Granted Patent
Utility
US 6,077,875 · App. 09/274,345
Foamed and expanded beads of polypropylene resin for molding
Inventors:
Hidehiro Sasaki, Masakazu Sakaguchi, Mitsuhiro Akiyama, Hisao Tokoro
Patented Case
View Patent ↗
Granted: Jun 20, 2000
Filed: Mar 23, 1999
Inventors
Hidehiro Sasaki
Masakazu Sakaguchi
Mitsuhiro Akiyama
Hisao Tokoro
Assignee (at issue)
JSP 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.