Granted Patent
Utility
US 4,656,246 · App. 06/840,096
Polyetheroxy-substituted polyphosphazene purification
Inventors:
Suae-Chen Chang, Joseph B. Tedder, Jr., J. Robert Adams, Jr.
Patented Case
View Patent ↗
Granted: Apr 7, 1987
Filed: Mar 17, 1986
Inventors
Suae-Chen Chang
Joseph B. Tedder, Jr.
J. Robert Adams, Jr.
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.