Granted Patent
Utility
US 6,276,148 · App. 09/505,584
Boosted air source heat pump
Inventor:
David N. Shaw
Patented Case
View Patent ↗
Granted: Aug 21, 2001
Filed: Feb 16, 2000
Inventor
David N. Shaw
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.