2189503

Information

• Patent Grant
• 2189503

• References
• Source

• Patent Number

  2,189,503

• Date Filed

  Not available

• Date Issued

  Tuesday, February 6, 1940
  85 years ago

• CPC

  • C09B5/34 - Anthraquinone acridones or thioxanthrones

• US Classifications

  • 546 - Organic compounds