Granted Patent
Utility
US 6,428,891 · App. 09/743,811
Acrylonitrile-based precursor fiber for carbon fiber and method for production thereof
Inventors:
Takahiro OKUYA, Mitsuo Hamada, Yoshitaka Kageyama, Takeaki Amakawa
Patented Case
View Patent ↗
Granted: Aug 6, 2002
Filed: Jan 22, 2001
Inventors
Takahiro OKUYA
Mitsuo Hamada
Yoshitaka Kageyama
Takeaki Amakawa
Assignee (at issue)
MITSUBISHI ELECTRIC 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.