Granted Patent
Utility
US 5,643,546 · App. 08/329,185
Pitch-type carbon fibers and process for their production
Inventors:
Iwao Yamamoto, Hiroyuki Aikyo, Akihiko Yoshiya, Kazuo Shirosaki
Patented Case
View Patent ↗
Granted: Jul 1, 1997
Filed: Oct 26, 1994
Inventors
Iwao Yamamoto
Hiroyuki Aikyo
Akihiko Yoshiya
Kazuo Shirosaki
Assignee (at issue)
MITSUBISHI CHEMICAL CORPORATION
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.