Granted Patent
Utility
US 4,258,161 · App. 06/005,471
Process for polymerizing propylene
Inventors:
Genjiro Kakogawa, Masayoshi Hasuo, Yoshinori Suga, Hisashi Kitada, Yumito Uehara
Patented Case
View Patent ↗
Granted: Mar 24, 1981
Filed: Jan 22, 1979
Inventors
Genjiro Kakogawa
Masayoshi Hasuo
Yoshinori Suga
Hisashi Kitada
Yumito Uehara
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.