US4098987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-ionic surfactants from water soluble copolymers of acrylamide with hydrophobic monomers
Assignee: Wyeth Holdings LLC
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Filing: 1976-07-14
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Granted: 1978-07-04
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Expires: 1996-07-14
Abstract
Abstract Polymeric surfactants are copolymers of acrylamide with 30 - 60 wt. percent of acrylic esters or alkyl or alkoxymethyl acrylamides having molecular wt. from 800 to 10,000 amu.
Inventors
- 👤 Girish Chandra Barua
- 👤 Daniel Elmer Nagy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:32
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/52; C08F220/54; C08F220/56; C08F2/00; C08F2/12; C08F2/16; C08F2/22; C08F2/24; C08F2/30; C09; C09K; C09K23/00; C09K23/16
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
72 words
A water-soluble polymer consisting of copolymerized monomers consisting of 40 to 70 percent by weight acrylamide and 30 to 60 percent by weight of at least one monomer selected from the group consisting of styrene, lower alkyl esters of acrylic acid, lower alkyl esters of methacrylic acid, and the alkyl and alkoxymethyl acrylamides in which alkyl contains 4 to 13 carbon atoms, said polymer having non-ionic surface active properties in aqueous solution.
Claim 2
Dependent Claim
72 words
A water-soluble polymer consisting of copolymerized monomers consisting of 40 to 70 percent by weight acrylamide and 30 to 60 percent by weight of at least one monomer selected from the group consisting of styrene, lower alkyl esters of acrylic acid, lower alkyl esters of methacrylic acid, and the alkyl and alkoxymethyl acrylamides in which alkyl contains 4 to 13 carbon atoms, said polymer having non-ionic surface active properties in aqueous solution.
Claim 3
Dependent Claim
25 words
A water-soluble polymer defined by claim 1 wherein the copolymerized monomers consist of 60 percent by weight acrylamide and 40 percent by weight isobutoxymethyl acrylamide.
Claim 4
Dependent Claim
26 words
A water-soluble polymer defined by claim 1 wherein the copolymerized monomers consist of 60 percent by weight acrylamide and 40 percent by weight tertiary butyl acrylamide.
Claim 5
Dependent Claim
25 words
A water-soluble polymer defined by claim 1 wherein the copolymerized monomers consist of 65 percent by weight acrylamide and 35 percent by weight butyl acrylate.
Claim 6
Dependent Claim
26 words
A water-soluble polymer defined by claim 1 wherein the copolymerized monomers consist of 65 percent by weight acrylamide and 35 percent by weight tertiary octyl acrylamide.
Claim 7
Dependent Claim
25 words
A water-soluble polymer defined by claim 1 wherein the copolymerized monomers consist of 40 percent by weight acrylamide and 60 percent by weight isobutoxymethyl acrylamide.
Claim 8
Dependent Claim
25 words
A water-soluble polymer defined by claim 1 wherein the copolymerized monomers consist of 65 percent by weight acrylamide and 35 percent by weight methyl methacrylate.
References Cited (Backward Citations)
US2486191A
Cited
US2978432A
Cited
US2831841A
Cited
US3117108A
Cited
US3753958A
Cited
US3925287A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |