Granted Patent
Utility
US 4,670,129 · App. 06/853,579
Pitch for production of carbon fibers
Inventors:
Kazuhito Tate, Hajime Yoshida, Kazuhiro Yanagida
Patented Case
View Patent ↗
Granted: Jun 2, 1987
Filed: Apr 18, 1986
Inventors
Kazuhito Tate
Hajime Yoshida
Kazuhiro Yanagida
Assignee (at issue)
Mitsubishi Oil Co., 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.