Granted Patent
Utility
US 4,285,204 · App. 06/125,712
Defrosting problem areas of refrigerated display cases
Inventor:
John H. Vana
Patented Case
View Patent ↗
Granted: Aug 25, 1981
Filed: Feb 28, 1980
Inventor
John H. Vana
Assignee (at issue)
Emhart Industries, 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.