Granted Patent
Utility
US 4,485,251 · App. 06/452,531
Process for the preparation of bis(perfluoroalkyl-alkylthio)alkanoic acids and lactone intermediates thereof
Inventor:
Robert A. Falk
Patented Case
View Patent ↗
Granted: Nov 27, 1984
Filed: Dec 23, 1982
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.