Granted Patent
Utility
US 4,404,385 · App. 06/161,965
Novel modification of perylenetetracarboxylic acid-bis-(3,5-dimethylphenyl)imide
Inventor:
Fridolin Babler
Patented Case
View Patent ↗
Granted: Sep 13, 1983
Filed: Jun 23, 1980
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.