Pyroglutamic acid esters used as dermal penetration enhancers for drugs
Patent 5066648 Issued on November 19, 1991. Estimated Expiration Date: 
September 13, 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 13, 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.Inventors
AssigneeApplicationNo. 589221 filed on 09/13/1990US Classes:514/174, -O-C-O- is part of a hetero ring (e.g., acetonide, etc.)514/179, Modified C-ring (except methyl in 13-position) (e.g., double bond containing, substituted, etc.)514/263.32, Nitrogen containing hetero ring in the perservative, stabilizer, or additional active ingredient514/469Bicyclo ring system having the hetero ring as one of the cyclosExaminersPrimary: Friedman, Stanley J.Attorney, Agent or FirmInternational ClassesA61K 031/34A61K 031/52 A61K 031/56 A61K 031/58 AbstractThe invention relates to pyroglutamic acid esters used as dermal penetration enhancers for therapeutic agents having poor skin permeation. | |
