Patent US3774703A successfully refreshed from Google Patents.
US3774703A
Expired / Lapsed
US
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Razor blades and methods of manufacture thereof
Assignee: Wilkinson Sword Ltd
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Filing: 1971-04-14
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Granted: 1973-11-27
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Expires: 1991-04-14
Abstract
Abstract On a razor blade having at least one cutting edge there are provided two different superposed coatings, each coating being of a metal, a metallic compound, a silicon compound or an alloy of any of the foregoing. Preferably the upper coating is itself coated with a polymer which improves the shaving properties of the blade, for example polytetrafluoroethylene.
Inventors
- 👤 M Sanderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:52
CPC Classifications
B; B26; B26B; B26B21/00; B26B21/54; B26B21/58; B26B21/60; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10S428/9265; Y10S428/932; Y10T; Y10T428/00; Y10T428/12; Y10T428/12389; Y10T428/12493; Y10T428/12535; Y10T428/12542; Y10T428/12549; Y10T428/12556; Y10T428/12569; Y10T428/12576; Y10T428/12583; Y10T428/1259; Y10T428/12611; Y10T428/12771; Y10T428/12778; Y10T428/12806; Y10T428/12826; Y10T428/12847; Y10T428/12854; Y10T428/31504; Y10T428/3154
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
17 words
A razor blade according to claim 1, wherein the surface region of the lower coating is oxidised.
Claim 2
Dependent Claim
81 words
A razor blade for shaving having at least one cutting edge, a first coating on said cutting edge comprising an alloy to strengthen said cutting edge, reduce corrosion thereof and reduce damage to said cutting edge during shaving and a second coating different from said first coating and superposed thereon, said second coating comprising a metal compound to improve the wear resistant and corrosion protection properties to present a surface less susceptible to progressive wear during shaving than said first coating.
Claim 3
Dependent Claim
16 words
A razor blade according to claim 3, wherein the second coating is a refractory metal compound.
Claim 4
Dependent Claim
14 words
A razor blade according to claim 3, wherein the second coating is a nitride.
Claim 5
Dependent Claim
19 words
A razor blade according to claim 3, wherein each coating has a thickness of between 50 and 450 Angstroms.
Claim 6
Dependent Claim
20 words
A razor blade according to claim 3, wherein said first coating has a thickness of between 70 and 200 Angstroms.
Claim 7
Dependent Claim
20 words
A razor blade according to claim 3, wherein said second coating has a thickness of between 50 and 150 Angstroms.
Claim 8
Dependent Claim
21 words
A razor blade according to claim 3, wherein a coating of a shaving facilitating polymer is provided on said second coating.
Claim 9
Dependent Claim
20 words
A razor blade according to claim 3 wherein a coating of a fluorocarbon polymer is provided on said second coating.
Claim 10
Dependent Claim
18 words
A razor blade according to claim 3, wherein a coating of polytetrafluoroethylene is provided on said second coating.
Claim 11
Dependent Claim
24 words
A razor blade according to claim 3, wherein a coating of a copolymer of thio-carbonyl fluoride and tetrafluoroethylene is provided on said second coating.
Claim 12
Dependent Claim
35 words
A razor blade having at least one cutting edge carrying two different superposed coatings, the lower one of said coatings being of an alloy and the other of said coatings being a refractory silicon compound.
Claim 13
Dependent Claim
19 words
A razor blade according to claim 13, wherein each coating has a thickness of between 50 and 450 Angstroms.
Claim 14
Dependent Claim
20 words
A razor blade according to claim 13, wherein said lower coating has a thickness of between 70 and 200 Angstroms.
Claim 15
Dependent Claim
20 words
A razor blade according to claim 13, wherein said upper coating has a thickness of between 50 and 150 Angstroms.
Claim 16
Dependent Claim
21 words
A razor blade according to claim 13, wherein a coating of a shaving facilitating polymer is provided on said upper coating.
Claim 17
Dependent Claim
20 words
A razor blade according to claim 13, wherein a coating of a fluorocarbon polymer is provided on said upper coating.
Claim 18
Dependent Claim
18 words
A razor blade according to claim 13, wherein a coating of polytetrafluoroethylene is provided on said upper coating.
Claim 19
Dependent Claim
24 words
A razor blade according to claim 13, wherein a coating of a copolymer of thio-carbonyl fluoride and tetrafluoroethylene is provided on said upper coating.
Claim 20
Dependent Claim
88 words
A razor blade having at least one cutting edge, said cutting edge carrying a first coating selected from the group consisting of platinum, iridium, osmium, palladium, rhodium, ruthenium, titanium, zirconium, vanadium, niobium, tantalum, molybdenum, cobalt, nickel, manganese, rhenium, tungsten and alloys of the foregoing, said first coating having superposed thereon a second coating selected from the group consisting of carbides, borides, oxides, nitrides, silicides and fluorides, alone and mixed, of chromium, silicon, tungsten, molybdenum, cobalt, aluminium, manganese, vanadium, niobium, tantalum, titanium, zirconium, hafnium, rhenium and the rare earths.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |