Patent US4252837A successfully refreshed from Google Patents.
US4252837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blade shields
Assignee: Warner Lambert Co LLC
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Filing: 1978-05-31
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Granted: 1981-02-24
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Expires: 1998-05-31
Abstract
Abstract A razor blade having vacuum deposited structural elements guarding its cutting edge. A plurality of ion plated structural elements are deposited over the blade edge and extending down the edge facets a certain distance. The spacing and extension of the elements beyond the edge are controlled during the deposition process in order to provide desirable shaving characteristics. The blade edge and guard are covered with an adherent film of polytetrafluoroethylene.
Inventors
- 👤 John P. Auton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:32
CPC Classifications
B; B26; B26B; B26B21/00; B26B21/40; B26B21/4006; B23; B23P; B23P15/00; B23P15/28
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
88 words
A method for forming a guard over a razor blade edge comprising the steps of: placing the blade in a vacuum chamber, masking the blade edge in a predetermined pattern, establishing a vacuum, introducing an inert gas into the chamber after establishing said vacuum, applying an electrical potential between an anode and a cathode in the chamber sufficient to create a plasma, and interacting said plasma with a material in the chamber so that the material is deposited on the blade edge in accordance with the masking pattern.
Claim 2
Independent Claim
88 words
A method for forming a guard over a razor blade edge comprising the steps of: placing the blade in a vacuum chamber, masking the blade edge in a predetermined pattern, establishing a vacuum, introducing an inert gas into the chamber after establishing said vacuum, applying an electrical potential between an anode and a cathode in the chamber sufficient to create a plasma, and interacting said plasma with a material in the chamber so that the material is deposited on the blade edge in accordance with the masking pattern.
Claim 3
Dependent Claim
21 words
A razor blade having a guard over the cutting edge, the guard formed in accordance with the method of claim 1.
Claim 4
Dependent Claim
36 words
The method of claim 1 wherein sufficient material is interacted with said plasma for sufficient time that said material deposited on the blade edge extends approximately 12 microns to approximately 100 microns beyond the blade edge.
Claim 5
Dependent Claim
39 words
The method of claim 1 wherein a negative potential is applied to the blade with respect to the anode in the chamber thereby to create the plasma, and the material is vaporized before entering into interaction with the plasma.
Claim 6
Dependent Claim
36 words
The method of claim 4 wherein sufficient material is interacted with said plasma for sufficient time that said material deposited on the blade edge extends approximately 12 microns to approximately 100 microns beyond the blade edge.
Claim 7
Dependent Claim
31 words
The method of claim 4 wherein the anode is a filament containing the material which is deposited, the filament being heated by an electrical current applied thereto for vaporizing the material.
Claim 8
Dependent Claim
47 words
The method of claim 6 wherein said heating of said filament by said electrical current is caused to occur subsequent to the creation of the plasma thereby cleaning the blade edge by collision with ionized inert gas molecules prior to depositing vaporized material on the blade edge.
Claim 9
Dependent Claim
50 words
The method of claim 7 wherein the chamber is first evacuated to a pressure of approximately 10 -5 Torr, argon gas is introduced to a pressure between 10 -2 and 5×10 -2 Torr and the negative voltage is adjusted to between approximately -3 and -5 KV to establish the plasma.
Claim 10
Dependent Claim
34 words
The method of claim 8 wherein the masking is accomplished by the use of a foil having slots therein, the slots having a width substantially equal to the desired width of the deposited material.
Claim 11
Dependent Claim
23 words
The method of claim 8 wherein the blade is cleaned for a period of approximately 15 minutes prior to the material being vaporized.
References Cited (Backward Citations)
US1846622A
Cited
CA988456A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |