Granted Patent
Utility
US 5,312,972 · App. 07/969,705
Conversion of hydroxymethyl-iminodiacetic acid to phosphonomethyl-iminodiacetic acid
Inventor:
Barry A. Cullen
Patented Case
View Patent ↗
Granted: May 17, 1994
Filed: Oct 29, 1992
Inventor
Barry A. Cullen
Assignee (at issue)
Hampshire Chemical Corp.
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.