Patent ID: 7781055

Claim:
A transparent heat shielding multilayer structure, comprising a transparent base film; a first transparent heat shielding layer with a first radiation absorbing nanoparticle consisting of lanthanum hexaboride (LaB 6 ) dispersed therein, wherein the first transparent heat shielding layer is free from nanoparticles of antimony doped tin oxide (ATO), indium tin oxide (ITO), and metal doped tungsten oxide; and a second transparent heat shielding layer with nanoparticles a second radiation absorbing nanoparticle selected from the group consisting of antimony doped tin oxide (ATO), indium tin oxide (ITO), Li, Na, K or Rb doped tungsten oxide dispersed therein, wherein the second transparent heat shielding layer is free from nanoparticles of lanthanum hexaboride LaB 6 and Cs dosed tungsten oxide, wherein the first and the second transparent heat shielding layers are disposed on the same side or opposite sides of the transparent base film.