US2684720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of drilling wells using lowwater-loss cement slurry
Assignee: Phillips Petroleum Co
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Filing: 1953-01-02
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Granted: 1954-07-27
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Expires: 1973-01-02
Abstract
No abstract record available.
Inventors
- 👤 Peggy J Lea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:51
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/42; C09K8/46; C09K8/467; C09K8/487; C04; C04B; C04B24/00; C04B24/16; C04B24/18; C04B28/00; C04B28/02; C04B2103/00; C04B2103/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-26 | 1958-01-25 | 1958-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-26 | 1962-01-25 | 1962-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-26 | 1966-01-25 | 1966-07-27 | $7700.00 | Window Closed / Lapsed |