Patent US3203829A successfully refreshed from Google Patents.
US3203829A
Expired / Lapsed
US
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Razor blades
Assignee: Eversharp Inc
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Filing: 1962-09-25
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Granted: 1965-08-31
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Expires: 1982-09-25
Abstract
No abstract record available.
Inventors
- 👤 Frank H Seyer
- 👤 Charles R Weidman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:47
CPC Classifications
B; B05; B05D; B05D3/00; B05D3/04; B26; B26B; B26B21/00; B26B21/54; B26B21/58; B26B21/60; C; C09; C09D; C09D123/00; C09D123/26; C09D123/28; C09D127/00; C09D127/02; C09D127/12; Y; Y10; Y10S; Y10S128/00; Y10S128/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
IN THE PROCESS FOR TREATING RAZOR BLADES WHEREBY A COATING OF POLYETRAFLUOROETHYLENE, POLYTRIFLUOROCHLOROETHYLENE, OR FLUORONATED ETHYLENEPROPYLENE IS APPLIED TO THE CUTTING EDGE OF THE BLADE SURFACE AND THE BLADE WITH SAID COATING THEREON IS HEATED TO CAUSE THE POLYTETRAFLUOROETHYLENE, POLYTRIFLUOROCHLOROETHYLENE, OR FLUORONATED ETHYLENEPROPYLENE TO FORM AN ADHERING FILM ON SAID CUTTING EDGE OF THE BLADE, THE IMPROVEMENT COMPRISING MAINTAINING THE BLADES IN A REDUCING ATMOSPHERE DURING THE BAKING OPERATION.
Claim 2
Dependent Claim
69 words
IN THE PROCESS FOR TREATING RAZOR BLADES WHEREBY A COATING OF POLYETRAFLUOROETHYLENE, POLYTRIFLUOROCHLOROETHYLENE, OR FLUORONATED ETHYLENEPROPYLENE IS APPLIED TO THE CUTTING EDGE OF THE BLADE SURFACE AND THE BLADE WITH SAID COATING THEREON IS HEATED TO CAUSE THE POLYTETRAFLUOROETHYLENE, POLYTRIFLUOROCHLOROETHYLENE, OR FLUORONATED ETHYLENEPROPYLENE TO FORM AN ADHERING FILM ON SAID CUTTING EDGE OF THE BLADE, THE IMPROVEMENT COMPRISING MAINTAINING THE BLADES IN A REDUCING ATMOSPHERE DURING THE BAKING OPERATION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-30 | 1969-03-01 | 1969-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-30 | 1973-03-01 | 1973-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-30 | 1977-03-01 | 1977-08-31 | $7700.00 | Window Closed / Lapsed |