Granted Patent
Utility
US 5,203,366 · App. 07/831,564
Apparatus and method for mixing and dispensing chemical concentrates at point of use
Inventors:
Stephen J. Czeck, Douglas Sherwin Hoerning, Richard J. Mehus, Timothy A. Gutzmann, Richard Ruhr
Patented Case
View Patent ↗
Granted: Apr 20, 1993
Filed: Feb 5, 1992
Inventors
Stephen J. Czeck
Douglas Sherwin Hoerning
Richard J. Mehus
Timothy A. Gutzmann
Richard Ruhr
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.