Granted Patent
Utility
US 4,940,832 · App. 07/365,635
Process for separating 2,6-dimethylnaphthalene
Inventors:
Tsutomu Miyashi, Yoshiro Yamashita, Takanori Suzuki, Hiroshi Fujii
Patented Case
View Patent ↗
Granted: Jul 10, 1990
Filed: Jun 13, 1989
Inventors
Tsutomu Miyashi
Yoshiro Yamashita
Takanori Suzuki
Hiroshi Fujii
Assignees (at issue)
Tsutomu Miyashi
Mitsubishi Oil Co., 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.