US2901429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling fluids
Assignee: Lignosol Chemicals Ltd
•
Filing: 1956-04-17
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Granted: 1959-08-25
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Expires: 1976-04-17
Abstract
No abstract record available.
Inventors
- 👤 John K Russell
- 👤 Gerald J Byrd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:59
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/203
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A DRILLING FLUID COMPRISING BENTONITE AND PRETREATED SULPHITE LIQUOR MIXED IN AQUEOUS DISPERSION WITH SUB STANTIALLY 1 TO 2 POUNDS OF SODIUM HYDROXIDE AND SUBSTANTIALLY 2 TO 6 POUNDS OF CALCIUM HYDROXIDE PER BARREL OF THE MIXTURE SAID SULPHITE LIQUOR BEING THE PRODUCT FORMED BY AJUSTING THE PH OF WASTE SULPHITE LIQUOR TO 3.5-10.HEATING IT AT 125 TO 165* C. UNDER CORRESPONDING PRESSURE AND PASSING AIR INTO THE HOT LIQUOR AT THE RATE OF NOT LESS THAN TWO CUBIC FEED PER MINUTE PER CUBIC FOOT OF LIQUOR FOR ONE TO FOUR HOURS.
Claim 2
Dependent Claim
92 words
A DRILLING FLUID COMPRISING BENTONITE AND PRETREATED SULPHITE LIQUOR MIXED IN AQUEOUS DISPERSION WITH SUB STANTIALLY 1 TO 2 POUNDS OF SODIUM HYDROXIDE AND SUBSTANTIALLY 2 TO 6 POUNDS OF CALCIUM HYDROXIDE PER BARREL OF THE MIXTURE SAID SULPHITE LIQUOR BEING THE PRODUCT FORMED BY AJUSTING THE PH OF WASTE SULPHITE LIQUOR TO 3.5-10.HEATING IT AT 125 TO 165* C. UNDER CORRESPONDING PRESSURE AND PASSING AIR INTO THE HOT LIQUOR AT THE RATE OF NOT LESS THAN TWO CUBIC FEED PER MINUTE PER CUBIC FOOT OF LIQUOR FOR ONE TO FOUR HOURS.
References Cited (Backward Citations)
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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) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |