Patent US3469972A successfully refreshed from Google Patents.
US3469972A
Expired / Lapsed
US
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Razor blades and similar thin elongated sharp-edged blades made of a chromium steel
Assignee: Sandvik AB
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Filing: 1966-01-04
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Granted: 1969-09-30
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Expires: 1986-01-04
Abstract
No abstract record available.
Inventors
- 👤 Jan-Christer Henric Ove Carlen
- 👤 Francis Edward Flaherty
- 👤 Wyman Carrick Tupper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:44
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/22; B; B21; B21D; B21D53/00; B21D53/60; B21D53/64; B21D53/645; B26; B26B; B26B21/00; B26B21/54; B26B21/58
Claims Analysis
Total Claims: 0
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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) | 1972-09-29 | 1973-03-31 | 1973-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-29 | 1977-03-31 | 1977-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-29 | 1981-03-31 | 1981-09-30 | $7700.00 | Window Closed / Lapsed |