Patent US3325974A successfully refreshed from Google Patents.
US3325974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling mud degassers for oil wells
Assignee: Bass Brothers Enterprises Inc
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Filing: 1965-09-07
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Granted: 1967-06-20
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Expires: 1985-09-07
Abstract
No abstract record available.
Inventors
- 👤 Iii Phil H Griffin
- 👤 Jr John W Melton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:52
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/06; E21B21/063; E21B21/067
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
IN A MUD DEGASSER APPARATUS, THE COMBINATION OF A DEGASSER VACUUM TANK HAVING A MUD INLET AND MUD OUTLET, A MECHANICAL VACUUM-ACTUATED MUD PUMP MEANS CONNECTED TO SAID MUD OUTLET FOR DRAWING MUD FROM SAID INLET THROUGH SAID TANK, AN AIR PUMP HAVING AN INTAKE COMMUNICATING WITH SAID TANK FOR MAINTAINING THE INTERIOR THEREOF AT SUB-ATMOSPHERIC PRESSURE, AND MEANS FOR RESPECTIVELY DECREASING AND INCREASING SAID PRESSURE IN RESPONSE TO LOWERING AND RISING OF MUD LEVEL IN THE TANK, SAID MECHANICAL VACUUM-ACTUATED MUD PUMP MEANS ALSO BEING CONNECTED TO THE INTAKE OF SAID AIR PUMP, SO THAT THE MUD PUMP MEANS IS ACTUATED ONLY WHEN SAID PRESSURE IN THE TANK IS HIGHER THAN THAT IN THE MUD PUMP MEANS, FOR MAINTAINING THE MUD LEVEL AND PRESSURE IN THE TANK SUBSTANTIALLY CONSTANT.
Claim 2
Dependent Claim
130 words
IN A MUD DEGASSER APPARATUS, THE COMBINATION OF A DEGASSER VACUUM TANK HAVING A MUD INLET AND MUD OUTLET, A MECHANICAL VACUUM-ACTUATED MUD PUMP MEANS CONNECTED TO SAID MUD OUTLET FOR DRAWING MUD FROM SAID INLET THROUGH SAID TANK, AN AIR PUMP HAVING AN INTAKE COMMUNICATING WITH SAID TANK FOR MAINTAINING THE INTERIOR THEREOF AT SUB-ATMOSPHERIC PRESSURE, AND MEANS FOR RESPECTIVELY DECREASING AND INCREASING SAID PRESSURE IN RESPONSE TO LOWERING AND RISING OF MUD LEVEL IN THE TANK, SAID MECHANICAL VACUUM-ACTUATED MUD PUMP MEANS ALSO BEING CONNECTED TO THE INTAKE OF SAID AIR PUMP, SO THAT THE MUD PUMP MEANS IS ACTUATED ONLY WHEN SAID PRESSURE IN THE TANK IS HIGHER THAN THAT IN THE MUD PUMP MEANS, FOR MAINTAINING THE MUD LEVEL AND PRESSURE IN THE TANK SUBSTANTIALLY CONSTANT.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-06-19 | 1970-12-19 | 1971-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-19 | 1974-12-19 | 1975-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-19 | 1978-12-19 | 1979-06-20 | $7700.00 | Window Closed / Lapsed |