Douwe Ybema — 2 Patents at Cominco

Douwe Ybema has been granted 2 US patents while listed as an inventor at Cominco. The first was granted in 1982 and the most recent in October 1984. Douwe Ybema ranks #1,709,992 of 4,157,543 US inventors in our database (top 41.1%). Patent records list Douwe Ybema in Trail, BC, CA.

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #	Title	Co-Inventors	Date	Approx Value ⓘ
4479863	Cell top insulator	Ronald N. Honey, Robert E. Manwell, Clifford J. Krauss	1984-10-30	$2,151,000
4345980	Electrowinning of zinc	Richard T. Chow, Clifford J. Krauss	1982-08-24	$4,289,000

Douwe Ybema — 2 Patents

Issued Patents All Time

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