Granted Patent
Utility
US 4,791,235 · App. 07/126,417
Process for separating 2,6-dimethylnaphthalene
Inventors:
Takao Maki, Toshiharu Yokoyama, Akio Nakanishi, Katashi Shioda, Haruki Asatani
Patented Case
View Patent ↗
Granted: Dec 13, 1988
Filed: Nov 30, 1987
Inventors
Takao Maki
Toshiharu Yokoyama
Akio Nakanishi
Katashi Shioda
Haruki Asatani
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.