Patents Represented by Attorney, Agent or Law Firm Pillsbury Wintthrop LLP
  • Dis-azo dyestuffs and use thereof in ink-jet printing
    Patent number: 6712893
    Abstract: A compound of Formula (1) and salts thereof: In the formula, m is 1, 2 or 3; X is H or SO3H; R1 and R2 are each independently selected from optionally substituted alkyl and optionally substituted alkoxy; and R4 and R5 are each independently H, optionally substituted alkyl or optionally substituted aryl. When (i) at least one of R1 and R2 carries an —OH group; and (ii) when X is H at least one of R1 and R2 is optionally substituted alkyl. The compounds are useful as dyes for ink jet printing inks.
    Type: Grant
    Filed: June 28, 2001
    Date of Patent: March 30, 2004
    Assignee: Avecia Limited
    Inventors: Prahalad Manibhai Mistry, Roy Bradbury