Granted Patent
Utility
US 5,633,408 · App. 08/493,804
Process for preparing alkanolamines
Inventors:
Hiroyoshi Watanabe, Mutsuo Matsumura, Takashi Ohkawa, Kenji Suzuki
Patented Case
View Patent ↗
Granted: May 27, 1997
Filed: Jun 22, 1995
Inventors
Hiroyoshi Watanabe
Mutsuo Matsumura
Takashi Ohkawa
Kenji Suzuki
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.