Patent US2488315A successfully refreshed from Google Patents.
Patent US2121051A successfully refreshed from Google Patents.
US2121051A
Expired / Lapsed
US
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Cement retainer
Assignee: Baker Hughes Oilfield Operations LLC
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Filing: 1937-07-14
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Granted: 1938-06-21
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Expires: 1957-07-14
Abstract
No abstract record available.
Inventors
- 👤 Thomas M Ragan
- 👤 Clarence E Burt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:26
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/129; E21B33/1294; E21B33/1293; E21B33/1295; E21B33/13; E21B33/134; E21B33/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1941-06-20 | 1941-12-20 | 1942-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-06-20 | 1945-12-20 | 1946-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-06-20 | 1949-12-20 | 1950-06-21 | $7700.00 | Window Closed / Lapsed |