US3853802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unhydrolyzed polyacrylamide and partially hydrolyzed polyacrylamide mobility control agent
Assignee: Marathon Oil Co
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Filing: 1973-02-26
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Granted: 1974-12-10
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Expires: 1993-02-26
Abstract
Abstract A mixture of unhydrolyzed polyacrylamide together with partially hydrolyzed polyacrylamide is used for recovery of petroleum. The partially hydrolyzed material reduces permeability and the unhydrolyzed material maintains viscosity.
Inventors
- 👤 C Norton
- 👤 D Falk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:16
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/588; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
44 words
COMPOSITIONS COMPRISING AQUEOUS SOLUTIONS OF ABOUT 10 TO ABOUT 10,000 PARTS PER MILLION OF PARTIALLY HYDROLYZED POLYACRYLAMIDE AND ABOUT 10 TO ABOUT 10,000 PARTS PER MILLION OF UNHYDROLYZED POLYACRYLAMIDE, WHEREIN THE PARTIALLY HYDROLYZED POLYACRYLAMIDE POLYMER IS HYDROLYZED FROM ABOUT 0.5 TO ABOUT 75 PERCENT.
Claim 2
Dependent Claim
44 words
COMPOSITIONS COMPRISING AQUEOUS SOLUTIONS OF ABOUT 10 TO ABOUT 10,000 PARTS PER MILLION OF PARTIALLY HYDROLYZED POLYACRYLAMIDE AND ABOUT 10 TO ABOUT 10,000 PARTS PER MILLION OF UNHYDROLYZED POLYACRYLAMIDE, WHEREIN THE PARTIALLY HYDROLYZED POLYACRYLAMIDE POLYMER IS HYDROLYZED FROM ABOUT 0.5 TO ABOUT 75 PERCENT.
Claim 3
Dependent Claim
33 words
Compositions according to claim 1 wherein the partially hydrolyzed polymer is present in a concentration of from about 0.01 to about 1.0 percent by weight based on the weight of the total solution.
Claim 4
Dependent Claim
15 words
Compositions according to claim 1 wherein the unhydrolyzed polyacrylamide has a molecular weight above 100,000.
Claim 5
Dependent Claim
23 words
Compositions according to claim 1 wherein the unhydrolyzed polyacrylamide has a molecular weight in the range of from about 1,000,000 to about 10,000,000.
Claim 6
Dependent Claim
33 words
Compositions according to claim 1 wherein the unhydrolyzed polyacrylamide polymer is present in a concentration of from about 0.01 to about 1.0 percent by weight based on the weight of the total solution.
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) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |