Granted Patent
Utility
US 4,798,654 · App. 07/184,181
Process for preparing bisphenol A
Inventors:
Shigeru Iimuro, Takashi Kitamura, Yoshio Morimoto
Patented Case
View Patent ↗
Granted: Jan 17, 1989
Filed: Apr 21, 1988
Inventors
Shigeru Iimuro
Takashi Kitamura
Yoshio Morimoto
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.