Granted Patent
Utility
US 4,513,574 · App. 06/605,272
Low Temperature air conditioning system and method
Inventors:
Norman G. Humphreys, Raymond H. Dean
Patented Case
View Patent ↗
Granted: Apr 30, 1985
Filed: Apr 30, 1984
Inventors
Norman G. Humphreys
Raymond H. Dean
Assignee (at issue)
Tempmaster Corporation
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.