US2944603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subsurface electric current generating apparatus
Assignee: Baker Hughes Oilfield Operations LLC
•
Filing: 1956-01-30
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Granted: 1960-07-12
•
Expires: 1976-01-30
Abstract
No abstract record available.
Inventors
- 👤 Reuben C Baker
- 👤 Thomas M Ragan
- 👤 Cecil W Wents
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:49
CPC Classifications
E; E21; E21B; E21B41/00; E21B41/0085; E21B23/00; E21B23/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US867063A
Cited
US2202887A
Cited
US2315775A
Cited
US2389711A
Cited
US2630067A
Cited
US2618343A
Cited
US2637402A
Cited
US2764027A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-12 | 1964-01-11 | 1964-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-12 | 1968-01-11 | 1968-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-12 | 1972-01-11 | 1972-07-12 | $7700.00 | Window Closed / Lapsed |