3400021

Information

• Patent Grant
• 3400021

• References
• Source

• Patent Number

  3,400,021

• Date Filed

  Not available

• Date Issued

  Tuesday, September 3, 1968
  56 years ago

• CPC

  • C23C22/83 - Chemical after-treatment
  • C23C22/24 - containing hexavalent chromium compounds
  • C23C22/33 - containing also phosphates
  • C23C22/43 - containing also hexavalent chromium compounds

• US Classifications

  • 148 - Metal treatment