Granted Patent
Utility
US 4,286,097 · App. 06/058,224
Carboxylic acid dianhydrides based on trimellitic anhydride
Inventors:
Jurgen Habermeier, Eduard Knecht, Rudolf Gisler
Patented Case
View Patent ↗
Granted: Aug 25, 1981
Filed: Jul 16, 1979
Inventors
Jurgen Habermeier
Eduard Knecht
Rudolf Gisler
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.