US3658701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling fluid
Assignee: MI Drilling Fluids Co
•
Filing: 1968-12-09
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Granted: 1972-04-25
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Expires: 1988-12-09
Abstract
Abstract Oil base drilling fluids which contain a metal oxide such as manganese oxide as a high temperature fluid loss control agent.
Inventors
- 👤 Raymond E Mcglothlin
- 👤 James C Baggett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:04
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/32; C09K8/36; C08; C08L; C08L95/00; C08L95/005; Y; Y10; Y10S; Y10S507/00; Y10S507/91
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
14 words
The additive according to claim 1 wherein said asphaltic material is the bitumen Gilsonite.
References Cited (Backward Citations)
US1575945A
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US2497398A
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US2862881A
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US2779735A
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US2943051A
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US2946746A
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US3021277A
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US3046222A
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US3107349A
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US3041275A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |