Granted Patent
Utility
US 6,093,835 · App. 09/119,723
Process for producing maleic anhydride
Inventors:
Itaru Sawaki, Hideo Suwa, Yasunori Ishimura, Tatsuya Ihara
Patented Case
View Patent ↗
Granted: Jul 25, 2000
Filed: Jul 21, 1998
Inventors
Itaru Sawaki
Hideo Suwa
Yasunori Ishimura
Tatsuya Ihara
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.