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Patent US2680595A successfully refreshed from Google Patents.
US2680595A
Expired / Lapsed
US
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Method of sealing off porous formations in boreholes
Assignee: Phillips Petroleum Co
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Filing: 1952-09-22
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Granted: 1954-06-08
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Expires: 1972-09-22
Abstract
No abstract record available.
Inventors
- 👤 John D Upham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:55
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/138; Y; Y10; Y10S; Y10S507/00; Y10S507/925
Claims Analysis
Total Claims: 0
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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) | 1957-06-07 | 1957-12-07 | 1958-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-07 | 1961-12-07 | 1962-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-07 | 1965-12-07 | 1966-06-08 | $7700.00 | Window Closed / Lapsed |