duct to sense the temperature of the air being reflected off the user's hair as it is dried. In accordance with the temperature of the reflected air, the thermistor changes resistance, which change is sensed by an integrated circuit zero crossing switch that electronically signals a thyristor causing the thyristor either to switch off or proportionally reduce the power to the heater, and therefore the amount of heat energy input in the blown air. Consequently, the temperature of the air being blown against the user's hair is continuously monitored as the hair dries to avoid the hair and scalp from becoming overheated.
A hair dryer, the temperature of the air stream from which is automatically controlled by the temperature of the hair being dried, is provided. The dryer includes a primary air inlet, a fan for blowing inlet air out of the dryer, and a heater by which the blown air is heated before it is directed against a user's hair. The dryer also includes a feedback air duct and a thermistor positioned in the duct to sense the temperature of the air being reflected off the user's hair as it is dried. In accordance with the temperature of the reflected air, the thermistor changes resistance, which change is sensed by an integrated circuit zero crossing switch that electronically signals a thyristor causing the thyristor either to switch off or proportionally reduce the power to the heater, and therefore the amount of heat energy input in the blown air. Consequently, the temperature of the air being blown against the user's hair is continuously monitored as the hair dries to avoid the hair and scalp from becoming overheated.
Description
11308~8 CONTROLLED TEMPERATURE HAIR DRYER
BACKGROUND OF THE INVE~TION
This lnvention relates to a hair dryer. More specifically it relates to a hair dryer having means for sensing the temperature of hair being dried, so that the temperature of the drying air coming from the dryer is uatomatically reduced in accordance with the sensed tem-perature.
Hair drying is the removal of water from hair, such as after the hair has been washed. Some of the water in the hair is loose, bridging the hairs, and some is absorbed in each hair. Loose water, for the most part, can be removed by mechanical means, such as towel drying, combing or brushing. Absorbed water is best removed by evaporation.
The rate of evaporation is a function of the heat energy delivered to the hair, which raises its temperature to first break the bond of the water with the hair (heat of sorption) and to then convert the water into vapor.
If an air stream of constant temperature is directed against wet hair, most of the heat energy of the air stream will be absorbed by the hair causing the tempera-ture of the air reflected off the hair to be considerably lower than that of the hair stream. As evaporation proceeds and the hair dries, less of the heat energy of the air stream will be absorbed by the hair resulting in a high temperature of the reflected air, until finally, when most of the water is evaporated the temperature of the reflected air approaches the temperature of the air stream. By continuously sampling the temperature of the reflected air and controlling power to the heater, the dryer of this invention protects -the hair and scalp from being overheated. In addition, the temperature o~
the reflected air at a given distance may serve as a measure - of the dryness of the hair.
1130~348 Because the flexibility of hair decreases with its dryness, excessive drying can contribute to its damage.
Further, while hair can withstand high temperatures (160C
to 180C), the scalp exhibits pain sensations at air tempera-tures above 50C. When the hair is wet, the heat of the hair dryer air stream is absorbed by the water in and on the hair, so that no pain is felt by the user. However, when the hair is dry, it is heated faster and the air stream reaches the scalp, thereby possibly causing some pain.
U.S. Pat. No. 3,426,441, issued to Broski, describes a hair dryer that utilizes a thermistor for measuring the temperature of ambient air. U.S. Pat. No. 3,082,540, issued to Hiltenbrand, describes a hair dryer that measures the humidity of air that has already passed through hair being dried. Neither of these dryers, nor any other dryer of the prior art, is known to measure the temperature of air reflected off hair being dried, as does the dryer of the present invention. In response to such temperature measure-ment, the latter dryer is capable of automatically controlling the temperature of the hair and scalp during the drying operation, with the added advantage of limiting the level of dryness of the hair.
SUMMARY OF THE INVENTION
A hair dryer is provided which comprises a fan for blowing air out of the dryer and against a person's hair and a heater for heating the air before it is blown out of the dryer. Further, it comprises means for sensing the temperature of air being reflected off the person's hair as the hair is dried. The device furthçr comprises means operatively connected to the sensing means for regulating the heat . 1130848 output of the heater in accordance with the temperature of the reflected air, whereby as the hair is dried, the tem-perature of the air being blown out of the dryer is reduced to prevent excessive heating of the hair and scalp and limiting the ~evel of dryness of the hair.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a partially broken-away, side view of a hair dryer of the present invention.
