US2675880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perforation washing apparatus
Assignee: Baker Hughes Oilfield Operations LLC
•
Filing: 1948-06-28
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Granted: 1954-04-20
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Expires: 1968-06-28
Abstract
No abstract record available.
Inventors
- 👤 Aaron A Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:53
CPC Classifications
E; E21; E21B; E21B37/00; E21B37/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1992933A
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US2048136A
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US2390112A
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US2275938A
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US2326940A
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US2402886A
Cited
US2404876A
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US2577068A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-19 | 1957-10-19 | 1958-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-19 | 1961-10-19 | 1962-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-19 | 1965-10-19 | 1966-04-20 | $7700.00 | Window Closed / Lapsed |