Legal status (The legal status 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 status listed.)
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BACCARAT CRISTALLERIES
CHAUMEIL GUILLAUME
Original Assignee
BACCARAT CRISTALLERIES
CHAUMEIL GUILLAUME
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Filing date
Publication date
Application filed by BACCARAT CRISTALLERIES, CHAUMEIL GUILLAUMEfiledCriticalBACCARAT CRISTALLERIES
Priority to FR6923948ApriorityCriticalpatent/FR2053679A5/en
Application grantedgrantedCritical
Publication of FR2053679A5publicationCriticalpatent/FR2053679A5/en
C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
C03B27/00—Tempering or quenching glass products
C03B27/02—Tempering or quenching glass products using liquid
Abstract
Lamp glass partic. for a miners lamp is annealed by preheating this to a specific temp. and quenching it in a sand bath and while this is covered by the sand, immersing it in a cooling liquid such as water but without allowing the water to come into direct contact with it. The preheating is progressive up to ca. 670 degrees C and the hot lamp glass is subjected to a vertical drop to eliminate any deformation when it is placed in the annealing mould.