Granted Patent
Utility
US 5,169,924 · App. 07/556,995
Copolymer of propylene and butene-1
Inventors:
Tadashi Asanuma, Tetsunosuke Shiomura, Tateyo Sasaki, Tutomu Iwatani, Nobutaka Uchikawa
Patented Case
View Patent ↗
Granted: Dec 8, 1992
Filed: Jul 25, 1990
Inventors
Tadashi Asanuma
Tetsunosuke Shiomura
Tateyo Sasaki
Tutomu Iwatani
Nobutaka Uchikawa
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.