Granted Patent
Utility
US 5,041,660 · App. 07/602,391
Novel alpha-chloroketone derivative and process for preparation thereof
Inventors:
Keiichi Yokoyama, Yoshio Noguchi, Noriaki Kihara
Patented Case
View Patent ↗
Granted: Aug 20, 1991
Filed: Oct 24, 1990
Inventors
Keiichi Yokoyama
Yoshio Noguchi
Noriaki Kihara
Assignee (at issue)
Mitsui Petrochemical 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.