Patent US4123397A successfully refreshed from Google Patents.
US4123397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Agglomeration of starch-hydrolyzed polyacrylonitrile graft copolymer
Assignee: VARIED INVESTMENTS Inc
•
Filing: 1977-06-15
•
Granted: 1978-10-31
•
Expires: 1997-06-15
Abstract
Abstract A method of agglomerating and desolventizing starch-hydrolyzed polyacrylonitrile graft copolymer using atomized, liquid water.
Inventors
- 👤 Duane A. Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:52
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; C08J2351/00; C08J2351/02; Y; Y10; Y10S; Y10S47/00; Y10S47/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
87 words
A process of agglomerating and desolventizing starch-hydrolyzed polyacrylonitrile graft copolymer wherein said acrylonitrile is hydrolyzed to carboxamide and alkali metal carboxylate groups, comprising wetting particles of starch-hydrolyzed polyacrylonitrile copolymer during mixing with atomized, liquid water until the moisture content of the particles reaches about 17% to 22% by weight based upon the weight of the total composition and subsequently drying the particles at a temperature between about 25° C. to 100° C. to a moisture content of about 3% to 12.5% by weight of the total composition.
Claim 2
Dependent Claim
87 words
A process of agglomerating and desolventizing starch-hydrolyzed polyacrylonitrile graft copolymer wherein said acrylonitrile is hydrolyzed to carboxamide and alkali metal carboxylate groups, comprising wetting particles of starch-hydrolyzed polyacrylonitrile copolymer during mixing with atomized, liquid water until the moisture content of the particles reaches about 17% to 22% by weight based upon the weight of the total composition and subsequently drying the particles at a temperature between about 25° C. to 100° C. to a moisture content of about 3% to 12.5% by weight of the total composition.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the drying temperature is between about 40° C. and 80° C.
Claim 4
Dependent Claim
25 words
The process of claim 1 wherein the final moisture content of the copolymer is between about 7.5% to 12.5% by weight of the total composition.
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) | 1981-10-30 | 1982-05-01 | 1982-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-30 | 1986-05-01 | 1986-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-30 | 1990-05-01 | 1990-10-31 | $7700.00 | Window Closed / Lapsed |