2219009

Information

• Patent Grant
• 2219009

• References
• Source

• Patent Number

  2,219,009

• Date Filed

  Not available

• Date Issued

  Tuesday, October 22, 1940
  84 years ago

• CPC

  • C09B11/08 - Phthaleins; Phenolphthaleins; Fluorescein
  • C09B11/24 - Phthaleins containing amino groups; Phthalanes; Fluoranes; Phthalides; Rhodamine dyes; Phthaleins having heterocyclic aryl rings; Lactone or lactame forms of triarylmethane dyes
  • C09B11/245 - Phthaleins having both OH and amino substituent(s) on aryl ring

• US Classifications

  • 549 - Organic compounds
  • 250 - Radiant energy
  • 544 - Organic compounds