Patent US2990881A successfully refreshed from Google Patents.
US2990881A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treating permeable underground formations
Assignee: Texaco Inc
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Filing: 1957-12-03
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Granted: 1961-07-04
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Expires: 1977-12-03
Abstract
No abstract record available.
Inventors
- 👤 Charles C Nathan
- 👤 Reeves B Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:16
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/50; C09K8/504; C09K8/5045; C09K17/00; C09K17/40; C09K17/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A METHOD OF TREATING A PERMEABLE UNDERGROUND FORMATION TO REDUCE THE POROSITY THEREOF WHICH COMPRISES INTRODUCING INTO SAID FORMATION AN AQUEOUS SOLUTION COMPRISING A METAL COMPOUND, THE SULFIDE OF WHICH METAL IS WATER INSOLUBLE, AND A THIOAMIDE, RETAINING THE THUS INTRODUCED SOLUTION WITHIN SAID FORMATION IN CONTACT THEREWITH HYDROLYZING THE THUS-INJECTED THIOAMIDE IN SAID SOLUTION TO FORM HYDROGEN SULFIDE WHEREBY THE METAL SULFIDE OF THE SAID METAL IS FORMED AND PRECIPITATED IN SITU WITHIN SAID FORMATION.
Claim 2
Independent Claim
76 words
A METHOD OF TREATING A PERMEABLE UNDERGROUND FORMATION TO REDUCE THE POROSITY THEREOF WHICH COMPRISES INTRODUCING INTO SAID FORMATION AN AQUEOUS SOLUTION COMPRISING A METAL COMPOUND, THE SULFIDE OF WHICH METAL IS WATER INSOLUBLE, AND A THIOAMIDE, RETAINING THE THUS INTRODUCED SOLUTION WITHIN SAID FORMATION IN CONTACT THEREWITH HYDROLYZING THE THUS-INJECTED THIOAMIDE IN SAID SOLUTION TO FORM HYDROGEN SULFIDE WHEREBY THE METAL SULFIDE OF THE SAID METAL IS FORMED AND PRECIPITATED IN SITU WITHIN SAID FORMATION.
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) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |