Ceramic product and process of producing it

• US 3,243,335 A
• Filed: 03/13/1963
• Issued: 03/29/1966
• Est. Priority Date: 03/13/1963
• Status: Expired due to Term

• Current Assignee: Samuel P. Faile
• Original Assignee: Samuel P. Faile
• Inventors: Faile, Samuel P.
• Application Number:
  US04/264,752
• Time in Patent Office: 1,112 Days
• US Class Current: 428/410
• CPC Class Codes: C03B 27/012 by heat treatment, e.g. for crystallisation; Heat treatment of glass products before tempering by cooling C03B27/008, C03B27/016 take precedence
• CPC Class Codes: C03C 10/00 Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
• CPC Class Codes: Y10T 428/315 Surface modified glass [e.g., tempered, strengthened, etc.]

Claims

1. THE METHOD OF PRODUCING A CERAMIC PRODUCT WITH A SURFACE UNDER HIGH COMPRESSIONAL STRESS WHICH INCLUDES HEATING A GLASS COMPOSITION CONTAINING A NUCLEATING AGENT BY CREATING DIELECTRIC LOSSES WITHIN IT THEREBY HEATING THE GLASS INTERALLY TO CREATE A TEMPERATURE SUFFICIENT TO CAUSE THE DEVITRIFICATION OF AN INCREASE IN THE ANNEALING POINT AND COEFFICIENT OF EXPANSION OF THE INTERIOR OF SAID PROUDCT AND COOLING ITS SURFACE TO MAINTAIN THE SURFACE BELOW APPROXIMATELY THE ANNEALING TEMPERATURE OF THE GLASS COMPOSITION WHILE IT IS BEING SO HEATED.

6. THE PRODUCT PRODUCED BY THE METHOD OF CLAIM 1.