US2870990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling fluid method
Assignee: Individual
•
Filing: 1955-03-02
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Granted: 1959-01-27
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Expires: 1975-03-02
Abstract
No abstract record available.
Inventors
- 👤 Taylor G Bergey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:37
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/06; E21B21/063; E21B21/065
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A METHOD OF TREATING OIL, GAS AND SULPHUR WELL DRILLING FLUID CONTAINING SUSPENDED SOLIDS AND WEIGHTING MATERAIL OF GREATER DENSITY THAN THE SUSPENDED SOLIDS TO RECOVER THE WEIGHTING MATERIAL AND TO PRODUCE AN EFFLUENT SUITABLE FOR REUSE IN DRILLING FLUID COMPRISING, SEPARATING AT LEAST PARTICALLY THE WEIGHTING MATERIAL FROM THE DRILLING FLUID, CENTRIFUGING THE REMAINING DRILLING FLUID BY A CENTRIFUGAL, FORCE SUFFICIENT TO SEPARATE ENOUGH SUSPENDED SOLIDS FROM THE DRILLING FLUID TO PRODUCE AN EFFLUENT WHICH
Claim 2
Independent Claim
76 words
A METHOD OF TREATING OIL, GAS AND SULPHUR WELL DRILLING FLUID CONTAINING SUSPENDED SOLIDS AND WEIGHTING MATERAIL OF GREATER DENSITY THAN THE SUSPENDED SOLIDS TO RECOVER THE WEIGHTING MATERIAL AND TO PRODUCE AN EFFLUENT SUITABLE FOR REUSE IN DRILLING FLUID COMPRISING, SEPARATING AT LEAST PARTICALLY THE WEIGHTING MATERIAL FROM THE DRILLING FLUID, CENTRIFUGING THE REMAINING DRILLING FLUID BY A CENTRIFUGAL, FORCE SUFFICIENT TO SEPARATE ENOUGH SUSPENDED SOLIDS FROM THE DRILLING FLUID TO PRODUCE AN EFFLUENT WHICH
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) | 1962-01-26 | 1962-07-28 | 1963-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-26 | 1966-07-28 | 1967-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-26 | 1970-07-28 | 1971-01-27 | $7700.00 | Window Closed / Lapsed |