Granted Patent
Utility
US 6,667,416 · App. 09/912,312
Method and apparatus for producing polyester polyol, polyester polyol and polyurethane foam
Inventors:
Kouichi Murayama, Katsumi Inaoka, Takashi Kumaki
Patented Case
View Patent ↗
Granted: Dec 23, 2003
Filed: Jul 26, 2001
Inventors
Kouichi Murayama
Katsumi Inaoka
Takashi Kumaki
Assignee (at issue)
Mitsui Takeda 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.