Fig. 2 is a front view of the dryer of Fig. 1.
Fig. 3 is a rear view of the dryer of Fig. 1.
Fig. 4 is a schematic view of the electronic circuitry of the dryer of Fig. 1.
D TAILED DESCRIPTION OF THE INVENTION
A hair dryer 10 of this invention is shown in Fig. 1. The dryer has a housing 11, which defines a handle 12 and air inlets and an air outlet. As best shown in Fig. 2, an air oùtlet 13 is defined in the front portion of the dryer. Disposed in outlet 13 is an exhaust grill 14.
As best shown in Fig. 3, several primary air inlets 16 are defined in the rear portion of the dryer through which air is drawn into the dryer by a fan 17. The fan is powered by a fan motor 18 that receives electrical current through a conventional electrical cord (not shown) when the cord is plugged into a power source. A dual-switch 19 is provided in handle 12~ Switch 19 conventionally controls fan speed 113V~34E~
and power to the heater. E'orward of fan 17 near air outlet 13 is a heater assembly, generally indicated at 20. The heater assembly includes several heater coils 21 supported on a heater support board 22. Also supported on the board and electrically connected to coils 21 are a thermostat 23 and fuse 24, which additionally insure that the heater assembly does not overheat.
Housing 11 further defines a feedback air duct 25.
Positioned in the duct adjacent air outlet 13 is a thermistor 26, which is part of a temperature sensing circuit, generally indicated at 27. In the rear portion of duct 25 adjacent ~6R
primary air inlets 16 is a secondary air inlet i~.
Feedback air duct 25, thermistor 26, and tempera-ture sensing circuit 27 provide a means for determining the temperature of air being reflected off the user's hair as it is dried.
As indicated by arrows in Fig. 1, air entering inlets 16 is drawn into fan 17 and blown by the fan past heating coils 21. The air thus heated by the coils is blown out through outlet 13 against first the user's hair and then the scalp. Some of the air drying the hair is reflected back into the dryer through duct 25, particularly because of the suction effect created by fan 17. The reflected air in duct 25 is eventually circulated into the dryer through ~ G~.
secondary air inlet ~, but may also be exhausted without entering the dryer if that is desired.
~ 1130848 .
Thermistor 26 and temperature sensing circuit 27 are shown schematically in Fig. 4. Thermistor 26 is prefer-ably a negative temperature coefficient resistor, but may also be a positive temperature coefficient resistor. Such a thermistor is available from the Fenwall Electronics Corp., Waltham, MA, under the name "Model GA51L2". Proceeding right to left with reference to Fig. 4, thermistor 26 senses the temperature of the air being reflected off the user's hair as the dryer is used. In response to that temperature, the resistance of the thermistor changes. This change is detected by an integrated circuit zero crossing switch 28, which is composed of a comparator and a differential amplifier.
Such a useful sensing circuit is available from the RCA
Corporation, Sommerville, NJ, under the name "CA-3079".
Swtich 28 electrically provides a controlling signal to the thyristor 29, which cuts off or reduces the power to heater coils 21, thereby cutting off or reducing heat input into the air stream from the dryer. Such a thyristor is available from the RCA Corporation under the name of "Triac T-2080Ob".
By varying the power to the heater, the temperature of the air being blown against the user's hair is reduced as the hair dries. Consequently, even though the user may operate switch 19 to select a high fan speed and a high level of heat of the air being blown out of the dryer, the dryer automatically reduces the temperature of the air stream in accordance with the reflected air temperature from the hair to prevent the hair and scalp from being overheated.
Additionally, a neon lamp 30 is provided for indicating to the user when the heater is on or off and a potentiometer 31 is provided by which the sensitivity to temperature changes of thermistor 26 can be adjusted. Further, an opening 32 may be provided as shown in Fig. 1, betewen the heater area and duct 25 to allow thermistor 26 to sense the temperature of air deflected from the heater area and into the duct, if
BACKGROUND OF THE INVE~TION
This lnvention relates to a hair dryer. More specifically it relates to a hair dryer having means for sensing the temperature of hair being dried, so that the temperature of the drying air coming from the dryer is uatomatically reduced in accordance with the sensed tem-perature.
