Granted Patent
Utility
US 4,378,680 · App. 06/309,749
Shell and tube ice-maker with hot gas defrost
Inventor:
Milton W. Garland
Patented Case
View Patent ↗
Granted: Apr 5, 1983
Filed: Oct 8, 1981
Inventor
Milton W. Garland
Assignee (at issue)
Frick Company
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.