Granted Patent
Utility
US 6,653,513 · App. 09/582,085
Process for producing bisphenol A
Inventor:
Masahiro Iwahara
Patented Case
View Patent ↗
Granted: Nov 25, 2003
Filed: Jun 22, 2000
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.