Granted Patent
Utility
US 6,063,825 · App. 09/136,307
Flexible polyurethane foam with high durability
Inventors:
Masahiro Isobe, Kazuhiko Ohkubo, Seijiro Sakai, Usaji Takaki, Tadahito Nobori, Tsukuru Izukawa, Satoshi Yamasaki
Patented Case
View Patent ↗
Granted: May 16, 2000
Filed: Aug 19, 1998
Inventors
Masahiro Isobe
Kazuhiko Ohkubo
Seijiro Sakai
Usaji Takaki
Tadahito Nobori
Tsukuru Izukawa
Satoshi Yamasaki
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.