Granted Patent
Utility
US 5,385,998 · App. 08/191,962
Random 1-butene/ethylene copolymer
Inventors:
Masaki Kohyama, Takeshi Muranaka, Kunisuke Fukui, Norio Kashiwa
Patented Case
View Patent ↗
Granted: Jan 31, 1995
Filed: Feb 4, 1994
Inventors
Masaki Kohyama
Takeshi Muranaka
Kunisuke Fukui
Norio Kashiwa
Assignee (at issue)
Mitsui Petrochemical 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.