Granted Patent
Utility
US 5,300,581 · App. 07/773,650
Process for producing thermoplastic elastomer
Inventors:
Yasuhiko Otawa, Katsuo Okamoto, Mamoru Kioka, Takashi Ueda
Patented Case
View Patent ↗
Granted: Apr 5, 1994
Filed: Oct 18, 1991
Inventors
Yasuhiko Otawa
Katsuo Okamoto
Mamoru Kioka
Takashi Ueda
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.