Granted Patent
Utility
US 4,229,558 · App. 06/071,388
Process for preparing polyolefin
Inventors:
Genjiro Kakogawa, Masayoshi Hasuo, Yoshinori Suga, Hisashi Kitada
Patented Case
View Patent ↗
Granted: Oct 21, 1980
Filed: Aug 30, 1979
Inventors
Genjiro Kakogawa
Masayoshi Hasuo
Yoshinori Suga
Hisashi Kitada
Assignee (at issue)
Mitsubishi Chemical Industries, Ltd.
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.