I worked in Corning's S&T plant (Sullivan Park) for a number of years. Corning is all about process and the recipe may have been around for a while, but the pro

I worked in Corning's S&T plant (Sullivan Park) for a number of years. Corning is all about process and the recipe may have been around for a while, but the process surrounding getting large enough (in the case of TVs) imperfection free pieces of glass was extremely difficult and time consuming. I don't think they really 'sat on it' and 'dug it out' so much as they were able to perfect the manufacture of some of their other recipes more quickly. The glass has to be completely clear, completely flat and extremely thin - not an easy result to get at no matter what your recipe.