Hair drying is the removal of water from hair, such as after the hair has been washed. Some of the water in the hair is loose, bridging the hairs, and some is absorbed in each hair. Loose water, for the most part, can be removed by mechanical means, such as towel drying, combing or brushing. Absorbed water is best removed by evaporation.
The rate of evaporation is a function of the heat energy delivered to the hair, which raises its temperature to first break the bond of the water with the hair (heat of sorption) and to then convert the water into vapor.
If an air stream of constant temperature is directed against wet hair, most of the heat energy of the air stream will be absorbed by the hair causing the tempera-ture of the air reflected off the hair to be considerably lower than that of the hair stream. As evaporation proceeds and the hair dries, less of the heat energy of the air stream will be absorbed by the hair resulting in a high temperature of the reflected air, until finally, when most of the water is evaporated the temperature of the reflected air approaches the temperature of the air stream. By continuously sampling the temperature of the reflected air and controlling power to the heater, the dryer of this invention protects -the hair and scalp from being overheated. In addition, the temperature o~
the reflected air at a given distance may serve as a measure - of the dryness of the hair.
1130~348 Because the flexibility of hair decreases with its dryness, excessive drying can contribute to its damage.
Further, while hair can withstand high temperatures (160C
to 180C), the scalp exhibits pain sensations at air tempera-tures above 50C. When the hair is wet, the heat of the hair dryer air stream is absorbed by the water in and on the hair, so that no pain is felt by the user. However, when the hair is dry, it is heated faster and the air stream reaches the scalp, thereby possibly causing some pain.
U.S. Pat. No. 3,426,441, issued to Broski, describes a hair dryer that utilizes a thermistor for measuring the temperature of ambient air. U.S. Pat. No. 3,082,540, issued to Hiltenbrand, describes a hair dryer that measures the humidity of air that has already passed through hair being dried. Neither of these dryers, nor any other dryer of the prior art, is known to measure the temperature of air reflected off hair being dried, as does the dryer of the present invention. In response to such temperature measure-ment, the latter dryer is capable of automatically controlling the temperature of the hair and scalp during the drying operation, with the added advantage of limiting the level of dryness of the hair.
SUMMARY OF THE INVENTION
A hair dryer is provided which comprises a fan for blowing air out of the dryer and against a person's hair and a heater for heating the air before it is blown out of the dryer. Further, it comprises means for sensing the temperature of air being reflected off the person's hair as the hair is dried. The device furthçr comprises means operatively connected to the sensing means for regulating the heat . 1130848 output of the heater in accordance with the temperature of the reflected air, whereby as the hair is dried, the tem-perature of the air being blown out of the dryer is reduced to prevent excessive heating of the hair and scalp and limiting the ~evel of dryness of the hair.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a partially broken-away, side view of a hair dryer of the present invention.
Fig. 2 is a front view of the dryer of Fig. 1.
Fig. 3 is a rear view of the dryer of Fig. 1.
Fig. 4 is a schematic view of the electronic circuitry of the dryer of Fig. 1.
D TAILED DESCRIPTION OF THE INVENTION
A hair dryer 10 of this invention is shown in Fig. 1. The dryer has a housing 11, which defines a handle 12 and air inlets and an air outlet. As best shown in Fig. 2, an air oùtlet 13 is defined in the front portion of the dryer. Disposed in outlet 13 is an exhaust grill 14.
As best shown in Fig. 3, several primary air inlets 16 are defined in the rear portion of the dryer through which air is drawn into the dryer by a fan 17. The fan is powered by a fan motor 18 that receives electrical current through a conventional electrical cord (not shown) when the cord is plugged into a power source. A dual-switch 19 is provided in handle 12~ Switch 19 conventionally controls fan speed 113V~34E~
and power to the heater. E'orward of fan 17 near air outlet 13 is a heater assembly, generally indicated at 20. The heater assembly includes several heater coils 21 supported on a heater support board 22. Also supported on the board and electrically connected to coils 21 are a thermostat 23 and fuse 24, which additionally insure that the heater assembly does not overheat.
