Polyvinyl alcohol ophthalmic gel
Patent 4255415 Issued on March 10, 1981. Estimated Expiration Date: 
November 22, 1998. 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 22, 1998. 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 2703777 2861920 3214338 3608073 3767788 Ophthalmic formulation Patent #: 4003991 InventorsAssigneeApplicationNo. 05/962812 filed on 11/22/1978US Classes:514/40, Two saccharide radicals bonded through only oxygen to 4- and 6- positions of the cyclohexyl ring424/606, Sodium containing or fluorine containing424/660, Borates514/179, Modified C-ring (except methyl in 13-position) (e.g., double bond containing, substituted, etc.)514/180, 9-position substituted514/397, Additional hetero ring514/402, Additional hetero ring514/669PolyhydroxyExaminersPrimary: Robinson, Douglas W.Attorney, Agent or FirmInternational ClassA61K 9/00 (20060101)AbstractAn ophthalmic gel having an improved intensity and duration of the biological response is provided by utilizing a polyvinyl alcohol-sodium borate gel buffered to a pH of 6.5-8.5.Other References
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