US2470987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary pump stator
Assignee: Individual
•
Filing: 1947-09-03
•
Granted: 1949-05-24
•
Expires: 1967-09-03
Abstract
No abstract record available.
Inventors
- 👤 James P Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:33
CPC Classifications
F; F01; F01C; F01C1/00; F01C1/30; F01C1/40; F01C1/44; F04; F04C; F04C2/00; F04C2/30; F04C2/34; F04C2/344; F04C2/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US872234A
Cited
US2165963A
Cited
GB509953A
Cited
US2352941A
Cited
US2260888A
Cited
US2272635A
Cited
US2347944A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-23 | 1952-11-22 | 1953-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-23 | 1956-11-22 | 1957-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-23 | 1960-11-22 | 1961-05-24 | $7700.00 | Window Closed / Lapsed |