Granted Patent
Utility
US 4,327,063 · App. 06/181,028
Method of purifying cyclic dichlorophosphazenes containing trace amounts of protic impurities
Inventors:
John W. Fieldhouse, Daniel F. Graves
Patented Case
View Patent ↗
Granted: Apr 27, 1982
Filed: Aug 25, 1980
Inventors
John W. Fieldhouse
Daniel F. Graves
Assignee (at issue)
The Firestone Tire & Rubber Company
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.