Granted Patent
Utility
US 4,269,852 · App. 06/073,909
4'-Substituted-4,5',8-trialkylpsoralens
Inventor:
Kurt D. Kaufman
Patented Case
View Patent ↗
Granted: May 26, 1981
Filed: Sep 10, 1979
Inventor
Kurt D. Kaufman
Assignee (at issue)
Thomas C. Elder, 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.