1863987

Information

• Patent Grant
• 1863987

• References
• Source

• Patent Number

  1,863,987

• Date Filed

  Not available

• Date Issued

  Tuesday, June 21, 1932
  92 years ago

• CPC

  • C09B3/44 - Preparation from starting materials already containing the pyranthrone nucleus

• US Classifications

  • 552 - Organic compounds