Granted Patent
Utility
US 4,556,751 · App. 06/579,958
Catalytic isomerization process of dimethylnaphthalenes
Inventors:
Takao Maki, Tetsuo Masuyama, Yoshio Asahi
Patented Case
View Patent ↗
Granted: Dec 3, 1985
Filed: Feb 14, 1984
Inventors
Takao Maki
Tetsuo Masuyama
Yoshio Asahi
Assignee (at issue)
Mitsubishi Chemical 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.