Granted Patent
Utility
US 4,710,549 · App. 06/885,651
Cross-linked phosphazene polymer
Inventor:
F. Alexander Pettigrew
Patented Case
View Patent ↗
Granted: Dec 1, 1987
Filed: Jul 14, 1986
Inventor
F. Alexander Pettigrew
Assignee (at issue)
Ethyl Corporation
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.