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US3258071A
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Secondary hydrocarbon recovery process
Assignee: Monsanto Co
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Filing: 1962-09-19
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Granted: 1966-06-28
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Expires: 1982-09-19
Abstract
No abstract record available.
Inventors
- 👤 Shen Chung Yu
- 👤 Jr Darwin A Novak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:31
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/52; C09K8/528; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
IN A PROCESS OF RECOVERING HYDROCARBONS FROM A SUBTERRANEAN, OIL-WET FORMATION CONTAINING HYDROCARBONS BY MEANS OF A WATER FLOODING OPERATION THE IMPROVEMENT WHICH COMPRISES INJECTING INTO SAID OIL-WET FORMATION A WATER FLOODING MEDIUM HAVING A PH IN THE RANGE OF ABOUT 5 TO 9 AND CONTAINING AN AMOUNT OF ALKALI TRIMETAPHOSPHATE SUFFICIENT TO CHANGE THE OIL-WET FORMATION TO A WATERWET FORMATION BY THE PASSAGE OF SAID MEDIUM THROUGH SAID FORMATION.
Claim 2
Dependent Claim
70 words
IN A PROCESS OF RECOVERING HYDROCARBONS FROM A SUBTERRANEAN, OIL-WET FORMATION CONTAINING HYDROCARBONS BY MEANS OF A WATER FLOODING OPERATION THE IMPROVEMENT WHICH COMPRISES INJECTING INTO SAID OIL-WET FORMATION A WATER FLOODING MEDIUM HAVING A PH IN THE RANGE OF ABOUT 5 TO 9 AND CONTAINING AN AMOUNT OF ALKALI TRIMETAPHOSPHATE SUFFICIENT TO CHANGE THE OIL-WET FORMATION TO A WATERWET FORMATION BY THE PASSAGE OF SAID MEDIUM THROUGH 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) | 1969-06-27 | 1969-12-27 | 1970-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-27 | 1973-12-27 | 1974-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $7700.00 | Window Closed / Lapsed |