Granted Patent
Utility
US 5,955,109 · App. 08/079,220
Methods and compositions for topical delivery of retinoic acid
Inventors:
Richard Won, Martin Katz, Chung-Heng Cheng, Sergio Nacht
Patented Case
View Patent ↗
Granted: Sep 21, 1999
Filed: Jun 17, 1993
Inventors
Richard Won
Martin Katz
Chung-Heng Cheng
Sergio Nacht
Assignee (at issue)
Advanced Poymer Systems, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.