US2912380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling fluids and method of preventing loss thereof from well holes
Assignee: Akzo Nobel UK PLC
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Filing: 1953-07-17
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Granted: 1959-11-10
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Expires: 1973-07-17
Abstract
No abstract record available.
Inventors
- 👤 Groves Kenneth Deane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:16
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
A COMPOSITION FOR SEALING PERMEABLE FORMATIONS ENCOUNTERED IN THE DRILLING OF A WELL COMPRISING A WELL MUD FLUID TO WHICH HAS BEEN ADDED HYDROPHILIC CELLULOSIC FIBERS AND GRANULES OF A THERMOPLASTIC CELLULOSE ESTER HAVING HYDROPHILIC CELLULOSIC FIBERS PARTIALLY IMBEDDED THEREIN.
Claim 2
Dependent Claim
40 words
A COMPOSITION FOR SEALING PERMEABLE FORMATIONS ENCOUNTERED IN THE DRILLING OF A WELL COMPRISING A WELL MUD FLUID TO WHICH HAS BEEN ADDED HYDROPHILIC CELLULOSIC FIBERS AND GRANULES OF A THERMOPLASTIC CELLULOSE ESTER HAVING HYDROPHILIC CELLULOSIC FIBERS PARTIALLY IMBEDDED THEREIN.
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) | 1962-11-09 | 1963-05-11 | 1963-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-09 | 1967-05-11 | 1967-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-09 | 1971-05-11 | 1971-11-10 | $7700.00 | Window Closed / Lapsed |