ALEXANDRIA, Va., March 19 -- United States Patent no. 12,252,439, issued on March 18, was assigned to Schott AG (Mainz, Germany).
"Tube-drawable glass, method for the production and use" was invented by Malte Grimm (Mitterteich, Germany), Rainer Erwin Eichholz (Frankfurt am Main, Germany) and Ralf Biertumpfel (Mainz-Kastel, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A glass has a maximum crystallization rate (KGmax) of at most 0.20 micro metre/min in a temperature range of 700deg C. to 1250deg C. and a hydrolytic stability according to a hydrolytic class 1 HGA1 according to ISO 720:1985. In the case of a sample thickness of 2 mm of the glass, a ratio of a minimum transmittance in a wavelength ran...