US2820312A
Expired / Lapsed
US
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Assignee: North American Aviation Corp
•
Filing: 1954-12-23
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Granted: 1958-01-21
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Expires: 1974-12-23
Abstract
No abstract record available.
Inventors
- 👤 Jr Leland I Coontz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:55
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/02; C23F1/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US393867A
Cited
US825961A
Cited
GB167298A
Cited
US1725454A
Cited
US1851028A
Cited
US2371859A
Cited
US2341702A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |