Granted Patent
Utility
US 6,607,682 · App. 09/509,502
Pre-expanded polypropylene resin beads and process for producing molded object therefrom by in-mold foaming
Inventors:
Takema Yamaguchi, Tomonori Iwamoto, Minori Yamaguchi, Kenichi Senda
Patented Case
View Patent ↗
Granted: Aug 19, 2003
Filed: Mar 29, 2000
Inventors
Takema Yamaguchi
Tomonori Iwamoto
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.