Patent US2455303A successfully refreshed from Google Patents.
US2455303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary pump
Assignee: Individual
•
Filing: 1945-03-05
•
Granted: 1948-11-30
•
Expires: 1965-03-05
Abstract
No abstract record available.
Inventors
- 👤 Earl L Grate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:32
CPC Classifications
F; F01; F01C; F01C21/00; F01C21/08; F01C21/0809; F01C21/0818; F01C21/0827; F01C21/0845
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US502890A
Cited
US625446A
Cited
US786143A
Cited
US883955A
Cited
US1006035A
Cited
US1010956A
Cited
GB185160A
Cited
FR26703E
Cited
US2326803A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-30 | 1952-05-31 | 1952-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-30 | 1956-05-31 | 1956-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-30 | 1960-05-31 | 1960-11-30 | $7700.00 | Window Closed / Lapsed |