Patent US2923681A successfully refreshed from Google Patents.
US2923681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling fluids and compositions for use in modification of same
Assignee: Individual
•
Filing: 1954-04-23
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Granted: 1960-02-02
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Expires: 1974-04-23
Abstract
No abstract record available.
Inventors
- 👤 Kenneth L Hein
- 👤 David L Lindsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:18
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/06; C09K8/12; C09K8/14; C09K8/18; C09K8/22; C09K8/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A COMPOSITION FOR STABILIZATION OF A DRILLING MUD CALCULATED IN AMOUNTS PER BARREL OF MUD, CONSISTING ESSENTIALLY OF .5-3 POUNDS OF A WATER SOLUBLE POLYACRYLATE RESIN, 1.5-3 POUNDS OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF QUEBRACHO, TANNIC ACID, TANNINS, VEGETABLE EXTRACTS RICH IN TANNIN AND LIGNITE, 2-6 POUNDS OF AN ALKALI METAL CARBONATE.
Claim 2
Dependent Claim
55 words
A COMPOSITION FOR STABILIZATION OF A DRILLING MUD CALCULATED IN AMOUNTS PER BARREL OF MUD, CONSISTING ESSENTIALLY OF .5-3 POUNDS OF A WATER SOLUBLE POLYACRYLATE RESIN, 1.5-3 POUNDS OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF QUEBRACHO, TANNIC ACID, TANNINS, VEGETABLE EXTRACTS RICH IN TANNIN AND LIGNITE, 2-6 POUNDS OF AN ALKALI METAL CARBONATE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-01 | 1963-08-03 | 1964-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-01 | 1967-08-03 | 1968-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-01 | 1971-08-03 | 1972-02-02 | $7700.00 | Window Closed / Lapsed |