Granted Patent
Utility
US 4,241,034 · App. 06/044,309
Process for purifying cyclic phosphonitrilic chlorides
Inventor:
Charles H. Kolich
Patented Case
View Patent ↗
Granted: Dec 23, 1980
Filed: May 31, 1979
Inventor
Charles H. Kolich
Assignee (at issue)
Ethyl Corporation
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.