Granted Patent
Utility
US 6,303,815 · App. 09/548,624
Process for preparing phosphine oxides and process for purifying the same
Inventors:
Tadahito Nobori, Isao Hara, Katsuhiko Funaki, Takaomi Hayashi, Atsushi Shibahara, Shinji Kiyono, Kazumi Mizutani, Usaji Takaki
Patented Case
View Patent ↗
Granted: Oct 16, 2001
Filed: Apr 13, 2000
Inventors
Tadahito Nobori
Isao Hara
Katsuhiko Funaki
Takaomi Hayashi
Atsushi Shibahara
Shinji Kiyono
Kazumi Mizutani
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.