US2768695A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controllably filling well casing
Assignee: Baker Hughes Oilfield Operations LLC
•
Filing: 1953-04-27
•
Granted: 1956-10-30
•
Expires: 1973-04-27
Abstract
No abstract record available.
Inventors
- 👤 Jr William S Althouse
- 👤 John F Muse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:57
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/10; E21B2200/00; E21B2200/05; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1632; Y10T137/1669; Y10T137/1677
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1818508A
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US2162578A
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US2615519A
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US2718265A
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US2713914A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-30 | 1960-04-30 | 1960-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-30 | 1964-04-30 | 1964-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-30 | 1968-04-30 | 1968-10-30 | $7700.00 | Window Closed / Lapsed |