Granted Patent
Utility
US 4,883,897 · App. 07/135,353
Process for producing 2,6-dichlorobenzonitrile
Inventors:
Yutaka Kiyomiya, Yasumasa Yamaguchi, Masahiro Ushigome, Hiroshi Murata
Patented Case
View Patent ↗
Granted: Nov 28, 1989
Filed: Dec 21, 1987
Inventors
Yutaka Kiyomiya
Yasumasa Yamaguchi
Masahiro Ushigome
Hiroshi Murata
Assignee (at issue)
Nitto Chemical Industry 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.