Granted Patent
Utility
US 5,142,021 · App. 07/600,550
Use of reducing agents in polybenzazole synthesis
Inventors:
Zenon Lysenko, Steven Rosenberg, William J. Harris
Patented Case
View Patent ↗
Granted: Aug 25, 1992
Filed: Oct 19, 1990
Inventors
Zenon Lysenko
Steven Rosenberg
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.