Granted Patent
Utility
US 4,243,795 · App. 06/071,900
Polyphosphazene copolymers containing N-substituted pyrrole substituents
Inventors:
William L. Hergenrother, Adel Farhan Halasa
Patented Case
View Patent ↗
Granted: Jan 6, 1981
Filed: Sep 4, 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.