Patent ID: 8003233

Claim:
An oven transparency, comprising: a first panel having a first major surface and a second major surface; a second panel spaced from the first panel and having a first major surface and a second major surface, with the first major surface of the second panel facing the second major surface of the first panel; a first coating deposited over at least a portion of the second major surface of the second panel, the first coating consisting essentially of at least one metal oxide layer; and a second coating deposited over at least a portion of one of the second major surface of the first panel or the first major surface of the second panel, the second coating comprising: a first dielectric layer comprising at least one transparent metal oxide; a first metallic layer; a second dielectric layer comprising at least one transparent metal oxide; and a second metallic layer; and a protective coating over the second coating and comprising a mixture of silica and alumina and having a thickness in the range of 100 Å to 50,000 Å.