2140539

Information

• Patent Grant
• 2140539

• References
• Source

• Patent Number

  2,140,539

• Date Filed

  Not available

• Date Issued

  Tuesday, December 20, 1938
  86 years ago

• CPC

  • C09B29/3617 - containing a six-membered heterocyclic with only one nitrogen as heteroatom

• US Classifications

  • 008 - Bleaching and dyeing
  • 534 - Organic compounds