Granted Patent
Utility
US 5,124,432 · App. 07/401,346
Branched polybenzazole polymer and method of preparation
Inventors:
Norman L. Madison, William J. Harris
Patented Case
View Patent ↗
Granted: Jun 23, 1992
Filed: Aug 31, 1989
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.