1872756

Information

• Patent Grant
• 1872756

• References
• Source

• Patent Number

  1,872,756

• Date Filed

  Not available

• Date Issued

  Tuesday, August 23, 1932
  92 years ago

• CPC

  • C07C50/22 - the quinoid structure being part of a condensed ring system containing four or more rings

• US Classifications

  • 552 - Organic compounds