Patent US2841222A successfully refreshed from Google Patents.
US2841222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well treating process
Assignee: Union Oil Company of California
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Filing: 1956-10-08
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Granted: 1958-07-01
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Expires: 1976-10-08
Abstract
No abstract record available.
Inventors
- 👤 Gerould H Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:03
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/607; Y; Y10; Y10S; Y10S507/00; Y10S507/935
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A PROCESS FOR TREATING SUBTERRANEAN PERMEABLE FORMATIONS CONTAINING ARGILLACEOUS MATERIALS AND PENETRATED BY A BORE HOLE WHICH COMPRISES INTRODUCING THROUGH SAID BORE HOLE INTO SAID PERMEABLE FORMATION AN AQUEOUS SOLUTION OF AN ALKALINE EARTH METAL HALIDE COMPLEX WITH A NONIONIC SURFACTANT HAVING THE EMPIRICAL FORMULA
Claim 2
Dependent Claim
45 words
A PROCESS FOR TREATING SUBTERRANEAN PERMEABLE FORMATIONS CONTAINING ARGILLACEOUS MATERIALS AND PENETRATED BY A BORE HOLE WHICH COMPRISES INTRODUCING THROUGH SAID BORE HOLE INTO SAID PERMEABLE FORMATION AN AQUEOUS SOLUTION OF AN ALKALINE EARTH METAL HALIDE COMPLEX WITH A NONIONIC SURFACTANT HAVING THE EMPIRICAL FORMULA
References Cited (Backward Citations)
US2606151A
Cited
US2661334A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-30 | 1961-12-30 | 1962-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-30 | 1965-12-30 | 1966-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-30 | 1969-12-30 | 1970-07-01 | $7700.00 | Window Closed / Lapsed |