Granted Patent
Utility
US 6,355,696 · App. 09/238,169
Polypropylene resin pre-expanded particles
Inventors:
Takema Yamaguchi, Minori Yamaguchi, Kenichi Senda
Patented Case
View Patent ↗
Granted: Mar 12, 2002
Filed: Jan 28, 1999
Inventors
Takema Yamaguchi
Minori Yamaguchi
Kenichi Senda
Assignee (at issue)
KANEKA CORPORATION
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.