Granted Patent
Utility
US 4,957,994 · App. 07/393,798
Epoxy resins containing imido rings, production process thereof and epoxy resin compositions containing the same
Inventors:
Tatsuhiro Urakami, Yoshimitsu Tanabe, Keizaburo Yamaguchi, Akihiro Yamaguchi
Patented Case
View Patent ↗
Granted: Sep 18, 1990
Filed: Aug 15, 1989
Inventors
Tatsuhiro Urakami
Yoshimitsu Tanabe
Keizaburo Yamaguchi
Akihiro Yamaguchi
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.