Granted Patent
Utility
US 5,498,731 · App. 08/266,510
Oxide catalyst and process for producing maleic anhydride by using oxide catalyst
Inventors:
Yasushi Tsurita, Masumi Ito, Ken Shiraga
Patented Case
View Patent ↗
Granted: Mar 12, 1996
Filed: Jun 27, 1994
Inventors
Yasushi Tsurita
Masumi Ito
Ken Shiraga
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.