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| US4032449 | 24 Mar 1976 | 28 Jun 1977 | S.A. Texaco Belgium N.V. | Skimmer for a body of liquid with floating solids | | US4290887 | 2 Oct 1979 | 22 Sep 1981 | | Liquid surface decanter | | US4693821 | 23 Sep 1985 | 15 Sep 1987 | Transfield, Inc. | Weir for waste water treatment systems | | US4891128 | 28 Nov 1988 | 2 Ene 1990 | Transfield, Inc. | Solids excluding surface skimmer | | US7794547 | 3 Ago 2006 | 14 Sep 2010 | | Flue pan washer for maple sugar evaporator |
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