US2943051A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil base drilling fluid
Assignee: Pan American Petroleum Corp
•
Filing: 1956-08-02
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Granted: 1960-06-28
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Expires: 1976-08-02
Abstract
No abstract record available.
Inventors
- 👤 James L Lummus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:03
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/32; Y; Y10; Y10S; Y10S507/00; Y10S507/91
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
95 words
AN OIL BASE DRILLING FLUID COMPRISING AN OIL HAVING A VISCOSITY BELOW ABOUT 200 CENTIPOISES, LECITHIN IN A CONCENTRATION BETWEEN ABOUT 1/2 AND ABOUT 10 POUNDS PER BARREL OF DRILLING FLUID, CALCIUM CHLORIDE IN A CONCENTRATION BETWEEN ABOUT 1/2 AND ABOUT 80 POUNDS PER BARREL OF DRILLING FLUID, WATER IN AN AMOUNT BETWEEN ABOUT 1/2 AND ABOUT 40 PERCENT BY VOLUME OF SAID DRILLING FLUID, AND INSUFFICIENT TO PRODUCE A DRILLING FLUID VISCOSITY EXCEEDING 250 CENTIPOISES, AND A FINELY DIVIDED SOLID IN A CONCENTRATION OF AT LEAST ABOUT 5 POUNDS PER BARREL OF DRILLING FLUID.
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) | 1963-06-28 | 1963-12-28 | 1964-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-28 | 1967-12-28 | 1968-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-28 | 1971-12-28 | 1972-06-28 | $7700.00 | Window Closed / Lapsed |