US3894879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of suspending soluble xanthan gum and pumpable compositions so produced
Assignee: Kelco Co
•
Filing: 1974-11-04
•
Granted: 1975-07-15
•
Expires: 1994-11-04
Abstract
Abstract Water soluble xanthan gum can be prepared as highly concentrated pumpable suspensions in alcohol-water carriers using hydroxyalkyl cellulose derivatives as the suspending agents. The amount of hydroxyalkyl cellulose in the total composition is between 0.5 and 1.0%, which can be used to suspend between 20 and 50% xanthan.
Inventors
- 👤 George T Colegrove
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:23
CPC Classifications
A; A61; A61Q; A61Q19/00; A61K; A61K8/00; A61K8/18; A61K8/72; A61K8/73; A61K8/731; C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K5/00; C08K5/04; C08K5/05; C08L; C08L1/00; C08L1/08; C08L1/26; C08L1/28; C08L5/00; C09; C09D; C09D7/00; C09D7/40; C09D7/45; A61K2800/00; A61K2800/40; A61K2800/54; A61K2800/542; A61K2800/5422; A61K2800/59; A61K2800/594
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
42 words
The process of preparing a pumpable suspension of a water soluble xanthan gum which comprises mixing about 20 to 50% of said xanthan gum and about 0.5 to 10% hydroxyalkyl cellulose derivative in an alcohol solvent or in an alcohol-water solvent system.
Claim 2
Dependent Claim
42 words
The process of preparing a pumpable suspension of a water soluble xanthan gum which comprises mixing about 20 to 50% of said xanthan gum and about 0.5 to 10% hydroxyalkyl cellulose derivative in an alcohol solvent or in an alcohol-water solvent system.
Claim 3
Dependent Claim
24 words
The process of claim 1 in which the xanthan is added to a previously prepared blend of the hydroxyalkyl cellulose derivative and the solvent.
Claim 4
Dependent Claim
17 words
The process of claim 2 wherein the solvent is an alcohol-water system containing 20 to 50% water.
Claim 5
Dependent Claim
16 words
The process of claim 1 wherein the alcohol is a lower alkanol having 1-5 carbon atoms.
Claim 6
Dependent Claim
33 words
The process of claim 1 wherein the hydroxyalkyl cellulose derivative has the formula R-O-R''''OH wherein R is the cellulose backbone, and R'''' is a straight or branched alkyl chain of 3-5 carbon atoms.
Claim 7
Dependent Claim
20 words
The process of claim 5 wherein the hydroxyalkyl cellulose derivative is hydroxypropyl cellulose, hydroxypropyl methyl cellulose, or hydroxybutyl methyl cellulose.
Claim 8
Dependent Claim
56 words
A PUMPABLE SUSPENSION OF A WATER SOLUBLE XANTHAN GUM COMPRISING A SOLVENT SYSTEM OF ALCOHOL OR ALCOHOL-WATER BLEND, WHEREIN THE WATER CONTENT OF THE BLEND IS FROM ABOUT 20 TO 40%, SAID SOLVENT SYSTEM CONTAINING FROM ABOUT 0.5 TO 1.0% BY WEIGHT OF HYDROXYALKYL CELLULOSE DERIVATIVE, AND BETWEEN ABOUT 20 TO 50% OF SAID XANTHAN GUM.
Claim 9
Dependent Claim
56 words
A PUMPABLE SUSPENSION OF A WATER SOLUBLE XANTHAN GUM COMPRISING A SOLVENT SYSTEM OF ALCOHOL OR ALCOHOL-WATER BLEND, WHEREIN THE WATER CONTENT OF THE BLEND IS FROM ABOUT 20 TO 40%, SAID SOLVENT SYSTEM CONTAINING FROM ABOUT 0.5 TO 1.0% BY WEIGHT OF HYDROXYALKYL CELLULOSE DERIVATIVE, AND BETWEEN ABOUT 20 TO 50% OF SAID XANTHAN GUM.
Claim 10
Dependent Claim
12 words
The composition of claim 7 wherein the solvent system is alcohol-water blend.
Claim 11
Dependent Claim
16 words
The composition of claim 8 wherein the alcohol is a lower alkanol having 1-5 carbon atoms.
Claim 12
Dependent Claim
13 words
The composition of claim 9 wherein the alcohol is methanol, ethanol, or isopropanol.
Claim 13
Dependent Claim
31 words
The composition of claim 7 wherein the hydroxyalkyl cellulose derivative is R-O-R''''-OH wherein R is the cellulose backbone, and R'''' is a straight or branched chain alkyl of 3-5 carbon atoms.
Claim 14
Dependent Claim
20 words
The composition of claim 11 wherein the hydroxyalkyl cellulose derivative is hydroxypropyl cellulose, hydroxypropyl methyl cellulose, or hydroxybutyl methyl cellulose.
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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) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |