Granted Patent
Utility
US 5,605,818 · App. 08/424,621
Process for producing L-tryptophan, L-tyrosine or L-phenylalanine
Inventors:
Ryoichi Katsumata, Masato Ikeda
Patented Case
View Patent ↗
Granted: Feb 25, 1997
Filed: Apr 19, 1995
Inventors
Ryoichi Katsumata
Masato Ikeda
Assignee (at issue)
KYOWA HAKKO KOGYO CO., LTD.
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.