Chemically toughened glasses

  • US 6,518,211 B1
  • Filed: 09/14/2000
  • Issued: 02/11/2003
  • Est. Priority Date: 03/20/1998
  • Status: Expired due to Term
First Claim
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1. A boron-free float glass having a density which is less than 2.48 g/cm3 and a composition capable of being chemically strengthened over a period of less than 100 hours to exhibit a surface stress of at least 400 Mpa with a depth of ion penetration greater than 200 microns comprising:

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