US4558091A
Expired / Lapsed
US
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Method for preparing aluminum and polyhydric alcohol modified liquid absorbing composition
Assignee: VARIED INVESTMENTS Inc
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Filing: 1984-08-07
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Granted: 1985-12-10
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Expires: 2004-08-07
Abstract
Abstract Modification of a starch hydrolyzed polyacrylonitrile graft copolymer with aluminum or with aluminum and a polyhydric alcohol.
Inventors
- 👤 Edward D. Hubbard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:38
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/42
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
26 words
A method for modifying a hydrolyzed starchpolyacrylonitrile or methacrylonitrile graft copolymer which comprises treating said copolymer in dry state with an aqueous source of aluminum ions.
Claim 2
Independent Claim
26 words
A method for modifying a hydrolyzed starchpolyacrylonitrile or methacrylonitrile graft copolymer which comprises treating said copolymer in dry state with an aqueous source of aluminum ions.
Claim 3
Dependent Claim
17 words
A method in accordance with claim 1 wherein the copolymer is treated with aluminum at ambient temperature.
Claim 4
Dependent Claim
18 words
A method in accordance with claim 1 wherein the copolymer is treated with aluminum at an elevated temperature.
Claim 5
Independent Claim
33 words
A method for modifying a hydrolyzed starch polyacrylonitrile or methacrylonitrile graft copolymer which comprises treating said compolymer in dry state with a mixture of a polyhydric alcohol and a source of aluminum ions.
Claim 6
Independent Claim
33 words
A method for modifying a hydrolyzed starch polyacrylonitrile or methacrylonitrile graft copolymer which comprises treating said compolymer in dry state with a mixture of a polyhydric alcohol and a source of aluminum ions.
Claim 7
Dependent Claim
23 words
A method in accordance with claim 4 wherein an aqueous mixture of a polyhydric alcohol and a source of aluminum ions is employed.
Claim 8
Dependent Claim
18 words
A method in accordance with claim 4 wherein the copolymer is treated with said mixture at ambient temperature.
Claim 9
Dependent Claim
19 words
A method in accordance with claim 4 wherein the copolymer is treated with said mixture at an elevated temperature.
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) | 1988-12-09 | 1989-06-10 | 1989-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-09 | 1993-06-10 | 1993-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-09 | 1997-06-10 | 1997-12-10 | $7700.00 | Window Closed / Lapsed |