US2960464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling fluid
Assignee: Texaco Inc
•
Filing: 1957-07-08
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Granted: 1960-11-15
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Expires: 1977-07-08
Abstract
No abstract record available.
Inventors
- 👤 Walter J Weiss
- 👤 Richard H Graves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:07
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/26; C09K8/28; C09K8/14; C09K8/18; C09K8/20; C09K8/203
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
108 words
IN THE DRILLING OF A BORE HOLE THROUGH A HEAVING SALE FORMATION WHEREIN A DRILLING FLUID IS PASSED THROUGH THE BORE HOLE IN CONTACT WITH THE HEAVING SHALE FORMATION DURING THE DRILLING OPERATION THE IMPROVEMENT WHICH COMPRISES ADDING LIME AND AMMONIUM LIGNOSULFONATE TO WATER, PERMITTING THE THUS-ADDED LIME AND AMMONIUM LIGNOSULFONATE TO UNDERGO METATHETICAL REACTION THEREIN WITH THE RESULTING FORMATION OF CALCIUM LIGNOSULFONATE AND AMMONIUM HYDROXIDE TO YIELD A RESULTING ALKALINE AQUEOUS PHASE HAVING A PH NOT IN EXCESSD OF 12.6 AND A CALCIUM ION CONCENTRATION IN EXCESS OF 200 PARTS PER MILLION BY WEIGHT AND CONTACTING SAID FORMATION WITH SAID RESULTING AQUEOUS PHASE AS SAID DRILLING FLUID.
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) | 1963-11-15 | 1964-05-16 | 1964-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-15 | 1968-05-16 | 1968-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-15 | 1972-05-16 | 1972-11-15 | $7700.00 | Window Closed / Lapsed |