Granted Patent
Utility
US 4,329,517 · App. 06/149,583
Process for production of mono- or di-ortho-methyl-substituted phenols by catalytic methylation and catalyst therefor
Inventors:
Katsuo Taniguchi, Kazunori Takahata, Yoshiaki An-Nen
Patented Case
View Patent ↗
Granted: May 11, 1982
Filed: May 14, 1980
Inventors
Katsuo Taniguchi
Kazunori Takahata
Yoshiaki An-Nen
Assignee (at issue)
Mitsui Petrochemical Industries, Ltd.
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.