Granted Patent
Utility
US 5,206,311 · App. 07/768,005
Blends of polyether sulfones and copolymides
Inventors:
M. Jamal El-Hibri, John L. Melquist
Patented Case
View Patent ↗
Granted: Apr 27, 1993
Filed: Sep 30, 1991
Inventors
M. Jamal El-Hibri
John L. Melquist
Assignee (at issue)
Amoco 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.