Granted Patent
Utility
US 4,497,181 · App. 06/503,806
Means to measure, indicate and regulate thickness of ice layer in refrigeration system
Inventors:
Erich J. Kocher, John K. Kopp
Patented Case
View Patent ↗
Granted: Feb 5, 1985
Filed: Jun 13, 1983
Inventors
Erich J. Kocher
John K. Kopp
Assignee (at issue)
Vilter Manufacturing LLC
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.