Granted Patent
Utility
US 4,288,600 · App. 06/143,479
Preparation of 2-chloro-5-trifluoromethylpyridine and 2-chloro-5-perchlorofluoromethylpyridines
Inventors:
Norman L. Roberts, Graham Whittaker
Patented Case
View Patent ↗
Granted: Sep 8, 1981
Filed: Apr 22, 1980
Inventors
Norman L. Roberts
Graham Whittaker
Assignee (at issue)
IMPERIAL CHEMICAL INDUSTRIES 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.