1991687

Information

• Patent Grant
• 1991687

• References
• Source

• Patent Number

  1,991,687

• Date Filed

  Not available

• Date Issued

  Tuesday, February 19, 1935
  90 years ago

• CPC

  • C09B3/00 - Dyes with an anthracene nucleus condensed with one or more carbocyclic rings
  • C07C63/46 - containing two carboxyl groups both bound to carbon atoms of the condensed ring system

• US Classifications

  • 552 - Organic compounds