Patent US5225984A successfully refreshed from Google Patents.
Patent US2498301A successfully refreshed from Google Patents.
US2498301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of drilling fluids
Assignee: Oil Well Chemical and Materials Co
•
Filing: 1948-04-07
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Granted: 1950-02-21
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Expires: 1968-04-07
Abstract
No abstract record available.
Inventors
- 👤 Self Edward Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:10
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
49 words
THE PROCESS OF INCREASING THE RESISTANCE OF A DRILLING FLUID TO THE DETERIORATION CAUSED BY DRILLING THROUGH BEDS OF GYPSUM COMPRISING ADDING FROM 1/2 TO 3 LBS. PER BARREL OF SODIUM CARBOXYL METHYL CELLULOSE AND FROM 5 TO 20 LBS. PER BARREL OF SODIUM RESINATE TO SAID DRILLING FLUID.
Claim 2
Dependent Claim
49 words
THE PROCESS OF INCREASING THE RESISTANCE OF A DRILLING FLUID TO THE DETERIORATION CAUSED BY DRILLING THROUGH BEDS OF GYPSUM COMPRISING ADDING FROM 1/2 TO 3 LBS. PER BARREL OF SODIUM CARBOXYL METHYL CELLULOSE AND FROM 5 TO 20 LBS. PER BARREL OF SODIUM RESINATE TO SAID DRILLING FLUID.
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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) | 1953-02-20 | 1953-08-22 | 1954-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-20 | 1957-08-22 | 1958-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-20 | 1961-08-22 | 1962-02-21 | $7700.00 | Window Closed / Lapsed |