1909638

Information

• Patent Grant
• 1909638

• References
• Source

• Patent Number

  1,909,638

• Date Filed

  Not available

• Date Issued

  Tuesday, May 16, 1933
  91 years ago

• CPC

  • C07C50/36 - the quinoid structure being part of a condensed ring system having four or more rings
  • C07C50/34 - the quinoid structure being part of a condensed ring system having three rings
  • C09B1/08 - Dyes containing only OH-groups

• US Classifications

  • 552 - Organic compounds