1931196

Information

• Patent Grant
• 1931196

• References
• Source

• Patent Number

  1,931,196

• Date Filed

  Not available

• Date Issued

  Tuesday, October 17, 1933
  91 years ago

• CPC

  • C09B5/12 - Thiophenanthrones

• US Classifications

  • 549 - Organic compounds
  • 546 - Organic compounds
  • 548 - Organic compounds