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Rigidized trimethine cyanine dyes

  • US 6,133,445 A
  • Filed: 12/16/1998
  • Issued: 10/17/2000
  • Est. Priority Date: 12/17/1997
  • Status: Expired due to Term
First Claim
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1. A compound of the formula 6,7,9,10-Tetrahydro-2-carboxymethyl-14-sulphonato-16,16,18,18-tetramethyl-7aH,8aH-bisindolinium[3,2-a,3'"'"'2'"'"'-a]pyrano[3,2-c;

  • 5,6-c'"'"']dipyridin-5-ium and its esters.

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