Granted Patent
Utility
US 5,347,014 · App. 08/013,444
Process for preparing 1,4-diketo-3,6-diphenylpyrrolo-[3,4-C]-pyrrole
Inventor:
Fridolin Babler
Patented Case
View Patent ↗
Granted: Sep 13, 1994
Filed: Feb 4, 1993
Inventor
Fridolin Babler
Assignee (at issue)
Ciba-Geigy
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.