Housing 11 further defines a feedback air duct 25.
Positioned in the duct adjacent air outlet 13 is a thermistor 26, which is part of a temperature sensing circuit, generally indicated at 27. In the rear portion of duct 25 adjacent ~6R
primary air inlets 16 is a secondary air inlet i~.
Feedback air duct 25, thermistor 26, and tempera-ture sensing circuit 27 provide a means for determining the temperature of air being reflected off the user's hair as it is dried.
As indicated by arrows in Fig. 1, air entering inlets 16 is drawn into fan 17 and blown by the fan past heating coils 21. The air thus heated by the coils is blown out through outlet 13 against first the user's hair and then the scalp. Some of the air drying the hair is reflected back into the dryer through duct 25, particularly because of the suction effect created by fan 17. The reflected air in duct 25 is eventually circulated into the dryer through ~ G~.
secondary air inlet ~, but may also be exhausted without entering the dryer if that is desired.
~ 1130848 .
Thermistor 26 and temperature sensing circuit 27 are shown schematically in Fig. 4. Thermistor 26 is prefer-ably a negative temperature coefficient resistor, but may also be a positive temperature coefficient resistor. Such a thermistor is available from the Fenwall Electronics Corp., Waltham, MA, under the name "Model GA51L2". Proceeding right to left with reference to Fig. 4, thermistor 26 senses the temperature of the air being reflected off the user's hair as the dryer is used. In response to that temperature, the resistance of the thermistor changes. This change is detected by an integrated circuit zero crossing switch 28, which is composed of a comparator and a differential amplifier.
Such a useful sensing circuit is available from the RCA
Corporation, Sommerville, NJ, under the name "CA-3079".
Swtich 28 electrically provides a controlling signal to the thyristor 29, which cuts off or reduces the power to heater coils 21, thereby cutting off or reducing heat input into the air stream from the dryer. Such a thyristor is available from the RCA Corporation under the name of "Triac T-2080Ob".
By varying the power to the heater, the temperature of the air being blown against the user's hair is reduced as the hair dries. Consequently, even though the user may operate switch 19 to select a high fan speed and a high level of heat of the air being blown out of the dryer, the dryer automatically reduces the temperature of the air stream in accordance with the reflected air temperature from the hair to prevent the hair and scalp from being overheated.
Additionally, a neon lamp 30 is provided for indicating to the user when the heater is on or off and a potentiometer 31 is provided by which the sensitivity to temperature changes of thermistor 26 can be adjusted. Further, an opening 32 may be provided as shown in Fig. 1, betewen the heater area and duct 25 to allow thermistor 26 to sense the temperature of air deflected from the heater area and into the duct, if
Claims (2)
1. A hand held hair dryer comprising:
(a) a housing, said housing defining an air inlet, an air outlet and a handle;
(b) a fan disposed in said housing for drawing air through the air inlet into the housing and blowing it out the air outlet and against a person's hair;
(c) a heater for heating the air before it is blown out of the dryer disposed in said housing between the fan and the air outlet;
(d) a feedback air duct, adjacent the air outlet, having a thermistor positioned therein for sensing the temperature of air being reflected off the person's hair and drawn into the feedback air duct at the front of the hair dryer as the hair is dried; and (e) means operatively connected to the thermistor means for regulating the heat output of the heater by gradually reducing its power output in accordance with the temperature of the reflected air, whereby as the hair is dried the temperature of the air being blown out of the hair dryer is reduced to prevent the hair from being overheated.
(a) a housing, said housing defining an air inlet, an air outlet and a handle;
(b) a fan disposed in said housing for drawing air through the air inlet into the housing and blowing it out the air outlet and against a person's hair;
(c) a heater for heating the air before it is blown out of the dryer disposed in said housing between the fan and the air outlet;
(d) a feedback air duct, adjacent the air outlet, having a thermistor positioned therein for sensing the temperature of air being reflected off the person's hair and drawn into the feedback air duct at the front of the hair dryer as the hair is dried; and (e) means operatively connected to the thermistor means for regulating the heat output of the heater by gradually reducing its power output in accordance with the temperature of the reflected air, whereby as the hair is dried the temperature of the air being blown out of the hair dryer is reduced to prevent the hair from being overheated.
