Patent US2846390A successfully refreshed from Google Patents.
US2846390A
Expired / Lapsed
US
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Process for recovering lost circulation
Assignee: Pan American Petroleum Corp
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Filing: 1954-05-03
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Granted: 1958-08-05
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Expires: 1974-05-03
Abstract
No abstract record available.
Inventors
- 👤 James L Lummus
- 👤 Jr Robert P Murphy
- 👤 Jr Platho P Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:52
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/50; C09K8/516; C09K2208/00; C09K2208/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
IN A PROCESS FOR DRILLING A WELL WHEREIN AN AQUEOUS DRILLING FLUID IS CIRCULATED IN SAID WELL, THE METHOD OF RECOVERING LOST CIRCULATION WHICH COMPRISES ADMIXING WITH SAID DRILLING FLUID GROUND WOODEN PARTICLES, SAID PARTICLES HAVING SIZES THROUGHOUT THE RANGE -4 TO +100 MESH AND BEING WATERPROOFED BY RESIN IMPREGNATION PRIOR TO GRINDING.
Claim 2
Dependent Claim
53 words
IN A PROCESS FOR DRILLING A WELL WHEREIN AN AQUEOUS DRILLING FLUID IS CIRCULATED IN SAID WELL, THE METHOD OF RECOVERING LOST CIRCULATION WHICH COMPRISES ADMIXING WITH SAID DRILLING FLUID GROUND WOODEN PARTICLES, SAID PARTICLES HAVING SIZES THROUGHOUT THE RANGE -4 TO +100 MESH AND BEING WATERPROOFED BY RESIN IMPREGNATION PRIOR TO GRINDING.
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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) | 1961-08-04 | 1962-02-03 | 1962-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-04 | 1966-02-03 | 1966-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-04 | 1970-02-03 | 1970-08-05 | $7700.00 | Window Closed / Lapsed |