US2858271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well drilling fluids and method of making the same
Assignee: LIGNOSAL CHEMICALS Ltd
•
Filing: 1956-09-07
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Granted: 1958-10-28
•
Expires: 1976-09-07
Abstract
No abstract record available.
Inventors
- 👤 Gerald J Byrd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:04
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
124 words
A WELL DRILLING FLUID CONSISTING ESSENTIALLY OF AN AQUEOUS CLAY SLURRY HAVING INCORPORATED THEREIN BY AGITATION SUBSTANTIALLY 5 POUNDS OF CALCIUM HYDROXIDE AND 2 POUNDS OF SOLIUM HYDROXIDE PER BARREL OF SLURRY, AND AT LEAST 1 POUND PER BARREL OF DRIED SODIUM BASE SULPHITE LIQUOR MATERIAL, SAID MATERIAL HAVING BEEN OBTAINED BY A METHOD COMPRISING HEATING SODIUM BASE SULPHITE LIQUOR HAVING A PH OF ABOUT 7 IN A CLOSED ZONE AT A TEMPERATURE OF 270 TO 300*F., PASSING AIR INTO THE HOT LIQUOR TO OXIDIZE THE MATERIAL AND REDUCE ITS PH TO 4-4.5, MIXING WITH THE LIQUOR NOT SUBSTANTIALLY LESS THAN 5% NOT MORE THAN 25% OF ITS SOLIDS CONTENT OF ALKALI METAL DICHROMATE AND PROMPTLY SPRAY DRYING THE MIXTURE TO AVOID GEL FORMATION.
Claim 2
Dependent Claim
124 words
A WELL DRILLING FLUID CONSISTING ESSENTIALLY OF AN AQUEOUS CLAY SLURRY HAVING INCORPORATED THEREIN BY AGITATION SUBSTANTIALLY 5 POUNDS OF CALCIUM HYDROXIDE AND 2 POUNDS OF SOLIUM HYDROXIDE PER BARREL OF SLURRY, AND AT LEAST 1 POUND PER BARREL OF DRIED SODIUM BASE SULPHITE LIQUOR MATERIAL, SAID MATERIAL HAVING BEEN OBTAINED BY A METHOD COMPRISING HEATING SODIUM BASE SULPHITE LIQUOR HAVING A PH OF ABOUT 7 IN A CLOSED ZONE AT A TEMPERATURE OF 270 TO 300*F., PASSING AIR INTO THE HOT LIQUOR TO OXIDIZE THE MATERIAL AND REDUCE ITS PH TO 4-4.5, MIXING WITH THE LIQUOR NOT SUBSTANTIALLY LESS THAN 5% NOT MORE THAN 25% OF ITS SOLIDS CONTENT OF ALKALI METAL DICHROMATE AND PROMPTLY SPRAY DRYING THE MIXTURE TO AVOID GEL FORMATION.
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) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |