Granted Patent
Utility
US 4,223,162 · App. 05/945,972
Ether carboxylates containing three carboxylate groups
Inventors:
Marvin M. Crutchfield, Kent P. Lannert, Charles J. Upton
Patented Case
View Patent ↗
Granted: Sep 16, 1980
Filed: Sep 26, 1978
Inventors
Marvin M. Crutchfield
Kent P. Lannert
Charles J. Upton
Assignee (at issue)
Monsanto Company
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.