1861921

Information

• Patent Grant
• 1861921

• References
• Source

• Patent Number

  1,861,921

• Date Filed

  Not available

• Date Issued

  Tuesday, June 7, 1932
  92 years ago

• CPC

  • C09B5/002 - the heterocyclic rings being condensed in peri position and in 1-2 or 2-3 position
  • C07D471/06 - Peri-condensed systems

• US Classifications

  • 546 - Organic compounds