US2644526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Casing collar for cementing wells
Assignee: Baker Hughes Oilfield Operations LLC
•
Filing: 1947-04-04
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Granted: 1953-07-07
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Expires: 1967-04-04
Abstract
No abstract record available.
Inventors
- 👤 Lee Francis Hampton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:37
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/12; E21B33/00; E21B33/10; E21B33/13; E21B33/14; E21B34/14; E21B34/142
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1684551A
Cited
US2201299A
Cited
US2214555A
Cited
US2360311A
Cited
US2330267A
Cited
US2471382A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |