Heteropolysaccharide S-657
Patent 5175278 Issued on December 29, 1992. Estimated Expiration Date: 
September 4, 2010. 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.
September 4, 2010. 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 References 3485719 Polysaccharide S-60 and bacterial fermentation process for its preparation Xanthomonas biopolymer for use in displacement of oil from partially depleted reservoirs Heteropolysaccharide S-194 Patent #: 4401760 InventorsAssigneeApplicationNo. 577824 filed on 09/04/1990US Classes:536/123, Plural diverse saccharides containing (e.g., hetero polysaccharides, etc.)435/101, Polysaccharide of more than five saccharide radicals attached to each other by glycosidic bonds435/252.1, Bacteria or actinomycetales; media therefor435/910, Xanthomonas507/110, Organic component is carbohydrate or derivative thereof (e.g., sugar or gum, such as galactomannan, xanthan, etc.) or carboxylic acid ester of an alcohol which has five or more hydroxy groups bonded directly to carbons507/213, Polysaccharide is a xanthan (e.g., scleroglucans, etc.)507/925, COMPLETION OR WORKOVER FLUID507/936, Flooding the formation536/55.1PolysaccharidesExaminersPrimary: Marx, IreneAttorney, Agent or FirmForeign Patent References
International ClassesC07G 017/00C12P 019/04 C12N 001/20 AbstractThe new heteropolysaccharide S-657, prepared by fermentation of a new strain of Xanthomonas campestris, ATCC 53159, has valuable properties as a thickening, suspending and stabilizing agent in aqueous solutions and is especially valuable for use in well treating fluids.Heteropolysaccharide S-657 is composed principally of carbohydrate, about 12% protein and about 7% (calculated as O-acetyl) acyl groups, the carbohydrate portion containing about 19% glucuronic acid, and the neutral sugars rhamnose and glucose in the approximate molar ratio of 2:1.Other References
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