Enzymatic method for improving the injectability of polysaccharides
Patent 4326037 Issued on April 20, 1982. Estimated Expiration Date: 
November 1, 1999. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 1, 1999. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesClarification of xanthan gum Clarification of xanthan gum Enzyme-filtration clarification of xanthan gum polymer solution Biopolymer filterability improvement by caustic-enzyme treatment Patent #: 4165257 InventorsAssigneeApplicationNo. 06/090176 filed on 11/01/1979US Classes:435/274, Carbohydrate material recovered or purified166/246Using microorganismsExaminersPrimary: Warden, Robert J.Attorney, Agent or FirmInternational ClassesC12P 19/06 (20060101)C09K 8/60 (20060101) C09K 8/90 (20060101) C09K 8/02 (20060101) C09K 8/035 (20060101) C12P 19/00 (20060101) C12P 19/04 (20060101) C08B 37/00 (20060101) AbstractA method for enhancing the ability of polysaccharides in aqueous solution to flow through a porous medium comprises contacting the polysaccharides with an endoenzyme capable of hydrolyzing at least one of the linkages of the sugar units of the polysaccharides and maintaining the polysaccharides in contact with the enzyme under hydrolysis conditions for a time sufficient to decrease the tendency of the polysaccharides to plug the porous medium yet insufficient to decrease the viscosity of the aqueous polysaccharides by more than 25%. The partially hydrolyzed polysaccharides are useful as thickening agents for flooding water used to recover oil from oil-containing subterranean formations. |
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