1922481

Information

• Patent Grant
• 1922481

• References
• Source

• Patent Number

  1,922,481

• Date Filed

  Not available

• Date Issued

  Tuesday, August 15, 1933
  91 years ago

• CPC

  • C09B3/54 - Preparation from starting materials already containing the dibenzopyrenequinone nucleus

• US Classifications

  • 552 - Organic compounds