3639642

Information

• Patent Grant
• 3639642

• References
• Source

• Patent Number

  3,639,642

• Date Filed

  Not available

• Date Issued

  Tuesday, February 1, 1972
  53 years ago

• CPC

  • C07D239/06 - having one double bond between ring members or between a ring member and a non-ring member
  • C07D233/06 - with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, directly attached to ring carbon atoms
  • C07D233/26 - Radicals substituted by carbon atoms having three bonds to hetero atoms
  • C07D243/04 - having the nitrogen atoms in positions 1,3
  • D06L3/1285 - Fugitive optical brightening, organic blueing, discharge of optical brighteners, optical brighteners in discharge pastes, differential optical brightening

• US Classifications

  • 162 - Paper making and fiber liberation
  • 540 - Organic compounds
  • 544 - Organic compounds
  • 548 - Organic compounds