US2481545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling fluids and methods of using the same
Assignee: Phillips Petroleum Co
•
Filing: 1947-08-11
•
Granted: 1949-09-13
•
Expires: 1967-08-11
Abstract
No abstract record available.
Inventors
- 👤 Cary R Wagner
- 👤 Martin A Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:40
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/206
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2129913A
Cited
US2425768A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-09-12 | 1953-03-14 | 1953-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-09-12 | 1957-03-14 | 1957-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-09-12 | 1961-03-14 | 1961-09-13 | $7700.00 | Window Closed / Lapsed |