Tretinoin in a gel vehicle for acne treatment
Patent 4247547 Issued on January 27, 1981. Estimated Expiration Date: 
March 19, 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.
March 19, 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 References 3729568 3867533 InventorApplicationNo. 06/022022 filed on 03/19/1979US Classes:514/179, Modified C-ring (except methyl in 13-position) (e.g., double bond containing, substituted, etc.)424/78.05, Anti-inflammatory or anti-irritant (e.g., anti-arthritic, etc.)514/171, With additional active ingredient514/944GELExaminersPrimary: Schenkman, LeonardAttorney, Agent or FirmInternational ClassesA61K 8/67 (20060101)A61K 8/30 (20060101) AbstractAn acne treatment gel composition, effective at low concentrations of tretinoin, is provided for topical application. The composition is highly effective in treating acne conditions and is capable of being stored without refrigeration for long periods of time without losing therapeutic effectiveness and while maintaining the uniformity and stability of the gel.Other References
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