Granted Patent
Utility
US 4,846,993 · App. 07/217,378
Zero phosphate warewashing detergent composition
Inventors:
Steven E. Lentsch, Thomas R. Oakes
Patented Case
View Patent ↗
Granted: Jul 11, 1989
Filed: Jul 11, 1988
Inventors
Steven E. Lentsch
Thomas R. Oakes
Assignee (at issue)
ECOLAB INC.
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.