3656721

Information

• Patent Grant
• 3656721

• References
• Source

• Patent Number

  3,656,721

• Date Filed

  Not available

• Date Issued

  Tuesday, April 18, 1972
  53 years ago

• CPC

  • C21B9/06 - Linings
  • F28F21/04 - of ceramic of concrete of natural stone

• US Classifications

  • 432 - Heating