Granted Patent
Utility
US 4,167,102 · App. 05/868,089
Refrigeration system utilizing saturated gaseous refrigerant for defrost purposes
Inventor:
Benjamin R. Willitts
Patented Case
View Patent ↗
Granted: Sep 11, 1979
Filed: Jan 9, 1978
Inventor
Benjamin R. Willitts
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.