Patent US2928469A successfully refreshed from Google Patents.
US2928469A
Expired / Lapsed
US
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Well packer with ejectable plug
Assignee: Baker Hughes Oilfield Operations LLC
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Filing: 1958-05-12
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Granted: 1960-03-15
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Expires: 1978-05-12
Abstract
No abstract record available.
Inventors
- 👤 Talmadge L Crowe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:33
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/129; E21B33/1294
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1994846A
Cited
US1835444A
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US2121051A
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US2169569A
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US2187487A
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US2196661A
Cited
US2781774A
Cited
US2884071A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-15 | 1963-09-14 | 1964-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-15 | 1967-09-14 | 1968-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-15 | 1971-09-14 | 1972-03-15 | $7700.00 | Window Closed / Lapsed |