Granted Patent
Utility
US 5,997,781 · App. 08/829,603
Injection-expansion molded, thermoplastic resin product and production process thereof
Inventors:
Shigeo Nishikawa, Kaoru Yorita, Kouzo Ichikawa, Haruo Inoue, Michio Eriguchi, Takanori Sueda, Hideo Amemiya
Patented Case
View Patent ↗
Granted: Dec 7, 1999
Filed: Mar 31, 1997
Inventors
Shigeo Nishikawa
Kaoru Yorita
Kouzo Ichikawa
Haruo Inoue
Michio Eriguchi
Takanori Sueda
Hideo Amemiya
Assignee (at issue)
MITSUI CHEMICALS, INC.
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.