Granted Patent
Utility
US 4,698,439 · App. 06/862,000
Mixed esters of polyphosphazenes
Inventors:
Charles H. Kolich, W. Dirk Klobucar
Patented Case
View Patent ↗
Granted: Oct 6, 1987
Filed: May 12, 1986
Inventors
Charles H. Kolich
W. Dirk Klobucar
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.