2156597

Information

• Patent Grant
• 2156597

• References
• Source

• Patent Number

  2,156,597

• Date Filed

  Not available

• Date Issued

  Tuesday, May 2, 1939
  85 years ago

• CPC

  • C09B33/18 - Trisazo or higher polyazo dyes
  • C09B33/04 - in which the coupling component is a dihydroxy or polyhydroxy compound
  • C09B35/00 - Disazo and polyazo dyes of the type A<-D->B prepared by diazotising and coupling
  • C09B35/50 - Tetrazo dyes

• US Classifications

  • 534 - Organic compounds