Granted Patent
Utility
US 5,218,076 · App. 07/849,628
Branch polybenzazole polymer and method of preparation
Inventors:
Norman L. Madison, William J. Harris
Patented Case
View Patent ↗
Granted: Jun 8, 1993
Filed: Mar 11, 1992
Inventors
Norman L. Madison
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.