Patent US2919898A successfully refreshed from Google Patents.
US2919898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of well drilling mud
Assignee: Phillips Petroleum Co
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Filing: 1957-08-16
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Granted: 1960-01-05
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Expires: 1977-08-16
Abstract
No abstract record available.
Inventors
- 👤 Stanley J Marwil
- 👤 Charles J Engle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:28
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/06; E21B21/063; E21B21/065
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
THE PROCESS OF TREATING A WELL DRILLING MUD COMPRISING COARSE SAND, WEIGHTING AGENT, FINE SAND, AND CLAY, SUSPENDED IN A LIQUID MEDIUM COMPRISING THE STEPS OF CENTRIFUGALLY SEPARATING AND DISCARDING A CONCENTRATION OF SAID COARSE SAND FROM SAID MUD, CENTRIFUGALLY SEPARATING AND PERSERVING A CONCENTRATION OF SAID WEIGHTING AGENT FROM THE THEN REMAINING PORTION OF SAID MUD, CENTRIFUGALLY SEPARATING AND DISCARDING A CONCENTRATION OF SAID FINE SAND AND CLAY FROM THE THEN REMAINING PORTION OF SAID MUD AND COMBINING SAID LAST THEN REMAINING PORTION OF SAID MUD WITH SAID CONCENTRATION OF WEIGHTING AGENT TO FORM A TREATED MUD.
Claim 2
Dependent Claim
98 words
THE PROCESS OF TREATING A WELL DRILLING MUD COMPRISING COARSE SAND, WEIGHTING AGENT, FINE SAND, AND CLAY, SUSPENDED IN A LIQUID MEDIUM COMPRISING THE STEPS OF CENTRIFUGALLY SEPARATING AND DISCARDING A CONCENTRATION OF SAID COARSE SAND FROM SAID MUD, CENTRIFUGALLY SEPARATING AND PERSERVING A CONCENTRATION OF SAID WEIGHTING AGENT FROM THE THEN REMAINING PORTION OF SAID MUD, CENTRIFUGALLY SEPARATING AND DISCARDING A CONCENTRATION OF SAID FINE SAND AND CLAY FROM THE THEN REMAINING PORTION OF SAID MUD AND COMBINING SAID LAST THEN REMAINING PORTION OF SAID MUD WITH SAID CONCENTRATION OF WEIGHTING AGENT TO FORM A TREATED MUD.
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) | 1963-01-04 | 1963-07-06 | 1964-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-04 | 1967-07-06 | 1968-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-04 | 1971-07-06 | 1972-01-05 | $7700.00 | Window Closed / Lapsed |