Granted Patent
Utility
US 4,123,503 · App. 05/771,221
Catalysis of phosphazene cyclics to polymer, using Lewis acid compounds
Inventors:
Dennis Snyder, Mark L. Stayer, Jr., Jung W. Kang
Patented Case
View Patent ↗
Granted: Oct 31, 1978
Filed: Mar 23, 1977
Inventors
Dennis Snyder
Mark L. Stayer, Jr.
Jung W. Kang
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.