Granted Patent
Utility
US 4,855,455 · App. 07/146,861
Preparation of amino acid derivatives
Inventor:
Robert Kupper
Patented Case
View Patent ↗
Granted: Aug 8, 1989
Filed: Jan 22, 1988
Inventor
Robert Kupper
Assignee (at issue)
W.R. Grace & Co. Conn.
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.