Patent US2812722A successfully refreshed from Google Patents.
US2812722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power drive for reciprocating well pumps
Assignee: Individual
•
Filing: 1955-12-06
•
Granted: 1957-11-12
•
Expires: 1975-12-06
Abstract
No abstract record available.
Inventors
- 👤 David C Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:31
CPC Classifications
F; F04; F04B; F04B9/00; F04B9/02; F04B9/04; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18208
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1751474A
Cited
US2213927A
Cited
US2226461A
Cited
US2382080A
Cited
US2591951A
Cited
US2573753A
Cited
US2573948A
Cited
US2691941A
Cited
US2702510A
Cited
US2727469A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-11 | 1961-05-13 | 1961-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-11 | 1965-05-13 | 1965-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-11 | 1969-05-13 | 1969-11-12 | $7700.00 | Window Closed / Lapsed |