Granted Patent
Utility
US 4,892,962 · App. 07/129,198
Process for the preparation of 2,2-difluoropent-4-enoic acids and acid derivatives
Inventor:
Robert W. Lang
Patented Case
View Patent ↗
Granted: Jan 9, 1990
Filed: Dec 7, 1987
Inventor
Robert W. Lang
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.