US4069161A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of aqueous solutions of polyacrylamides
Assignee: Individual
•
Filing: 1974-06-24
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Granted: 1978-01-17
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Expires: 1994-06-24
Abstract
Abstract Polymer gel, e.g. polyacrylamide gel, is chilled until frozen and is ground up in a mill. The frozen particles of the polymer gel are then dissolved in water to form an aqueous solution having good efficiency in the recovery of petroleum from formations.
Inventors
- 👤 Richard J. Pogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:10
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C09; C09K; C09K8/00; C09K8/58; C09K8/588; E; E21; E21B; E21B43/00; E21B43/16; E21B43/20; C08J2300/00; C08J2300/10; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0391
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
92 words
In a process for the production of aqueous solutions of polymer, the improvement comprising: a. chilling, until frozen, a gel of a polymer selected from the group consisting of polyacrylamide, hydroxyethyl cellulose, vinyl acetate-crotonic acid polymer, and polyvinyl acetate/polyvinyl pyrrolidone to within a temperature range of about -30 to about -320° F., b. grinding the gel while chilled to form frozen particles of the polymer having an average particle size in the range of from about 250 to about 1000 microns, c. dissolving the ground particles of the polymer gel in water.
Claim 2
Dependent Claim
92 words
In a process for the production of aqueous solutions of polymer, the improvement comprising: a. chilling, until frozen, a gel of a polymer selected from the group consisting of polyacrylamide, hydroxyethyl cellulose, vinyl acetate-crotonic acid polymer, and polyvinyl acetate/polyvinyl pyrrolidone to within a temperature range of about -30 to about -320° F., b. grinding the gel while chilled to form frozen particles of the polymer having an average particle size in the range of from about 250 to about 1000 microns, c. dissolving the ground particles of the polymer gel in water.
Claim 3
Dependent Claim
75 words
In a process for the production of aqueous solutions of polyacrylamide, the improvement comprising: a. chilling, until frozen, a gel of polyacrylamide to within a temperature range of from about -30° to about -320° F., b. grinding the gel while chilled to form frozen particles of the polymer having an average particle size in the range of from about 250 to about 1000 microns, c. dissolving the ground particles of the polymer gel in water.
Claim 4
Dependent Claim
75 words
In a process for the production of aqueous solutions of polyacrylamide, the improvement comprising: a. chilling, until frozen, a gel of polyacrylamide to within a temperature range of from about -30° to about -320° F., b. grinding the gel while chilled to form frozen particles of the polymer having an average particle size in the range of from about 250 to about 1000 microns, c. dissolving the ground particles of the polymer gel in water.
Claim 5
Dependent Claim
79 words
A process for the production of aqueous solutions of polyacrylamide polymer, the improvement comprising in combination: a. placing polyacrylamide gel into direct contact with a suitable refrigerant to chill the gel to a temperature of about -30° to about -320° F. until frozen, b. grinding the gel while frozen to form particles of polyacrylamide having average particle size in the range of from about 250 to about 1000 microns, c. dissolving the ground particles of polyacrylamide gel in water.
Claim 6
Dependent Claim
79 words
A process for the production of aqueous solutions of polyacrylamide polymer, the improvement comprising in combination: a. placing polyacrylamide gel into direct contact with a suitable refrigerant to chill the gel to a temperature of about -30° to about -320° F. until frozen, b. grinding the gel while frozen to form particles of polyacrylamide having average particle size in the range of from about 250 to about 1000 microns, c. dissolving the ground particles of polyacrylamide gel in water.
Claim 7
Dependent Claim
23 words
An aqueous solution of polyacrylamide polymer suitable for use in supplemented recovery of petroleum and prepared according to the process of claim 1.
Claim 8
Dependent Claim
23 words
An aqueous solution of polyacrylamide polymer suitable for use in supplemented recovery of petroleum and prepared according to the process of claim 3.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-16 | 1981-07-18 | 1982-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-16 | 1985-07-18 | 1986-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-16 | 1989-07-18 | 1990-01-17 | $7700.00 | Window Closed / Lapsed |