Granted Patent
Utility
US 5,091,500 · App. 07/588,127
Polybenzazole polymer containing perfluorocyclobutane rings
Inventors:
Zenon Lysenko, William J. Harris
Patented Case
View Patent ↗
Granted: Feb 25, 1992
Filed: Sep 21, 1990
Inventors
Zenon Lysenko
William J. Harris
Assignee (at issue)
THE DOW CHEMICAL COMPANY
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.