Granted Patent
Utility
US 6,740,784 · App. 10/257,980
Process for producing bisphenol A
Inventors:
Masahiro Iwahara, Tetsuya Saruwatari
Patented Case
View Patent ↗
Granted: May 25, 2004
Filed: Oct 29, 2002
Inventors
Masahiro Iwahara
Tetsuya Saruwatari
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.