Granted Patent
Utility
US 4,878,972 · App. 07/233,541
Process for preparing two-ply foam molded articles
Inventors:
Katsutoshi Kaneko, Toshio Kobayashi, Mitsuru Watari
Patented Case
View Patent ↗
Granted: Nov 7, 1989
Filed: Aug 18, 1988
Inventors
Katsutoshi Kaneko
Toshio Kobayashi
Mitsuru Watari
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.