As I stated above, Corningware was invented by S. Donald Stookey in the early 1950s. The material used in designing Corningware is made of pyroceram which is a ceramic-glass material.
This material could withstand very high temperatures, making it a good choice for kitchenware and other uses. If you look at your Corningware dish bottom and it says "not for stovetop" then it is not Pyroceram.
The new and classic Corningware dishes today are made from both Pyroceram and ceramic stoneware, therefore, it is important you know the material your Corningware brand is made of before using it to avoid any issue.