US2690713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well pumping control
Assignee: THESSEN
•
Filing: 1950-07-12
•
Granted: 1954-10-05
•
Expires: 1970-07-12
Abstract
No abstract record available.
Inventors
- 👤 Benjamin H Urmann
- 👤 Albert J Whitehill
- 👤 Wayne H Thessen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:29
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1629329A
Cited
US1845179A
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US2106204A
Cited
US2242589A
Cited
US2424657A
Cited
US2473726A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-04 | 1958-04-05 | 1958-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-04 | 1962-04-05 | 1962-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-04 | 1966-04-05 | 1966-10-05 | $7700.00 | Window Closed / Lapsed |