Patent US2996631A successfully refreshed from Google Patents.
US2996631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring rate compensator
Assignee: North American Aviation Corp
•
Filing: 1956-01-12
•
Granted: 1961-08-15
•
Expires: 1976-01-12
Abstract
No abstract record available.
Inventors
- 👤 Walter R Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:07
CPC Classifications
G; G01; G01C; G01C19/00; G01C19/02; G01C19/34; G01C19/38; Y; Y10; Y10T; Y10T74/00; Y10T74/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1324054A
Cited
US1267214A
Cited
US1351027A
Cited
GB265949A
Cited
US2349287A
Cited
US2592417A
Cited
US2709921A
Cited
US2720620A
Cited
US2712757A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-14 | 1965-02-13 | 1965-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-14 | 1969-02-13 | 1969-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-14 | 1973-02-13 | 1973-08-15 | $7700.00 | Window Closed / Lapsed |