Patent US3021279A successfully refreshed from Google Patents.
US3021279A
Expired / Lapsed
US
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Method for the secondary recovery of oil
Assignee: Wyeth Holdings LLC
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Filing: 1959-07-31
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Granted: 1962-02-13
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Expires: 1979-07-31
Abstract
No abstract record available.
Inventors
- 👤 Clyde S Scanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:53
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/52; C09K8/528; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/30; C07F9/301; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A METHOD FOR THE SECONDARY RECOVERY OF OIL FROM A SUBTERRANEAN OIL-BEARING LIMESTONE-CONTAINING FORMATION WHICH COMPRISES FORCING THROUGH SAID FORMATION TOWARD AN OUTPUT WELL LOCATED THEREIN AN AQUEOUS FLOODING LIQUID CONTAMINATED BY SMALL QUANTITIES OFDISSOLVED IRON AND RENDERED ALKALINE BY CONTACT WITH SAID LIMESTONE, SAID RENDERED ALKALINE BY CONTACT WITH SAID LIMESTONE, SAID ABOUT ONE-FIFTEENTH MOL TO ONE MOL FOR EACH MOL OF IRON PREAENT, A COMPOUND SELECTED FROM THE GROUP CONSISTING OF BIS-(1-CARBOXY-1-HYDROXY-1-ALKYL) PHOSPHINIC ACID AND WATER-SOLUBLE SALTS THEREOF WHEREBY PRECIPITATION OF SAID IRON IN THE FORMATION IS AVOIDED.
Claim 2
Independent Claim
90 words
A METHOD FOR THE SECONDARY RECOVERY OF OIL FROM A SUBTERRANEAN OIL-BEARING LIMESTONE-CONTAINING FORMATION WHICH COMPRISES FORCING THROUGH SAID FORMATION TOWARD AN OUTPUT WELL LOCATED THEREIN AN AQUEOUS FLOODING LIQUID CONTAMINATED BY SMALL QUANTITIES OFDISSOLVED IRON AND RENDERED ALKALINE BY CONTACT WITH SAID LIMESTONE, SAID RENDERED ALKALINE BY CONTACT WITH SAID LIMESTONE, SAID ABOUT ONE-FIFTEENTH MOL TO ONE MOL FOR EACH MOL OF IRON PREAENT, A COMPOUND SELECTED FROM THE GROUP CONSISTING OF BIS-(1-CARBOXY-1-HYDROXY-1-ALKYL) PHOSPHINIC ACID AND WATER-SOLUBLE SALTS THEREOF WHEREBY PRECIPITATION OF SAID IRON IN THE FORMATION IS AVOIDED.
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) | 1965-02-12 | 1965-08-14 | 1966-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-12 | 1969-08-14 | 1970-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-12 | 1973-08-14 | 1974-02-13 | $7700.00 | Window Closed / Lapsed |