Granted Patent
Utility
US 4,258,173 · App. 06/083,889
Polyphosphazene polymers containing monoetheroxy and polyetheroxy substituents
Inventors:
Donald N. Schulz, Tai C. Cheng, Thomas A. Antkowiak
Patented Case
View Patent ↗
Granted: Mar 24, 1981
Filed: Oct 11, 1979
Inventors
Donald N. Schulz
Tai C. Cheng
Thomas A. Antkowiak
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.