US3900636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating cutting edges
Assignee: Gillette Co LLC
•
Filing: 1974-07-18
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Granted: 1975-08-19
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Expires: 1994-07-18
Abstract
Abstract The present invention is concerned with providing improved cutting edges on cutting instruments such as razor blades by implanting in the cutting edge ions of a metal, reactive nonmetal, or an inert gas.
Inventors
- 👤 Francis Russell Curry
- 👤 Colin John Clipstone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:43
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/48; B; B26; B26B; B26B21/00; B26B21/54
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
60 words
A PROCESS FOR IMPROVING A COATED STEEL CUTTING EDGE, SAID PROCESS COMPRISING IMPLANTING IONS SELECTED FROM THE GROUP CONSISTING OF METALS, REACTIVE NON-METALS AND INERT GASES INTO SAID CUTTING EDGE, SAID IONS BEING PROPELED AT SAID CUTTING EDGE IN THE FORM OF AN ION BEAM AT ENERGIES OF BETWEEN ABOUT 10 TO 400 KEV UNTIL A DOSE OF BETWEEN ABOUT
Claim 2
Dependent Claim
60 words
A PROCESS FOR IMPROVING A COATED STEEL CUTTING EDGE, SAID PROCESS COMPRISING IMPLANTING IONS SELECTED FROM THE GROUP CONSISTING OF METALS, REACTIVE NON-METALS AND INERT GASES INTO SAID CUTTING EDGE, SAID IONS BEING PROPELED AT SAID CUTTING EDGE IN THE FORM OF AN ION BEAM AT ENERGIES OF BETWEEN ABOUT 10 TO 400 KEV UNTIL A DOSE OF BETWEEN ABOUT
Claim 3
Dependent Claim
16 words
A process as defined in claim 1 in which said cutting edge is a razor blade.
Claim 4
Dependent Claim
28 words
A process as defined in claim 2 in which metallic or non-metallic ions which will improve the hardness or corrosion resistance of the steel cutting edge are implanted.
Claim 5
Dependent Claim
51 words
A process as defined in claim 2 in which a thin metal coating is on the cutting edge and metallic or non-metallic ions which will improve the hardness or corrosion resistance of the coating are implanted at energies at which a substantial proportion of the ions will be in the coating.
Claim 6
Dependent Claim
44 words
A process as defined in claim 2 wherein a thin metallic coating is on the cutting edge and metallic, non-metallic or inert gas ions are implanted at energies such as to penetrate through the cutting edge-coating interface to improve the adhesion of said coating.
Claim 7
Dependent Claim
48 words
A process as defined in claim 2 in which the cutting edge is coated with a polytetrafluoroethylene coating and ions will improve the adhesion of the polyethylene are implanted at energies such that a substantial proportion of said ions are implanted withiN 100A of the polytetrafluoroethylene substrate surface.
Claim 8
Dependent Claim
17 words
A process as defined in claim 6 in which said ions are selected from chromium and fluorine.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |