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Patent US2869642A successfully refreshed from Google Patents.
US2869642A
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Method of treating subsurface formations
Assignee: Texaco Inc
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Filing: 1954-09-14
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Granted: 1959-01-20
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Expires: 1974-09-14
Abstract
No abstract record available.
Inventors
- 👤 Alexander S Mckay
- 👤 Edmond F Egan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:57
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/72; E; E21; E21B; E21B43/00; E21B43/25; E21B47/00; E21B47/10; E21B47/11; E21B47/111
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2259429A
Cited
US2450265A
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US2524933A
Cited
US2676662A
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US2596843A
Cited
US2700734A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |