1939421

Information

• Patent Grant
• 1939421

• References
• Source

• Patent Number

  1,939,421

• Date Filed

  Not available

• Date Issued

  Tuesday, December 12, 1933
  91 years ago

• CPC

  • C23C22/67 - with solutions containing hexavalent chromium

• US Classifications

  • 148 - Metal treatment