Granted Patent
Utility
US 4,346,567 · App. 06/117,076
Heat pump control valve
Inventor:
David H. Sniader
Patented Case
View Patent ↗
Granted: Aug 31, 1982
Filed: Jan 31, 1980
Inventor
David H. Sniader
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.