Patent US2515207A successfully refreshed from Google Patents.
US2515207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling mud clay
Assignee: Phillips Petroleum Co
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Filing: 1948-01-05
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Granted: 1950-07-18
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Expires: 1968-01-05
Abstract
No abstract record available.
Inventors
- 👤 Henry B Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:51
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/145; Y; Y10; Y10S; Y10S507/00; Y10S507/904
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
THE METHOD OF TREATING BENTONITE TO STABILIZE ITS EFFECT ON THE VISCOSITY OF WATER BASE WELL DRILLING MUD WHICH COMPRISES DISPERSING SAID BENTONITE IN AN ALKALI METAL HYDROXIDE SOLUTION HAVING AN ALKALI CONCENTRATION OF 0.25 TO 10 WEIGHT PER CENT, AND HEATING THE SOLUTION TO BETWEEN 95*C. AND 200*C. FOR A MINIMUM TIME OF 24 HOURS FOR 95*C. AND 0.25 WEIGHT PER CENT CAUSTIC AND ONE-HALF HOUR FOR 200*C. AND 10 WEIGHT PER CENT CAUSTIC, AND WITH A PROPORTIONAL MINIMUM TIME FOR INTERMEDIATE TEMPERATURE AND CAUSTIC CONCENTRATIONS.
Claim 2
Independent Claim
87 words
THE METHOD OF TREATING BENTONITE TO STABILIZE ITS EFFECT ON THE VISCOSITY OF WATER BASE WELL DRILLING MUD WHICH COMPRISES DISPERSING SAID BENTONITE IN AN ALKALI METAL HYDROXIDE SOLUTION HAVING AN ALKALI CONCENTRATION OF 0.25 TO 10 WEIGHT PER CENT, AND HEATING THE SOLUTION TO BETWEEN 95*C. AND 200*C. FOR A MINIMUM TIME OF 24 HOURS FOR 95*C. AND 0.25 WEIGHT PER CENT CAUSTIC AND ONE-HALF HOUR FOR 200*C. AND 10 WEIGHT PER CENT CAUSTIC, AND WITH A PROPORTIONAL MINIMUM TIME FOR INTERMEDIATE TEMPERATURE AND CAUSTIC CONCENTRATIONS.
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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) | 1953-07-17 | 1954-01-16 | 1954-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-17 | 1958-01-16 | 1958-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-17 | 1962-01-16 | 1962-07-18 | $7700.00 | Window Closed / Lapsed |