US3381939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic draw works with automatic power output control
Assignee: Baker Hughes Holdings LLC
•
Filing: 1966-01-24
•
Granted: 1968-05-07
•
Expires: 1986-01-24
Abstract
No abstract record available.
Inventors
- 👤 Cicero C Brown
- 👤 Ernest L Potts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:30
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/46; F16H61/475; B; B66; B66D; B66D1/00; B66D1/02; B66D1/08; B66D2700/00; B66D2700/01; B66D2700/0125; B66D2700/0133; F16H61/42; F16H61/423
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2008687A
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DE1046286B
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GB876440A
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US3106108A
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US3213618A
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US3203185A
Cited
US3194017A
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US3237407A
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US3238724A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-07 | 1971-11-06 | 1972-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-07 | 1975-11-06 | 1976-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-07 | 1979-11-06 | 1980-05-07 | $7700.00 | Window Closed / Lapsed |