US2842492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for increasing the yield of oil upon the flooding with water of oil deposits
Assignee: Gewerkschaft Elwerath
•
Filing: 1955-03-02
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Granted: 1958-07-08
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Expires: 1975-03-02
Abstract
No abstract record available.
Inventors
- 👤 Engelhardt Wolf Von
- 👤 Trommsdorff Ernst
- 👤 Tunn Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:46
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/04; C08F220/06; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A PROCESS FOR INCREASING THE YIELD OF OIL UPON FLOODING OIL DEPOSITS WITH WATER COMPRISING FLOODING OIL DEPOSITS WITH WATER CONTAINING A VISCOSITY IMPROVER HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 600,000 SELECTED FROM THE GROUP CONSISTING OF COPOLYMERS OF ETHYLENICALLY UNSATURATED CARBOXYLIC ACID AND AT LEAST ONE ETHYLENICALLY UNSATURATED NONCARBOXYLIC COMPOUND COPOLYMERIZABLE WITH SAID ACID AND ALKALI METAL SALTS THEREOF, THE CALCIUM SALT OF SAID VISCOSITY IMPROVER BEING SOLUBLE IN WATER.
Claim 2
Dependent Claim
73 words
A PROCESS FOR INCREASING THE YIELD OF OIL UPON FLOODING OIL DEPOSITS WITH WATER COMPRISING FLOODING OIL DEPOSITS WITH WATER CONTAINING A VISCOSITY IMPROVER HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 600,000 SELECTED FROM THE GROUP CONSISTING OF COPOLYMERS OF ETHYLENICALLY UNSATURATED CARBOXYLIC ACID AND AT LEAST ONE ETHYLENICALLY UNSATURATED NONCARBOXYLIC COMPOUND COPOLYMERIZABLE WITH SAID ACID AND ALKALI METAL SALTS THEREOF, THE CALCIUM SALT OF SAID VISCOSITY IMPROVER BEING SOLUBLE IN WATER.
References Cited (Backward Citations)
US2341500A
Cited
US2718497A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-07 | 1962-01-06 | 1962-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-07 | 1966-01-06 | 1966-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-07 | 1970-01-06 | 1970-07-08 | $7700.00 | Window Closed / Lapsed |