Patent US4012333A successfully refreshed from Google Patents.
US4012333A
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Method of making gels based on biologically produced polysaccharides
Assignee: Hercules LLC
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Filing: 1975-05-23
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Granted: 1977-03-15
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Expires: 1995-05-23
Abstract
Abstract Gels are prepared from a biologically produced beta-1,3-glucan-type polysaccharide by exposing a basic solution of the polysaccharide to an atmosphere of a gaseous acid anhydride.
Inventors
- 👤 Gordon A. Towle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:07
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/0052; B01J13/0065; A; A61; A61K; A61K9/00; A61K9/20; A61K9/28; A61K9/2806; A61K9/2833; A61K9/286
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
70 words
A process for preparing a firm continuous body of a gel of a beta-1,3-glucan polysaccharide which comprises preparing a solution of said beta-1,3-glucan in an aqueous medium having a pH of at least about 10.5 and subjecting said solution under quiescent conditions to an atmosphere of a gaseous acid anhydride under conditions of time and gas pressure sufficient to cause said anhydride to diffuse through said solution and effect gelling.
Claim 2
Dependent Claim
70 words
A process for preparing a firm continuous body of a gel of a beta-1,3-glucan polysaccharide which comprises preparing a solution of said beta-1,3-glucan in an aqueous medium having a pH of at least about 10.5 and subjecting said solution under quiescent conditions to an atmosphere of a gaseous acid anhydride under conditions of time and gas pressure sufficient to cause said anhydride to diffuse through said solution and effect gelling.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein the gaseous acid anhydride is CO 2 .
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein the polysaccharide is present in the solution in a concentration of about 0.1 to 10%.
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) | 1980-03-14 | 1980-09-13 | 1981-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-14 | 1984-09-13 | 1985-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-14 | 1988-09-13 | 1989-03-15 | $7700.00 | Window Closed / Lapsed |