US2698833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling fluid composition and method
Assignee: Oil Base Inc
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Filing: 1952-08-25
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Granted: 1955-01-04
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Expires: 1972-08-25
Abstract
No abstract record available.
Inventors
- 👤 Doyne L Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:15
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/26; C09K8/28; Y; Y10; Y10S; Y10S507/00; Y10S507/905; Y10S507/907
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
AN EMULSION DRILLING FLUID WHEREIN THE OIL PHASE THEREOF COMPRISES A NONFLUORESCING MINERAL OIL THAT IS THERMALLY STABLE AGAINST APPRECIABLE DISCOLORATION THROUGH THE FORMATION THEREIN OF COLOR BODIES WHEN HEATED UNDER CONDITIONS OF USE, SAID OIL HAVING AN AROMATICS AND UNSATURATES CONTENT OF LESS THAN ABOUT 5%.
Claim 2
Dependent Claim
47 words
AN EMULSION DRILLING FLUID WHEREIN THE OIL PHASE THEREOF COMPRISES A NONFLUORESCING MINERAL OIL THAT IS THERMALLY STABLE AGAINST APPRECIABLE DISCOLORATION THROUGH THE FORMATION THEREIN OF COLOR BODIES WHEN HEATED UNDER CONDITIONS OF USE, SAID OIL HAVING AN AROMATICS AND UNSATURATES CONTENT OF LESS THAN ABOUT 5%.
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) | 1958-01-03 | 1958-07-05 | 1959-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-03 | 1962-07-05 | 1963-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-03 | 1966-07-05 | 1967-01-04 | $7700.00 | Window Closed / Lapsed |