Patent US2976807A successfully refreshed from Google Patents.
US2976807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric motor-driven pump installation
Assignee: Perfect Circle Corp
•
Filing: 1956-10-02
•
Granted: 1961-03-28
•
Expires: 1976-10-02
Abstract
No abstract record available.
Inventors
- 👤 Robert H Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:43
CPC Classifications
H; H02; H02P; H02P1/00; H02P1/16; H02P1/26
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US652168A
Cited
US724224A
Cited
US1841601A
Cited
US2094807A
Cited
US2094811A
Cited
US2106685A
Cited
US2518597A
Cited
US2690713A
Cited
US2634390A
Cited
US2778313A
Cited
US2661697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |