Granted Patent
Utility
US 5,641,548 · App. 08/301,440
Blow molded articles
Inventors:
Kazuhito Yamamoto, Hiroji Niimi, Yoji Yamamoto, Susumu Hatabu
Patented Case
View Patent ↗
Granted: Jun 24, 1997
Filed: Sep 9, 1994
Inventors
Kazuhito Yamamoto
Hiroji Niimi
Yoji Yamamoto
Susumu Hatabu
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.