US2846015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self fill differential collar
Assignee: Halliburton Oil Well Cementing Co
•
Filing: 1957-05-10
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Granted: 1958-08-05
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Expires: 1977-05-10
Abstract
No abstract record available.
Inventors
- 👤 Forrest C Pittman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:39
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/10; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7854
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1715504A
Cited
US2211846A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-04 | 1962-02-03 | 1962-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-04 | 1966-02-03 | 1966-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-04 | 1970-02-03 | 1970-08-05 | $7700.00 | Window Closed / Lapsed |