DH

Douglas R. S. Hart

📍 Toronto, CA: #1,335 of 9,482 inventorsTop 15%
Overall (All Time): #886,567 of 4,157,543Top 25%
6
Patents All Time

Issued Patents All Time

Showing 1–6 of 6 patents

Patent #TitleCo-InventorsDate
5927313 Valve locking device and method 1999-07-27
5806511 Method and apparatus to provide freeze protection for solar water heating systems 1998-09-15
5560124 Automatic cycle terminator for dryers David M. Jones 1996-10-01
5193292 Method and apparatus for automatically terminating the cycle in dryers David M. Jones 1993-03-16
4685615 Diagnostic thermostat 1987-08-11
4207869 Solar collector construction 1980-06-17