Granted Patent
Utility
US 4,582,662 · App. 06/613,070
Process for producing a carbon fiber from pitch material
Inventors:
Shinichiro Koga, Taizo Okajima, Shigeya Yamaguchi, Eisaku Kakikura
Patented Case
View Patent ↗
Granted: Apr 15, 1986
Filed: May 22, 1984
Inventors
Shinichiro Koga
Taizo Okajima
Shigeya Yamaguchi
Eisaku Kakikura
Assignee (at issue)
Mitsubishi Chemical Industries, Ltd.
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.