iceWO1997010278A19 Sep 199620 Mar 1997Basf AgMethod of preparing compact or cellular polyurethane elastomers and isocyanate prepolymers suitable thereforWO1997048138A228 May 199718 Dic 1997Philips Electronics NvVisible light emitting devices including uv-light emitting diode and uv-excitable, visible light emitting phosphor, and method of producing such devicesWO1999036248A213 Ene 199922 Jul 1999M