Patent US1664741A successfully refreshed from Google Patents.
US1664741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Relieving attachment
Assignee: Pratt and Whitney Co Inc
•
Filing: 1925-01-10
•
Granted: 1928-04-03
•
Expires: 1945-01-10
Abstract
No abstract record available.
Inventors
- 👤 James W Durkee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:06
CPC Classifications
B; B23; B23Q; B23Q35/00; Y; Y10; Y10T; Y10T82/00; Y10T82/13; Y10T82/135
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1931-04-03 | 1931-10-03 | 1932-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-04-03 | 1935-10-03 | 1936-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-04-03 | 1939-10-03 | 1940-04-03 | $7700.00 | Window Closed / Lapsed |