2. The dryer of claim 1 wherein the heat output regulating means comprises an integrated circuit zero crossing switch, which measures the resistance of the thermistor, and a thyristor, which cuts off or gradually reduces the power output of the heater, the switch directing the thyristor to cut off or reduce the power output of the heater in accordance with the resistance of the thermistor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US916,994 | 1978-06-19 | ||
| US05/916,994 US4260875A (en) | 1978-06-19 | 1978-06-19 | Controlled temperature hair dryer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1130848A true CA1130848A (en) | 1982-08-31 |
Family
ID=25438203
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA316,748A Expired CA1130848A (en) | 1978-06-19 | 1978-11-23 | Controlled temperature hair dryer |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4260875A (en) |
| CA (1) | CA1130848A (en) |
Families Citing this family (35)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2490469A1 (en) * | 1980-09-22 | 1982-03-26 | Bristol Myers Co | Temperature controlled hand held hair dryer - has thermistor detecting temp. of reflected hot air to regulate heat output |
| US4877042A (en) * | 1983-09-19 | 1989-10-31 | Downey John H | Dynamic hair grooming appliance |
| US4683370A (en) * | 1984-08-08 | 1987-07-28 | Wagner Spray Tech Corporation | Hot air gun with air directing housing |
| US4647757A (en) * | 1985-04-30 | 1987-03-03 | Clairol Incorporated | Hair dryer heater section providing uniform outlet air temperature distribution |
| DE3729774A1 (en) * | 1987-09-05 | 1989-03-16 | Krups Stiftung | ELECTRICALLY POWERED HAND HAIR DRYER |
| US4788413A (en) * | 1987-10-21 | 1988-11-29 | General Dynamics Corporation/Space Systems Division | System including a portable heat gun for curing advanced composite workpieces |
| US4996972A (en) * | 1989-10-23 | 1991-03-05 | The United States Of America As Represented By The Secretary Of The Navy | Hot air heat gun |
| FR2705875B1 (en) * | 1993-06-04 | 1995-07-13 | Seb Sa | Hair treatment and / or shaping apparatus comprising a vapor distribution tube. |
| US5434946A (en) * | 1994-02-03 | 1995-07-18 | Helen Of Troy Corporation | Hair dryer with continuously variable heat intensity and air flow speed |
| US5555637A (en) * | 1994-10-14 | 1996-09-17 | Production Engineered Designs, Inc. | Drying apparatus |
| WO2004012554A2 (en) * | 2002-08-01 | 2004-02-12 | Davies, Paul, R. | Improved personal care device with thermal feedback and operating conditions display |
| US6889445B1 (en) | 2004-01-06 | 2005-05-10 | Sunbeam Products, Inc. | Multi-wattage blow dryer with user inaccessible power selector |
| KR200364346Y1 (en) * | 2004-06-29 | 2004-10-11 | 주식회사 텐틴 | hair dryer |
| US20080181590A1 (en) * | 2007-01-30 | 2008-07-31 | Master Appliance Corp. | Heating device and method |
| US8800163B2 (en) | 2007-08-21 | 2014-08-12 | Heidi Schmid | Hair care appliance and method of using same |
| US8136263B2 (en) * | 2007-08-21 | 2012-03-20 | Heidi Schmid | Hair care appliance and method of using same |
| WO2009097321A1 (en) * | 2008-01-28 | 2009-08-06 | Conair Corporation | Hair dryer having front and side air intake ports |
| US8096062B1 (en) * | 2008-10-08 | 2012-01-17 | Bellen Mark L | Towel drying system |
| US20110120492A1 (en) * | 2009-11-23 | 2011-05-26 | Tiffany Worthy | Comb through blow dryer |
| CN202118981U (en) * | 2011-06-03 | 2012-01-18 | 深圳市顺章电器有限公司 | Integration machine core assembly of fan heater |
