Granted Patent
Utility
US 4,897,506 · App. 07/256,838
Isolation of alpha-l-aspartyl-l-phenylalanine methyl ester from aqueous medium
Inventors:
Ryuichi Mita, Takeshi Oura, Toshio Katoh, Chojiro Higuchi, Akihiro Yamaguchi, Masanobu Ajioka
Patented Case
View Patent ↗
Granted: Jan 30, 1990
Filed: Oct 12, 1988
Inventors
Ryuichi Mita
Takeshi Oura
Toshio Katoh
Chojiro Higuchi
Akihiro Yamaguchi
Masanobu Ajioka
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.