US2866674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double acting piston seal
Assignee: North American Aviation Corp
•
Filing: 1956-01-12
•
Granted: 1958-12-30
•
Expires: 1976-01-12
Abstract
No abstract record available.
Inventors
- 👤 Charles E Hamlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:04
CPC Classifications
F; F16; F16J; F16J9/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US511423A
Cited
USRE16978E
Cited
US1399060A
Cited
US1757016A
Cited
US2139387A
Cited
US2226273A
Cited
FR865837A
Cited
US2579115A
Cited
US2630357A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-29 | 1962-06-30 | 1962-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-29 | 1966-06-30 | 1966-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-29 | 1970-06-30 | 1970-12-30 | $7700.00 | Window Closed / Lapsed |