Patent US3761372A successfully refreshed from Google Patents.
US3761372A
Expired / Lapsed
US
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Method for producing an improved cutting tool
Assignee: Gillette Co LLC
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Filing: 1971-07-09
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Granted: 1973-09-25
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Expires: 1991-07-09
Abstract
Abstract THE SHARPENED EDGE OF A CUTTING IMPLEMENT SUCH AS A RAZOR BLADE IS MODIFIED BY SUBJECTING THE CUTTING EDGE TO ION BOMBARDMENT AND STRENGTHENING MATERIAL DEPOSITION STEPS SO THAT A PORTION OF THE DEPOSITED STRENGTHENING MATERIAL IS REMOVED, THE CUTTING EDGE OF THE IMPLEMENT HAVING A RESULTING TIP RADIUS OF LESS THAN ABOUT 400 ANGSTROMS AND ADDED STRENGTHENING MATERIAL ON THE FLANKS SO THAT AT A DISTANCE OF 6,000 ANGSTROMS FROM THE TIP THE ADDED MATERIAL HAS A TOTAL THICKNESS OF AT LEAST ABOUT 400 ANGSTROMS.
Inventors
- 👤 A Sastri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:23
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/58; C23C14/5826; C23C14/5833; B; B26; B26B; B26B21/00; B26B21/54; B26B21/56; B26B21/58; C23C14/5873
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |