US3422790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiengine drive arrangement
Assignee: CALVIN C CONNELL
•
Filing: 1966-11-14
•
Granted: 1969-01-21
•
Expires: 1986-11-14
Abstract
No abstract record available.
Inventors
- 👤 Calvin C Connell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:33
CPC Classifications
B; B63; B63H; B63H23/00; B63H5/00; B63H5/07; B63H5/08; B63H23/02; B63H23/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1019283A
Cited
US1802931A
Cited
US1781656A
Cited
US2501617A
Cited
GB602632A
Cited
US3155070A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |