Granted Patent
Utility
US 5,026,876 · App. 07/467,377
Process for producing maleic anhydride
Inventors:
Harusige Sugawara, Takasi Okawa
Patented Case
View Patent ↗
Granted: Jun 25, 1991
Filed: Jan 19, 1990
Inventors
Harusige Sugawara
Takasi Okawa
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.