Granted Patent
Utility
US 6,310,219 · App. 09/450,126
Process for the production of maleic anhydride
Inventors:
Itaru Sawaki, Hideo Suwa, Yasunori Ishimura, Yoshiaki Iizuka, Mineo Izumi
Patented Case
View Patent ↗
Granted: Oct 30, 2001
Filed: Nov 26, 1999
Inventors
Itaru Sawaki
Hideo Suwa
Yasunori Ishimura
Yoshiaki Iizuka
Mineo Izumi
Assignee (at issue)
MITSUBISHI CHEMICAL CORPORATION
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.