Granted Patent
Utility
US 5,941,275 · App. 08/669,147
Pump for periodic conveyance of the cooled-down water content of a hot water distribution line
Inventor:
Karsten Laing
Patented Case
View Patent ↗
Granted: Aug 24, 1999
Filed: Jun 24, 1996
Inventor
Karsten Laing
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.