Granted Patent
Utility
US 4,963,248 · App. 07/249,160
Process for production of dimethylnaphthalenes
Inventors:
Kyoji Yano, Shirou Aizawa
Patented Case
View Patent ↗
Granted: Oct 16, 1990
Filed: Sep 26, 1988
Inventors
Kyoji Yano
Shirou Aizawa
Assignee (at issue)
Nippon Mining Company Limited
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.