Granted Patent
Utility
US 5,780,652 · App. 08/890,251
Process for chroman carboxylates
Inventor:
Robert Eugene Hormann
Patented Case
View Patent ↗
Granted: Jul 14, 1998
Filed: Jul 9, 1997
Inventor
Robert Eugene Hormann
Assignee (at issue)
Rohm and Haas Company
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.