Patent US2674575A successfully refreshed from Google Patents.
US2674575A
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Well drilling composition
Assignee: Pacific Lumber Co
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Filing: 1951-03-16
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Granted: 1954-04-06
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Expires: 1971-03-16
Abstract
No abstract record available.
Inventors
- 👤 Harry F Lewis
- 👤 Marion A Buchanan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:59
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/203; Y; Y10; Y10S; Y10S206/00; Y10S206/819
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
AN AQUEOUS DRILLING MUD MADE UP OF A MAJOR PROPORTION OF WATER INSOLUBLE CLAY MATERIAL AND CHARACTERIZED BY THE PRESENCE OF A MINOR PROPORTION OF ALKALI METAL SULFITE-DIGESTED REDWOOD BARK SOLUBLES SUFFICIENT TO REDUCE THE VISCOSITY, GEL-STRENGTH AND/OR WATER LOSSES OF SAID AQUEOUS DRILLING MUD.
Claim 2
Dependent Claim
45 words
AN AQUEOUS DRILLING MUD MADE UP OF A MAJOR PROPORTION OF WATER INSOLUBLE CLAY MATERIAL AND CHARACTERIZED BY THE PRESENCE OF A MINOR PROPORTION OF ALKALI METAL SULFITE-DIGESTED REDWOOD BARK SOLUBLES SUFFICIENT TO REDUCE THE VISCOSITY, GEL-STRENGTH AND/OR WATER LOSSES OF SAID AQUEOUS DRILLING MUD.
References Cited (Backward Citations)
US2549142A
Cited
US2491437A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-05 | 1957-10-05 | 1958-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-05 | 1961-10-05 | 1962-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-05 | 1965-10-05 | 1966-04-06 | $7700.00 | Window Closed / Lapsed |