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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
First Claim
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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.

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