Patent US2999545A successfully refreshed from Google Patents.
US2999545A
Expired / Lapsed
US
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Retrievable plug
Assignee: Baker Hughes Oilfield Operations LLC
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Filing: 1957-06-03
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Granted: 1961-09-12
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Expires: 1977-06-03
Abstract
No abstract record available.
Inventors
- 👤 Herbert L Bigelow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:08
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1020535A
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US2104270A
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US2253537A
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US2381553A
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US2651368A
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US2655216A
Cited
US2698054A
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US2846014A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-11 | 1965-03-13 | 1965-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-11 | 1969-03-13 | 1969-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-11 | 1973-03-13 | 1973-09-12 | $7700.00 | Window Closed / Lapsed |