Patent US2815323A successfully refreshed from Google Patents.
US2815323A
Expired / Lapsed
US
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Treatment of drilling fluids
Assignee: Phillips Petroleum Co
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Filing: 1956-06-22
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Granted: 1957-12-03
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Expires: 1976-06-22
Abstract
No abstract record available.
Inventors
- 👤 Ralph P Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:01
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
A DRILLING FLUID COMPRISING AN AQUEOUS SUSPENSION OF INORGANIC SOLIDS, AMYLACEOUS-COLLOID MATERIAL, AND A MINOR AMOUNT OF A COMPOUND SUFFICIENT TO INHIBIT THE DEGRADATION OF SAID MATERIAL, SAID COMPOUND HAVING A GENERAL FORMULA REPRESENTED DIAGRAMMATICALLY AS FOLLOWS:
Claim 2
Dependent Claim
37 words
A DRILLING FLUID COMPRISING AN AQUEOUS SUSPENSION OF INORGANIC SOLIDS, AMYLACEOUS-COLLOID MATERIAL, AND A MINOR AMOUNT OF A COMPOUND SUFFICIENT TO INHIBIT THE DEGRADATION OF SAID MATERIAL, SAID COMPOUND HAVING A GENERAL FORMULA REPRESENTED DIAGRAMMATICALLY AS FOLLOWS:
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) | 1960-12-02 | 1961-06-03 | 1961-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-02 | 1965-06-03 | 1965-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-02 | 1969-06-03 | 1969-12-03 | $7700.00 | Window Closed / Lapsed |