Pyrex patent | Techday, May 27th
On this TECHDAY, May 27th 1919 marks the registration of a U.S. patent of Pyrex (No. 1304623). Its inventors were company research chemists who handed the patent to Corning Glass Works. Pyrex was their trademark for their sodium borosilicate glass. This glass has an exceptionally high resistance to thermal shock, and is heat and break resistant. The output of the original patent meant to include such practical products as glass baking dishes and laboratory ware. There are many beneficial properties of the composition of this glass. It includes low linear thermal expansivity and a relatively high coefficient of thermal conductivity, which are both useful for heat insulation and can resist chemical attack.
In 1998, Corning Inc. sold the Pyrex brand to World Kitchen, LLC, which still markets and sells Pyrex products today.
Today, Pyrex remains a well-known and respected brand of borosilicate glassware known for its durability and heat resistance. Even though the formula changed over the years, the Pyrex glassware still maintains its characteristics that were patented in 1919.
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Author: PC-GR
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