US4146705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for increasing solution viscosity of Arthrobacter stabilis polysaccharides
Assignee: United States Department of Agriculture
•
Filing: 1977-06-17
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Granted: 1979-03-27
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Expires: 1997-06-17
Abstract
Abstract The extracellular heteropolysaccharide produced by the bacterium Arthrobacter stabilis NRRL B-3225 is treated by acidification, drying, and controlled heating to substantially increase its viscosity in aqueous solutions and to tailor it to particular conditions of use.
Inventors
- 👤 Clarence A. Knutson, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:04
CPC Classifications
C; C08; C08L; C08L5/00; C12; C12P; C12P19/00; C12P19/04; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
77 words
A method for treating the extracellular heteropolysaccharide produced by the bacterium Arthrobacter stabilis NRRL B-3225 comprising the following steps: a. providing said polysaccharide in its acidified form; b. drying the acidified polysaccharide from step (a) to below about 25% moisture, dry weight basis; and c. heating the dried polysaccharide from step (b) to a temperature in the range of from 80° C. to 100° C. for a time period of from about 130 to about 5 minutes.
Claim 2
Independent Claim
77 words
A method for treating the extracellular heteropolysaccharide produced by the bacterium Arthrobacter stabilis NRRL B-3225 comprising the following steps: a. providing said polysaccharide in its acidified form; b. drying the acidified polysaccharide from step (a) to below about 25% moisture, dry weight basis; and c. heating the dried polysaccharide from step (b) to a temperature in the range of from 80° C. to 100° C. for a time period of from about 130 to about 5 minutes.
Claim 3
Dependent Claim
18 words
The method as described in claim 1 wherein said polysaccharide in step (a) is at least 40% acidified.
Claim 4
Dependent Claim
16 words
The method as described in claim 1 wherein said polysaccharide in step (a) is completely acidified.
Claim 5
Dependent Claim
26 words
The method as described in claim 1 wherein said temperature is about 90° C. and said time period is in the range of about 40-50 minutes.
Claim 6
Independent Claim
98 words
A method for preparing viscous aqueous solutions of the extracellular heteropolysaccharide produced by the bacterium Arthrobacter stabilis NRRL B3225 comprising the following steps: a. providing said polysaccharide in its acidified form; b. drying the acidified polysaccharide from step (a) to below about 25% moisture, dry weight basis; c. heating the dried polysaccharide from step (b) to a temperature in the range of from 80° C. to 100° C. for a time period of from about 130 to about 5 minutes; d. dissolving said heated polysaccharide from step (c) in water; and e. neutralizing said dissolved polysaccharide with base.
Claim 7
Independent Claim
98 words
A method for preparing viscous aqueous solutions of the extracellular heteropolysaccharide produced by the bacterium Arthrobacter stabilis NRRL B3225 comprising the following steps: a. providing said polysaccharide in its acidified form; b. drying the acidified polysaccharide from step (a) to below about 25% moisture, dry weight basis; c. heating the dried polysaccharide from step (b) to a temperature in the range of from 80° C. to 100° C. for a time period of from about 130 to about 5 minutes; d. dissolving said heated polysaccharide from step (c) in water; and e. neutralizing said dissolved polysaccharide with base.
Claim 8
Dependent Claim
18 words
The method as described in claim 5 wherein said polysaccharide in step (a) is at least 40% acidified.
Claim 9
Dependent Claim
16 words
The method as described in claim 5 wherein said polysaccharide in step (a) is completely acidified.
Claim 10
Dependent Claim
26 words
The method as described in claim 5 wherein said temperature is about 90° C. and said time period is in the range of about 40-50 minutes.
Claim 11
Dependent Claim
26 words
The method as described in claim 5, wherein in step (d) said heated polysaccharide is dissolved in water at a concentration in the range of 0.2-1%.
Claim 12
Dependent Claim
22 words
The method as described in claim 5 wherein in step (d) said water contains 0.1-3% of a solute other than said polysaccharide.
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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) | 1982-03-26 | 1982-09-25 | 1983-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-26 | 1986-09-25 | 1987-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-26 | 1990-09-25 | 1991-03-27 | $7700.00 | Window Closed / Lapsed |