An optical body comprising (a) a dielectric multilayer film having a reflecting band positioned to reflect infrared radiation of at least one polarization at an incident angle normal to the film, said reflecting band having a short wavelength bandedge .lambda..sub.a0 and long wavelength bandedge .lambda..sub.b0...http://www.google.es/patents/US6049419?utm_source=gb-gplus-sharePatente US6049419 - Multilayer infrared reflecting optical body
