Granted Patent
Utility
US 6,429,343 · App. 09/926,047
Process for producing bisphenol a
Inventor:
Masahiro Iwahara
Patented Case
View Patent ↗
Granted: Aug 6, 2002
Filed: Aug 21, 2001
Inventor
Masahiro Iwahara
Assignee (at issue)
Idemitsu Petrochemical Co., 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.