Granted Patent
Utility
US 4,258,170 · App. 06/067,985
Polyphosphazene polymers containing pyrazole or imidazole substituents
Inventors:
William L. Hergenrother, Adel Farhan Halasa
Patented Case
View Patent ↗
Granted: Mar 24, 1981
Filed: Aug 20, 1979
Inventors
William L. Hergenrother
Adel Farhan Halasa
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.