Granted Patent
Utility
US 4,421,853 · App. 06/388,760
Fermentative preparation of L-leucine
Inventors:
Mark H. Updike, Gary J. Calton
Patented Case
View Patent ↗
Granted: Dec 20, 1983
Filed: Jun 16, 1982
Inventors
Mark H. Updike
Gary J. Calton
Assignee (at issue)
W. R. Grace & Co.
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.