US2797196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil base drilling fluid
Assignee: Pan American Petroleum Corp
•
Filing: 1953-08-03
•
Granted: 1957-06-25
•
Expires: 1973-08-03
Abstract
No abstract record available.
Inventors
- 👤 Thomas H Dunn
- 👤 James L Lummus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:38
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/32; C09K8/36; Y; Y10; Y10S; Y10S507/00; Y10S507/901
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2554222A
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US2531812A
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US2573650A
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US2623852A
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US2675353A
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US2612471A
Cited
US2623853A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-06-24 | 1960-12-24 | 1961-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-24 | 1964-12-24 | 1965-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-24 | 1968-12-24 | 1969-06-25 | $7700.00 | Window Closed / Lapsed |