Ralph S. Robertson — 2 Patents at Keltech

Ralph S. Robertson has been granted 2 US patents while listed as an inventor at Keltech. The first was granted in 1990 and the most recent in August 1992. Ralph S. Robertson ranks #1,709,992 of 4,157,543 US inventors in our database (top 41.1%). Patent records list Ralph S. Robertson in Delton, MI, US.

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #	Title	Co-Inventors	Date	Approx Value ⓘ
5136469	Powered surgical handpiece incorporating sealed multi semiconductor motor control package	Steven J. Carusillo, John M. Izenbaard	1992-08-04	$9,755,000
4970373	Electronic temperature control system for a tankless water heater	Kenneth E. Lutz, II	1990-11-13

Ralph S. Robertson — 2 Patents

Issued Patents All Time

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