Granted Patent
Utility
US 5,248,839 · App. 07/846,997
Preparation process of bisphenol A
Inventors:
Shigeru Iimuro, Akira Yamada, Kenichi Ohmura, Toshio Houri, Tsuguo Kawamura
Patented Case
View Patent ↗
Granted: Sep 28, 1993
Filed: Apr 7, 1992
Inventors
Shigeru Iimuro
Akira Yamada
Kenichi Ohmura
Toshio Houri
Tsuguo Kawamura
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.