Granted Patent
Utility
US 6,187,434 · App. 09/534,259
Pitch fiber bundle and pitch type carbon fiber bundle and method for production thereof
Inventors:
Yutaka Arai, Yoshiyuki Doken, Tsutomu Nakamura
Patented Case
View Patent ↗
Granted: Feb 13, 2001
Filed: Mar 24, 2000
Inventors
Yutaka Arai
Yoshiyuki Doken
Tsutomu Nakamura
Assignees (at issue)
NIPPON STEEL CORPORATION
Nippon Mitsubishi Oil Corp
Nippon Graphite Fiber 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.