3390021

Information

• Patent Grant
• 3390021

• References
• Source

• Patent Number

  3,390,021

• Date Filed

  Not available

• Date Issued

  Tuesday, June 25, 1968
  56 years ago

• CPC

  • C22F1/008 - Using a protective surface layer
  • C03C3/14 - containing boron
  • C03C3/145 - containing aluminium or beryllium
  • C21D1/44 - in heat-treatment baths
  • C21D1/70 - while heating or quenching

• US Classifications

  • 148 - Metal treatment
  • 501 - Compositions: ceramic