Granted Patent
Utility
US 5,268,435 · App. 07/713,780
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: Dec 7, 1993
Filed: Jun 12, 1991
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.