Granted Patent
Utility
US 5,198,579 · App. 07/789,926
Catalyst for oxidizing methacrolein and method for preparing methacrylic acid
Inventors:
Tadatoshi Honda, Nobuhiko Horiuchi, Jun Kitagawa, Masami Murakami, Kazunori Kawahara, Hirofumi Io
Patented Case
View Patent ↗
Granted: Mar 30, 1993
Filed: Nov 12, 1991
Inventors
Tadatoshi Honda
Nobuhiko Horiuchi
Jun Kitagawa
Masami Murakami
Kazunori Kawahara
Hirofumi Io
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.