Granted Patent
Utility
US 5,149,841 · App. 07/694,525
N,N,N',N'-tetraclycidyl-4,4'-diaminodiphenylmethanes
Inventor:
Werner Schaffner
Patented Case
View Patent ↗
Granted: Sep 22, 1992
Filed: May 1, 1991
Inventor
Werner Schaffner
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.