To provide a heat barrier structure, for example a polyester or glass substrate (11, 21, 31) which includes a metal reflective layer (13, 25, 33) has, additionally, a dielectric cover layer applied, for example, in an argon-oxygen-nitrogen atmosphere, which forms a dielectric layer thereover which includes...http://www.google.ca/patents/US4450201?utm_source=gb-gplus-sharePatent US4450201 - Multiple-layer heat barrier
