Patent US2675353A successfully refreshed from Google Patents.
US2675353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil base drilling fluid
Assignee: Shell Development Co
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Filing: 1950-10-20
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Granted: 1954-04-13
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Expires: 1970-10-20
Abstract
No abstract record available.
Inventors
- 👤 Reginald D Dawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:54
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
AN OIL-CONTAINING DRILLING FLUID FOR WELLS, COMPRISING A SUBSTANTIAL QUANTITY OF A MINERAL OIL, A FINELY DIVIDED SOLID MATERIAL DISPERSED IN SAID FLUID FOR WEIGHTING SAID FLUID TO AT LEAST 75 LBS. PER CU. FT., AND A MINOR AMOUNT OF A TETRAALKYL AMMONIUM HALIDE HAVING AT LEAST ONE OF THE ALKYL RADICALS WITH A CHAIN LENGTH OF AT LEAST 12 CARBON ATOMS, SAID MINOR AMOUNT BEING SUFFICIENT TO STABILIZE THE DRILLING FLUID AND MAINTAIN IT AT A DRILLING VISCOSITY.
Claim 2
Dependent Claim
79 words
AN OIL-CONTAINING DRILLING FLUID FOR WELLS, COMPRISING A SUBSTANTIAL QUANTITY OF A MINERAL OIL, A FINELY DIVIDED SOLID MATERIAL DISPERSED IN SAID FLUID FOR WEIGHTING SAID FLUID TO AT LEAST 75 LBS. PER CU. FT., AND A MINOR AMOUNT OF A TETRAALKYL AMMONIUM HALIDE HAVING AT LEAST ONE OF THE ALKYL RADICALS WITH A CHAIN LENGTH OF AT LEAST 12 CARBON ATOMS, SAID MINOR AMOUNT BEING SUFFICIENT TO STABILIZE THE DRILLING FLUID AND MAINTAIN IT AT A DRILLING VISCOSITY.
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) | 1957-04-12 | 1957-10-12 | 1958-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-12 | 1961-10-12 | 1962-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-12 | 1965-10-12 | 1966-04-13 | $7700.00 | Window Closed / Lapsed |