Granted Patent
Utility
US 5,389,344 · App. 08/131,653
Variable concentration, solid chemical dispenser
Inventors:
James L. Copeland, John E. Thomas, Daniel K. Boche, James D. Decker, Daniel F. Brady
Patented Case
View Patent ↗
Granted: Feb 14, 1995
Filed: Oct 5, 1993
Inventors
James L. Copeland
John E. Thomas
Daniel K. Boche
James D. Decker
Daniel F. Brady
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.