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Patentes

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Patente citante Fecha de presentación Fecha de emisión Cesionario original Título
US395320920 Ago 197327 Abr 1976RCA CorporationMethod for preparing supplemental filter for lighthouse
US451404023 Feb 198330 Abr 1985Societa' Italiana Vetro-Siv-S.p.A.Prismatic refractor for concentrating solar energy on a suitable collecting surface, of fixed position with respect to time
US460926620 Ago 19842 Sep 1986Roxor CorporationElimination of internal reflections and diffractions from junctures in and at the periphery of, a segmented mirror
US462189817 Mar 198311 Nov 1986Allied CorporationDirectional optical filter
US463090518 Nov 198523 Dic 1986Roxor CorporationElimination of internal reflections and diffractions from junctures in, and at the periphery of, a segmented mirror
US463252415 Nov 198530 Dic 1986Roxor CorporationElimination of internal reflections and diffractions from junctures in, and at the periphery of a segmented mirror
US464193315 Nov 198510 Feb 1987Roxor CorporationElimination of internal reflections and diffractions from junctures in, and at the periphery of, a segmented mirror
US467485018 Nov 198523 Jun 1987Roxor CorporationElimination of internal reflections and diffractions from junctures in, and at the periphery of, a segmented mirror
US575138728 Jul 199512 May 1998Fujitsu LimitedFresnel lens and liquid crystal display device
US580188929 Abr 19961 Sep 1998Eastman Kodak CompanyTechnique to eliminate scattered light in diffractive optical elements
US621193211 Abr 20003 Abr 2001Fujitsu LimitedFresnel lens and liquid crystal display device
US631073331 Dic 199630 Oct 2001Optical elements and methods for their manufacture
USH42320 May -18The United States of America as represented by the Secretary of the NavyFresnel lens in an improved infinity image display system