Polysaccharide esters and their salts
April 19, 2009. 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 3402236 3474163 Ultrapure hyaluronic acid and the use thereof Process for the production of hydrophilic filaments and fibres by the dry jet wet-spinning method Process for forming shaped cellulosic product Method of preparing high strength and modulus polyvinyl alcohol fibers Producing high tenacity, high modulus crystalline article such as fiber or film Oligosaccharides Esters of hyaluronic acid Patent #: 4851521 InventorsAssigneeApplicationNo. 339919 filed on 04/19/1989US Classes:536/55.1, Polysaccharides424/423, Surgical implant or material424/443, Web, sheet or filament bases; compositions of bandages; or dressings with incorporated medicaments424/489, Particulate form (e.g., powders, granules, beads, microcapsules, and pellets)424/490, Coated (e.g., microcapsules)514/54, Polysaccharide514/969OINTMENT OR SALVE BASEExaminersPrimary: Griffin, Ronald W.Attorney, Agent or FirmForeign Patent References
International ClassesA61K 031/70C07H 001/00 C07G 003/00 Foreign Application Priority Data1985-07-08 ITAbstractThe invention concerns the esters of hyaluronic acid in which all or only a portion of the carboxylic groups of the acid are esterified, and the salts of the partial esters with metals or with pharmacologically acceptable organic bases.The compounds possess interesting and precious bioplastic and pharmaceutical properties and may be used in innumerable fields, including cosmetics, surgery and medicine. The invention also includes pharmaceutical preparations containing, as an active ingredient, one or more hyaluronic acid esters, or a salt thereof as described above, as well as medicaments containing:(1) a pharmacologically active substance or an association of pharmacologically active substances and(2) a carrying vehicle containing a total or partial ester of hyaluronic acid.The invention includes also various uses of the hyaluronic esters or of the above mentioned medicaments, such as in medicine, surgery or cosmetics.The invention also relates to a new procedure for the preparation of polysaccharide esters containing carboxylic groups, such as in particular the above mentioned hayluronic acid esters.Other References
Field of SearchFORMING CONTINUOUS OR INDEFINITE LENGTH WORKLiquid is solvent extractive Solidifying by evaporation of liquid solvent or liquid carrier Polysaccharides Polysaccharide OINTMENT OR SALVE BASE Surgical implant or material Web, sheet or filament bases; compositions of bandages; or dressings with incorporated medicaments Particulate form (e.g., powders, granules, beads, microcapsules, and pellets) Coated (e.g., microcapsules) |
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