Granted Patent
Utility
US 4,380,676 · App. 06/236,467
Process for the production of 2,2'-dihydroxy-biphenyls
Inventor:
Michael Rasberger
Patented Case
View Patent ↗
Granted: Apr 19, 1983
Filed: Feb 20, 1981
Inventor
Michael Rasberger
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.