Granted Patent
Utility
US 4,847,350 · App. 06/868,396
Preparation of aromatic heterocyclic polymers
Inventor:
William J. Harris
Patented Case
View Patent ↗
Granted: Jul 11, 1989
Filed: May 27, 1986
Inventor
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.