US3696013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processes for sharpening razor blades
Assignee: Gillette Co LLC
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Filing: 1970-01-06
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Granted: 1972-10-03
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Expires: 1990-01-06
Abstract
Abstract THE PRESENT INVENTION IS CONCERNED WITH PROVIDING IMPROVED ELECTROSHARPENING PROCESSES. GENERALLY, THE IMPROVEMENTS ARE BROUGHT ABOUT BY POSITIONING AN ELECTROPOSITIVE CONTROL ELECTRODE ADJACENT THE EDGE OR POINT BEING FORMED. THE USE OF SUCH ELECTRODES ENABLES ONE TO PRODUCE SHARPENED POINTS AND EDGES OF ESPECIALLY DESIRABLE GEOMETRY.
Inventors
- 👤 Bernard Tafapolsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:05
CPC Classifications
B; B23; B23H; B23H9/00; B23H9/08
Claims Analysis
Total Claims: 0
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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) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |