Granted Patent
Utility
US 5,385,044 · App. 08/112,579
Method of using a thermo-chromatic detergent level indicator
Inventors:
John E. Thomas, Jody A. Toetschinger, John E. McCall, Jr.
Patented Case
View Patent ↗
Granted: Jan 31, 1995
Filed: Aug 25, 1993
Inventors
John E. Thomas
Jody A. Toetschinger
John E. McCall, Jr.
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.