Granted Patent
Utility
US 5,314,956 · App. 08/010,787
Polypropylene resin compositions of high syndiotacticity and preparation process thereof
Inventors:
Tadashi Asanuma, Tetsunosuke Shiomura, Nobutaka Uchikawa, Tutomu Iwatani, Katsumi Takeuchi
Patented Case
View Patent ↗
Granted: May 24, 1994
Filed: Jan 29, 1993
Inventors
Tadashi Asanuma
Tetsunosuke Shiomura
Nobutaka Uchikawa
Tutomu Iwatani
Katsumi Takeuchi
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.