Granted Patent
Utility
US 5,622,756 · App. 08/439,785
Expansion-molded article of polyolefin resin having open voids
Inventors:
Hisao Tokoro, Satoru Shioya, Akira Hinokawa
Patented Case
View Patent ↗
Granted: Apr 22, 1997
Filed: May 12, 1995
Inventors
Hisao Tokoro
Satoru Shioya
Akira Hinokawa
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.