Granted Patent
Utility
US 5,073,284 · App. 07/624,877
Phosphonitrilic mixed esters
Inventors:
W. Dirk Klobucar, Charles H. Kolich
Patented Case
View Patent ↗
Granted: Dec 17, 1991
Filed: Dec 5, 1990
Inventors
W. Dirk Klobucar
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.