Granted Patent
Utility
US 5,204,400 · App. 07/542,744
Poly(biphenyl ether sulfone)compositions
Inventors:
W. E. Kelly, S. R. Patel, M. Matzner
Patented Case
View Patent ↗
Granted: Apr 20, 1993
Filed: Jun 22, 1990
Inventors
W. E. Kelly
S. R. Patel
M. Matzner
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.