US3476186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of petroleum by flooding with viscous aqueous solutions of acrylic acid-acrylamide-diacetone acrylamide copolymer
Assignee: Union Oil Company of California
•
Filing: 1967-12-21
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Granted: 1969-11-04
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Expires: 1987-12-21
Abstract
No abstract record available.
Inventors
- 👤 Amir M Sarem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:10
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/588; C08; C08F; C08F20/00; C08F20/02; C08F20/52; C08F20/62
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2827964A
Cited
FR1206042A
Cited
US3002960A
Cited
US2985633A
Cited
US3070158A
Cited
US3039529A
Cited
US3277056A
Cited
US3396790A
Cited
US3399725A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-03 | 1973-05-05 | 1973-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-03 | 1977-05-05 | 1977-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-03 | 1981-05-05 | 1981-11-04 | $7700.00 | Window Closed / Lapsed |