| FR2982947B1 (en) * | 2011-11-18 | 2014-01-10 | Seb Sa | METHOD FOR MEASURING THE EFFICIENCY OF A HAIRDRYER |
| US8942550B1 (en) * | 2012-05-24 | 2015-01-27 | Milton Carter | Variable speed heat air gun and cooperating kit |
| US10046894B1 (en) * | 2012-05-24 | 2018-08-14 | Milton Carter | Variable speed heat air gun and cooperating kit |
| CN207803715U (en) * | 2014-04-03 | 2018-09-04 | 戴森技术有限公司 | Hair dryer |
| JP6489933B2 (en) * | 2015-05-20 | 2019-03-27 | シャープ株式会社 | Blower |
| GB2543537B (en) | 2015-10-21 | 2018-09-19 | Dyson Technology Ltd | A handheld appliance |
| GB2543536B (en) * | 2015-10-21 | 2019-01-02 | Dyson Technology Ltd | A handheld appliance |
| GB2543538B (en) | 2015-10-21 | 2018-05-09 | Dyson Technology Ltd | A haircare appliance |
| US10485320B2 (en) * | 2016-08-19 | 2019-11-26 | Shih-Ling Hsu | Hair dryer |
| RU185888U1 (en) * | 2017-09-07 | 2018-12-21 | Дайсон Текнолоджи Лимитед | HAIR DRYER |
| WO2020016696A1 (en) * | 2018-07-18 | 2020-01-23 | Gamma S.P.A. | Air heating device for a hairdryer, blowing device for a hairdryer, and hairdryer comprising said devices |
| CN111345568A (en) * | 2018-12-20 | 2020-06-30 | 添可智能科技有限公司 | Intelligent hair drier and method for automatically controlling intelligent hair drier to work |
| US20220071367A1 (en) * | 2018-12-20 | 2022-03-10 | Tineco Intelligent Technology Co., Ltd. | Intelligent hair dryer, job control and information display methods thereof, and storage medium |
| JP6763585B2 (en) * | 2018-12-27 | 2020-09-30 | アイリスオーヤマ株式会社 | Dryer |
| US20220110432A1 (en) * | 2020-10-09 | 2022-04-14 | Maurice T. Simmons, JR. | Dual-power portable-use hair dryer |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2594101A (en) * | 1950-07-07 | 1952-04-22 | Westinghouse Electric Corp | Portable fan-type air heater |
| US3082540A (en) * | 1956-07-26 | 1963-03-26 | Ventilation Et D Electricite A | Hair drier |
| US3524044A (en) * | 1966-06-27 | 1970-08-11 | Vincent L Liardi | Deicing apparatus |
| US3426441A (en) * | 1967-01-30 | 1969-02-11 | Curtis Helene Ind Inc | Electric hair dryer |
| US3543005A (en) * | 1967-05-18 | 1970-11-24 | Leslie Andrew Kelemen | Temperature control system for an electrically heated blanket |
| US3588446A (en) * | 1969-03-03 | 1971-06-28 | Fieldcrest Mills Inc | Electrically heated bedcover and power modulating control circuits therefor |
| US3548157A (en) * | 1969-03-25 | 1970-12-15 | Stevens & Co Inc J P | Heating control circuit with triac-diac combination |
| SE346064B (en) * | 1971-02-08 | 1972-06-26 | S Janson | |
| US3920955A (en) * | 1973-09-20 | 1975-11-18 | Mitsubishi Electric Corp | Electronic thermally sensitive switch device |
| US3943329A (en) * | 1974-05-17 | 1976-03-09 | Clairol Incorporated | Hair dryer with safety guard air outlet nozzle |
| SE385352B (en) * | 1974-09-04 | 1976-06-28 | Janson Sven Olof | OVERHEAT PROTECTION FOR ELECTRICAL APPLIANCES |
| US3937989A (en) * | 1974-12-06 | 1976-02-10 | Multi-State Devices Ltd. | Temperature discrimination apparatus |
| US3946200A (en) * | 1975-02-24 | 1976-03-23 | Gca Corporation | Proportional temperature controller |
-
1978
- 1978-06-19 US US05/916,994 patent/US4260875A/en not_active Expired - Lifetime
- 1978-11-23 CA CA316,748A patent/CA1130848A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US4260875A (en) | 1981-04-07 |
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| JPH0148037B2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |