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Número de publicaciónUS3480483 A
Tipo de publicaciónConcesión
Fecha de publicación25 Nov 1969
Fecha de presentación4 May 1966
Fecha de prioridad6 May 1965
También publicado comoDE1553843A1, DE1553843B2
Número de publicaciónUS 3480483 A, US 3480483A, US-A-3480483, US3480483 A, US3480483A
InventoresWilkinson Anthony E F
Cesionario originalWilkinson Sword Ltd
Exportar citaBiBTeX, EndNote, RefMan
Enlaces externos: USPTO, Cesión de USPTO, Espacenet
Razor blades and methods of manufacture thereof
US 3480483 A
Resumen  disponible en
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Reclamaciones  disponible en
Descripción  (El texto procesado por OCR puede contener errores)

United States Patent US. Cl. 148-63 11 Claims ABSTRACT OF THE DISCLOSURE Coatings are formed on the cutting edge of steel razor blades by the steps of cleaning the cutting edge, applying to the cutting edge a thin layer of chromium of less than 400 Angstroms in thickness, preferably of less than 100 Angstroms, after which the blade is heat treated in a controlled oxidising atmosphere. The heat treating may be at a temperature of approximately 400 C. and at a pressure of approximately 10* torricelli.

The chromium content of the blades may be increased in the surface region of the cutting edge by a chromating process. Conversion of a substantial portion of the chromium on the cutting edge to chromium oxide may be effected by anodising, for example by means of a glow discharge or in a liquid electrolyte.

This invention relates to razor blades.

According to the present invention at least the surface region of at least the cutting edge or cutting edges of a razor blade comprise chromium oxide.

The provision of such a surface comprising chromium oxide is designed to impart improved properties to the razor blade by giving enhanced durability to the cutting edge or edges.

One method of providing the chromium oxide surface is first to coat with chromium which is thereafter oxidised. An alternative method is to coat the surface with chromium oxide thereby eliminating the oxidising step. Yet another method is to enrich the chromium content of at least the surface region of a stainless steel razor blade by a chromating process with subsequent oxidisation.

In greater detail, one method of manufacture is to clean the cutting edge or edges, thereafter applying a thin layer of chromium, for example, less than 400 Angstroms in thickness. A thickness of less than 100 Angtroms is preferred. The blade is next annealed to improve the bond with the coating and is then heat-treated in a controlled oxidising atmosphere. The chromium coating and subsequent heat treatment can be effected without impairing the cutting edge and in some circumstances may be efiected as a single operation.

Thereafter the blades may be provided with coatings or particles of materials to facilitate shaving, such as the already known or novel coatings referred to in the specification of Belgian Patent No. 504,784 of Apr. 5, 1963 in the name of Wilkinson Sword Limited. The heat treatment required to cure the polytetrafluoroethylene will in some cases be adequate to ensure adhesion between the vapour deposited chromium and the blade edge.

The method chosen for cleaning the blade should take account of the properties of the blade material, typical methods being by immersion in an organic solvent, for example, trichloroethylene, if necessary under ultrasonic vibration, with subsequent drying, by vapor degreasing in trichloroethylene, by glow discharge or by a brief anodic etching. If the latter method is used with an 3,480,483 Patented Nov. 25, 1969 aqueous solution of chromium trioxide, this can constitute the chromating process referred to above.

The selected method of coating the blade can likewise be chosen to 'be the most suitable for the material in question and examples of possible methods are by vapour deposition, by sputtering, possible with the sputtering direction in an ion beam, by electro-plating or by gas reaction.

Finally, it is necessary to effect controlled oxidation of the metal surface. This may be achieved by heat treatment in a controlled atmosphere in which the amount of oxygen present is strictly limited; for example the blade may be heated to 400 C. in air at a pressure of 10 torricelli. Another method is to anodise in a gaseous or liquid electrolyte; for example anodising may be by means of an air glow discharge at a low pressure, say a pressure of microns. A feature of the invention is that the amount of oxygen present during the oxidation process is strictly controlled.

Thus, considering the application of the process to stainless steels which can be used for razor blades, the process may typically involve vapour degreasing in trichloroethylene or chloroform, coating with chromium by vapour deposition, annealing in vacuum to bond the deposit to the edge, oxidising in a controlled atmosphere at temperatures up to 450 C. and applying a coating of polytetrafluoroethylene.

I claim:

1. The method of forming a chromium oxide coating on a cutting edge of a stainless steel razor blade comprising the steps of enriching the chromium content in the surface region of said cutting edge by a chromating process, and heat treating the cutting edge in a controlled oxidising atmosphere.

2. The method of forming a chromium oxide coating on a cutting edge of a steel razor blade comprising the steps of cleaning the cutting edge,

applying to the cutting edge a thin layer of chromium of less than 400 Angstroms in thickness, and

heat treating the blade in a controlled oxidising atmosphere to convert a substantial proportion of the chromium to chromium oxide.

3. The method according to claim 2, wherein said heat treating comprises heating to a temperature of approximately 400 C. in air at very low pressure.

4. The method according to claim 2, wherein said chromium is applied by vapour deposition.

5. The method according to claim 2, wherein said chromium is applied by sputtering.

6. The method according to claim 2, wherein said controlled oxidising atmosphere is at a pressure of approxi mately 1O torricelli.

7. The method according to claim 2, wherein said coating of chromium is of less than 100 Angstroms.

8. The method according to claim 2, comprising the further step of applying to the chromium oxide coating a coating of polytetrafluoroethylene.

