Granted Patent
Utility
US 5,273,823 · App. 07/547,650
Shaped articles containing copolymers of polybenzazoles
Inventors:
Wen-Fang Hwang, Otto C. Raspor, William J. Harris, Thuan P. Dixit
Patented Case
View Patent ↗
Granted: Dec 28, 1993
Filed: Jul 2, 1990
Inventors
Wen-Fang Hwang
Otto C. Raspor
William J. Harris
Thuan P. Dixit
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.