Granted Patent
Utility
US 4,946,877 · App. 07/307,639
Process for producing bisphenol A
Inventors:
Shigeru Imuro, Yoshio Morimoto, Takashi Kitamura
Patented Case
View Patent ↗
Granted: Aug 7, 1990
Filed: Feb 7, 1989
Inventors
Shigeru Imuro
Yoshio Morimoto
Takashi Kitamura
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.