Granted Patent
Utility
US 4,351,958 · App. 06/297,166
Process for producing orthoalkylated aromatic amine
Inventors:
Kazunori Takahata, Katsuo Taniguchi
Patented Case
View Patent ↗
Granted: Sep 28, 1982
Filed: Aug 28, 1981
Inventors
Kazunori Takahata
Katsuo Taniguchi
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.