Granted Patent
Utility
US 6,117,937 · App. 09/028,525
Polymer polyol and flame retardant polyurethane resin and foam prepared therefrom
Inventors:
Shinsuke Matsumoto, Ariko Nishikawa, Tsukuru Izukawa, Masahiro Isobe, Kazuhiko Okubo
Patented Case
View Patent ↗
Granted: Sep 12, 2000
Filed: Feb 24, 1998
Inventors
Shinsuke Matsumoto
Ariko Nishikawa
Tsukuru Izukawa
Masahiro Isobe
Kazuhiko Okubo
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.