Granted Patent
Utility
US 5,650,171 · App. 07/875,772
Retinoic acid-containing polyether-polyurethane compositions
Inventors:
John W. Quigley, Jr., Harris Goodman
Patented Case
View Patent ↗
Granted: Jul 22, 1997
Filed: Apr 29, 1992
Inventors
John W. Quigley, Jr.
Harris Goodman
Assignee (at issue)
Penederm, 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.