Granted Patent
Utility
US 5,288,445 · App. 07/985,068
Rapid heat-treatment method for polybenzaole fiber
Inventors:
Katsuya Tani, Steven Rosenberg, Willard E. Alexander, Chieh-Chun Chau
Patented Case
View Patent ↗
Granted: Feb 22, 1994
Filed: Dec 3, 1992
Inventors
Katsuya Tani
Steven Rosenberg
Willard E. Alexander
Chieh-Chun Chau
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.