Granted Patent
Utility
US 6,255,537 · App. 09/289,990
Process for preparing poly(alkylene oxide)
Inventors:
Takaomi Hayashi, Katsuhiko Funaki, Atsushi Shibahara, Kazumi Mizutani, Isao Hara, Shinji Kiyono, Tadahito Nobori, Usaji Takaki
Patented Case
View Patent ↗
Granted: Jul 3, 2001
Filed: Apr 13, 1999
Inventors
Takaomi Hayashi
Katsuhiko Funaki
Atsushi Shibahara
Kazumi Mizutani
Isao Hara
Shinji Kiyono
Tadahito Nobori
Usaji Takaki
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.