1909690

Information

• Patent Grant
• 1909690

• References
• Source

• Patent Number

  1,909,690

• Date Filed

  Not available

• Date Issued

  Tuesday, May 16, 1933
  91 years ago

• CPC

  • C09B3/22 - Dibenzanthrones Isodibenzanthrones

• US Classifications

  • 546 - Organic compounds
  • 544 - Organic compounds
  • 548 - Organic compounds
  • 552 - Organic compounds