Granted Patent
Utility
US 5,284,968 · App. 07/769,356
Process for preparing bis (4-cyanatophenyl)-1,1-ethane
Inventor:
Wallace M. Craig, Jr.
Patented Case
View Patent ↗
Granted: Feb 8, 1994
Filed: Sep 30, 1991
Inventor
Wallace M. Craig, Jr.
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.