Patent US2940039A successfully refreshed from Google Patents.
US2940039A
Expired / Lapsed
US
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Well bore electrical generator
Assignee: California Research LLC
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Filing: 1957-06-10
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Granted: 1960-06-07
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Expires: 1977-06-10
Abstract
No abstract record available.
Inventors
- 👤 Yost Lloyd
- 👤 William R Wilson
- 👤 Raymond A Mccreary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:48
CPC Classifications
E; E21; E21B; E21B41/00; E21B41/0085; E21B47/00; E21B47/12; E21B47/13
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2364957A
Cited
US2728893A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |