Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Publication of NL77968CpublicationCriticalpatent/NL77968C/xx
C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
C03B25/00—Annealing glass products
C—CHEMISTRY; METALLURGY
C03—GLASS; MINERAL OR SLAG WOOL
C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
C03B27/00—Tempering or quenching glass products
C03B27/012—Tempering or quenching glass products by heat treatment, e.g. for crystallisation; Heat treatment of glass products before tempering by cooling