9. The method of forming a chromium oxide coating on a cutting edge of a steel razor blade comprising the steps of cleaning the cutting edge,

applying to the cutting edge a thin layer of chromium of less than 400 Angstroms in thickness, and anodising the chromium coating to convert a substantial proportion of the chromium to chromium oxide.

10. The method according to claim 9, wherein the anodising is effected by means of a glow discharge in the presence of a restricted amount of oxygen.

11. The method according to claim 9, wherein the anodising is eflected in a liquid electrolyte.

References Cited UNITED STATES PATENTS 4 FOREIGN PATENTS 6/1949 Canada. 4/ 1967 Great Britain.

5 RALPH S. KENDALL, Primary Examiner US. Cl. X.R.

Citas de patentes
Patente citada Fecha de presentación Fecha de publicación Solicitante Título
US3071856 *31 Dic 19598 Ene 1963Irwin W FischbeinRazor blade and method of making same
US3283117 *22 Abr 19651 Nov 1966Philip Morris IncMethod for coating cutting edges of sharpened instruments
US3345202 *10 Jun 19633 Oct 1967Eversharp IncMethod of making razor blades
CA457378A *14 Jun 1949Gillette Safety Razor CompanyFine edged cutting implements and the manufacture thereof
GB1065723A * Título no disponible
Citada por
Patente citante Fecha de presentación Fecha de publicación Solicitante Título
US3634147 *20 Nov 196911 Ene 1972United States Steel CorpCorrosion resistant tin-free steel and method for producing same
US3635811 *6 Nov 196718 Ene 1972Warner Lambert CoMethod of applying a coating
US3652443 *25 Ago 197028 Mar 1972Gillette CoDeposition apparatus
US3754329 *29 Sep 197128 Ago 1973Warner Lambert CoRazor blade with rf sputtered coating
US3773544 *1 Jun 197120 Nov 1973Steel CorpFluorocarbon polymer coated substrate
US3805387 *22 May 197223 Abr 1974American Optical CorpFiber razor blade
US3811189 *19 Mar 197321 May 1974Gillette CoProcess for producing an improved cutting tool
US3829969 *5 Nov 197020 Ago 1974Gillette CoCutting tool with alloy coated sharpened edge
US3835537 *19 Mar 197317 Sep 1974Gillette CoImproved cutting tool
US3871836 *20 Dic 197218 Mar 1975Allied ChemCutting blades made of or coated with an amorphous metal
US3890109 *6 Abr 197317 Jun 1975Wilkinson Sword LtdRazor blades having high purity Al{hd 2{b O{HD 3 {B coating
US3900636 *18 Jul 197419 Ago 1975Gillette CoMethod of treating cutting edges
US3904506 *25 Sep 19739 Sep 1975Shatterproof Glass CorpApparatus for continuous production of sputter-coated glass products
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US9032628 *13 Ene 201219 May 2015Eveready Battery Company, Inc.Razor blade technology
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US91805998 Sep 200410 Nov 2015Bic-Violex S.A.Method of deposition of a layer on a razor blade edge and razor blade
US93939846 May 201419 Jul 2016Stanley Black & Decker, Inc.Utility knife blade
US20030121158 *10 Feb 20033 Jul 2003The Gillette Company, A Delaware CorporationRazor blade technology
US20040172832 *4 Mar 20039 Sep 2004Colin ClipstoneRazor blade
US20050268470 *3 Jun 20048 Dic 2005Skrobis Kenneth JColored razor blades
US20060174977 *21 Ago 200310 Ago 2006Tadahiro OhmiMetal material having formed thereon chromium oxide passive film and method for producing the same, and parts contacting with fluid and system for supplying fluid and exhausting gas
US20060265885 *14 Mar 200630 Nov 2006The Gillette Company, A Delaware CorporationRazor blade
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US20130180117 *13 Ene 201218 Jul 2013Eveready Battery Company Inc.Razor Blade Technology
US20150096164 *12 Dic 20149 Abr 2015Eveready Battery Company Inc.Razor Blade Technology
USRE29989 *15 Mar 19778 May 1979Allied Chemical CorporationCutting blades made of or coated with an amorphous metal
DE19800758A1 *12 Ene 199815 Jul 1999Fraunhofer Ges ForschungVerfahren zum Beschichten von Folie aus Nickel oder einer Nickellegierung und beschichtete Folie aus Nickel oder einer Nickellegierung
DE19800758C2 *12 Ene 199831 Ago 2000Fraunhofer Ges ForschungVerfahren zum Beschichten von Folie aus Nickel oder einer Nickellegierung und beschichtete Folie aus Nickel oder einer Nickellegierung
EP0591339A1 *11 Jun 199213 Abr 1994The Gillette CompanyImprovements in or relating to razor blades
EP0591339A4 *11 Jun 199231 Ago 1994The Gillette CompanyTítulo no disponible
WO1992019425A2 *22 Abr 199212 Nov 1992The Gillette CompanyImprovements in or relating to razor blades
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Clasificaciones
Clasificación de EE.UU.148/276, 30/346.53, 428/469, 205/188, 204/192.16, 148/286
Clasificación internacionalC23C10/60, C23C8/02, C23C14/58, C23C10/00, C23C14/16
Clasificación cooperativaC23C14/16, C23C14/5853, C23C10/60, C23C14/58, C23C8/02
Clasificación europeaC23C14/16, C23C8/02, C23C14/58, C23C10/60, C23C14/58H2