Granted Patent
Utility
US 4,335,209 · App. 06/145,267
Process for preparation of L-tryptophan by enzyme
Inventors:
Yoshiyuki Asai, Masao Shimada, Kenji Soda
Patented Case
View Patent ↗
Granted: Jun 15, 1982
Filed: Apr 25, 1980
Inventors
Yoshiyuki Asai
Masao Shimada
Kenji Soda
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.