Granted Patent
Utility
US 4,239,915 · App. 05/747,114
Perfluoroalkyl carboxylic acids
Inventor:
Robert A. Falk
Patented Case
View Patent ↗
Granted: Dec 16, 1980
Filed: Dec 2, 1976
Inventor
Robert A. Falk
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.