US2651995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switch for automatic pumping units
Assignee: Phillips Petroleum Co
•
Filing: 1951-10-23
•
Granted: 1953-09-15
•
Expires: 1971-10-23
Abstract
No abstract record available.
Inventors
- 👤 Charles W Blackburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:56
CPC Classifications
G; G05; G05D; G05D7/00; G05D7/06; G05D7/0617; G05D7/0629; G05D7/0676; G05D7/0682
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2339957A
Cited
US2440931A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-14 | 1957-03-16 | 1957-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-14 | 1961-03-16 | 1961-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-14 | 1965-03-16 | 1965-09-15 | $7700.00 | Window Closed / Lapsed |