ALEXANDRIA, Va., Dec. 18 -- Hiromasa Tominaga of Tokyo, and Kazushige Yoda of Aichi, Japan, have developed an automobile Tempered Glass sheet.

According to the U.S. Patent & Trademark Office: "A Tempered Glass sheet having in its front view a peripheral region including the peripheries, and a central region occupying inside the peripheral region, wherein the average surface compressive stress in the central region is larger than the average surface compressive stress in the peripheral region, is presented, whereby a tempered glass sheet having a thickness thinner than conventional ones can be provided.

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Tempered Glass