Patent US2691629A successfully refreshed from Google Patents.
US2691629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing material for porous formations
Assignee: California Research LLC
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Filing: 1951-03-13
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Granted: 1954-10-12
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Expires: 1971-03-13
Abstract
No abstract record available.
Inventors
- 👤 Robert A Stoner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:34
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/003; C; C09; C09K; C09K8/00; C09K8/50; C09K8/504; C09K8/5045
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A COMPOSITION OF MATTER FOR USE IN DRILLING OIL WELLS OR THE LIKE COMPRISING A DRILLING FLUID CONTAINING FINELY-DIVIDED SOLID MATERIAL IN LIQUID SUSPENSION AND COTTON SEEDS WITH THE NATURAL COTTON FIBERS ATTACHED THERETO IN A QUANTITY OF 0.5% BY WEIGHT OR MORE, SAID QUANTITY BEING SUFFICIENT TO RETARD THE FLOW OF FLUID IN CREVICES OR FISSURES IN EARTH FORMATIONS.
Claim 2
Dependent Claim
60 words
A COMPOSITION OF MATTER FOR USE IN DRILLING OIL WELLS OR THE LIKE COMPRISING A DRILLING FLUID CONTAINING FINELY-DIVIDED SOLID MATERIAL IN LIQUID SUSPENSION AND COTTON SEEDS WITH THE NATURAL COTTON FIBERS ATTACHED THERETO IN A QUANTITY OF 0.5% BY WEIGHT OR MORE, SAID QUANTITY BEING SUFFICIENT TO RETARD THE FLOW OF FLUID IN CREVICES OR FISSURES IN EARTH FORMATIONS.
References Cited (Backward Citations)
US2502191A
Cited
US2599745A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-11 | 1958-04-12 | 1958-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-11 | 1962-04-12 | 1962-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-11 | 1966-04-12 | 1966-10-12 | $7700.00 | Window Closed / Lapsed |