Granted Patent
Utility
US 4,769,474 · App. 06/847,194
Process for purifying tryptophane
Inventors:
Shoichiro Miyahara, Toshio Matsumoto, Tooru Miyahara, Kazunari Nitta
Patented Case
View Patent ↗
Granted: Sep 6, 1988
Filed: Apr 2, 1986
Inventors
Shoichiro Miyahara
Toshio Matsumoto
Tooru Miyahara
Kazunari Nitta
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.