Granted Patent
Utility
US 5,283,357 · App. 07/688,709
Separation method of .alpha.-l-aspartyl-l-phenylalanine methyl ester
Inventors:
Toshio Katoh, Chojiro Higuchi, Takeshi Oura, Masanobu Ajioka, Akihiro Yamaguchi
Patented Case
View Patent ↗
Granted: Feb 1, 1994
Filed: Apr 23, 1991
Inventors
Toshio Katoh
Chojiro Higuchi
Takeshi Oura
Masanobu Ajioka
Akihiro Yamaguchi
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.