Patents Represented by Attorney Wendy Choi

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  • Ink composition and method for preparing
    Patent number: 5821283
    Abstract: An ink composition and a method for preparing the ink composition are disclosed. The ink composition provides stability, bleed resistance and lightfastness without requiring the use of a cosolvent. The composition is based on a polymeric dispersant which is compatible with the hydrophobic surfaces of many pigments and which forms a stable dispersion of pigment in an aqueous environment. The ink composition is useful for organic and inorganic pigments.
    Type: Grant
    Filed: September 30, 1996
    Date of Patent: October 13, 1998
    Assignee: Rohm and Haas Company
    Inventors: Carl Michael Hesler, Ethan Scott Simon
  • Method of treating leather with improved retaining agents
    Patent number: 5820633
    Abstract: The present invention is directed to a method of treating tanned leather to improve its dyeing characteristics while still retaining desired grain break and grain strength. The tanned leather is contacted, preferably by immersion, in a float containing a syntan and a desired colorant. The syntan includes a copolymer of a carboxylic acid monomer and a vinyl ester monomer, such as, vinyl acetate. The retanning method of the present invention provides wide process latitude.
    Type: Grant
    Filed: July 16, 1997
    Date of Patent: October 13, 1998
    Inventors: Patricia Marie Lesko, James John Hodder, Alvin Michael Maurice