Granted Patent
Utility
US 5,478,646 · App. 08/015,056
Polypropylene fiber and a preparation process thereof
Inventors:
Tadashi Asanuma, Tetsunosuke Shiomura, Shigeru Kimura, Nobutaka Uchikawa, Yoichi Kawai, Keigo Suehiro, Satoshi Fukushima
Patented Case
View Patent ↗
Granted: Dec 26, 1995
Filed: Feb 8, 1993
Inventors
Tadashi Asanuma
Tetsunosuke Shiomura
Shigeru Kimura
Nobutaka Uchikawa
Yoichi Kawai
Keigo Suehiro
Satoshi Fukushima
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.