Granted Patent
Utility
US 4,775,764 · App. 07/078,616
Method for preparing 4,4' difluorobiphenyl
Inventor:
William E. Dummitt
Patented Case
View Patent ↗
Granted: Oct 4, 1988
Filed: Jul 28, 1987
Inventor
William E. Dummitt
Assignee (at issue)
MALLINCKRODT LLC
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.