Donald B. Ketcham — 1 Patent at 3M

Donald B. Ketcham has been granted 1 US patent while listed as an inventor at 3M. All of these patents were granted in 1995. Donald B. Ketcham ranks #2,406,284 of 4,157,543 US inventors in our database (top 57.9%). Patent records list Donald B. Ketcham in Lakeville, MN, US.

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #	Title	Co-Inventors	Date	Approx Value ⓘ
5420742	Degausser for tape with plural recorded segments	Robert P. McCollam, Kent Kalar	1995-05-30	$9,184,000

Donald B. Ketcham — 1 Patent

Issued Patents All Time

Patent Widget