Granted Patent
Utility
US 5,159,110 · App. 07/782,847
Process for recovering N-methyliminodiacetic acid from sodium sulfate
Inventor:
Jon C. Thunberg
Patented Case
View Patent ↗
Granted: Oct 27, 1992
Filed: Oct 24, 1991
Inventor
Jon C. Thunberg
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.