Granted Patent
Utility
US 4,472,589 · App. 06/469,556
4-Chloro-4-chloromethyloxetan-2-one
Inventors:
John G. Dingwall, Brian Tuck
Patented Case
View Patent ↗
Granted: Sep 18, 1984
Filed: Feb 25, 1983
Inventors
John G. Dingwall
Brian Tuck
Assignee (at issue)
Ciba-Geigy
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.