Patent US5012300A successfully refreshed from Google Patents.
US2793995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fibrous sealing composition for porous formations and method for making the same
Assignee: Individual
•
Filing: 1953-12-15
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Granted: 1957-05-28
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Expires: 1973-12-15
Abstract
No abstract record available.
Inventors
- 👤 Homer L Twinging
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:30
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A PROCESS OF PRODUCTING A SEALING ADDITIVE COMPOSED OF DELIGNIFIED, FLEXIBLE AND TOUGH WOOD FIBERS FOR DRILLING DLUIDS WHICH COMPRISES TREATING WOOD, WHILE IN THE FORM OF BODIES OF UNSEPARATED FIBERS, SAID BODIES BEING OF SUCH SIZE AS TO PRODUCE FIBERS HAVING A LENGTH OF FROM 1/4 INCH TO ABOUT 4 INCHES, WITH AN AGENT TO REMOVE LIGNIN FROM THE CELLULAR STRUCTURE THEREOF, RINSING SAID BODIES TO REMOVE THE TREATI-NG AGENT THEREFTOM, SHREDDING THE DELIGNIFIED WOOD BODIES TO THEREBY REDUCE THE SAME TO A MASS OF LOOSE FIBERS FOR USE AS AN ADDITIVE.
Claim 2
Dependent Claim
93 words
A PROCESS OF PRODUCTING A SEALING ADDITIVE COMPOSED OF DELIGNIFIED, FLEXIBLE AND TOUGH WOOD FIBERS FOR DRILLING DLUIDS WHICH COMPRISES TREATING WOOD, WHILE IN THE FORM OF BODIES OF UNSEPARATED FIBERS, SAID BODIES BEING OF SUCH SIZE AS TO PRODUCE FIBERS HAVING A LENGTH OF FROM 1/4 INCH TO ABOUT 4 INCHES, WITH AN AGENT TO REMOVE LIGNIN FROM THE CELLULAR STRUCTURE THEREOF, RINSING SAID BODIES TO REMOVE THE TREATI-NG AGENT THEREFTOM, SHREDDING THE DELIGNIFIED WOOD BODIES TO THEREBY REDUCE THE SAME TO A MASS OF LOOSE FIBERS FOR USE AS AN ADDITIVE.
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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) | 1960-05-27 | 1960-11-26 | 1961-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-27 | 1964-11-26 | 1965-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-27 | 1968-11-26 | 1969-05-28 | $7700.00 | Window Closed / Lapsed |