Patent US3413090A successfully refreshed from Google Patents.
US3413090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of silicon nitride whiskers
Assignee: Duracell Inc USA
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Filing: 1965-03-19
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Granted: 1968-11-26
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Expires: 1985-03-19
Abstract
No abstract record available.
Inventors
- 👤 Richard H Krock
- 👤 Robert H Kelsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:23
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/06; C01B21/068; C01B21/0682; C01P; C01P2004/00; C01P2004/10; C01P2006/00; C01P2006/10
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) | 1971-11-26 | 1972-05-27 | 1972-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-26 | 1976-05-27 | 1976-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-26 | 1980-05-27 | 1980-11-26 | $7700.00 | Window Closed / Lapsed |