Granted Patent
Utility
US 5,043,387 · App. 07/332,991
Epoxy resin reacted with primary amine, active hydrogen compound and esterifying agent to yield polyol resin
Inventors:
Hideo Nakamura, Masaru Wakizaka, Yohzoh Yamamoto
Patented Case
View Patent ↗
Granted: Aug 27, 1991
Filed: Apr 4, 1989
Inventors
Hideo Nakamura
Masaru Wakizaka
Yohzoh Yamamoto
Assignees (at issue)
Mitsui Petrochemical Industries, Ltd.
RICOH COMPANY, LTD.
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.