Granted Patent
Utility
US 5,428,121 · App. 08/272,868
Method for preparing syndiotactic polypropylene
Inventors:
Tadashi Asanuma, Tsutomu Iwatani, Ryuichi Sugimoto, Norihide Inoue, Masahiro Kouno, Tetsunosuke Shiomura
Patented Case
View Patent ↗
Granted: Jun 27, 1995
Filed: Jul 8, 1994
Inventors
Tadashi Asanuma
Tsutomu Iwatani
Ryuichi Sugimoto
Norihide Inoue
Masahiro Kouno
Tetsunosuke Shiomura
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.