Granted Patent
Utility
US 6,825,294 · App. 09/646,128
Catalysts for polymerizing styrene and other monomer and process for producing styrene polymer
Inventors:
Nobuhiro Yabunouchi, Norio Tomotsu
Patented Case
View Patent ↗
Granted: Nov 30, 2004
Filed: Sep 28, 2000
Inventors
Nobuhiro Yabunouchi
Norio Tomotsu
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.