Patents by Inventor Paul A. Merchak

Paul A. Merchak has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Energy curable flexographic inks incorporating grafted pigments
    Patent number: 6284816
    Abstract: Solvent-free, energy curable flexographic printing inks which contain a pigment; a rheological additive having the structure P-(U-Y)s, wherein P is the residue of an organic pigment or dye, Y is a polyalkylene oxide moiety, U is a linking moiety covalently bonding Y to P and s is an integer from 1 to 3; and an energy curable liquid vehicle which may be a ultraviolet cationic or a free radical initiated polymerization system, cured by actinic radiation; and optionally containing a photoinitiating system.
    Type: Grant
    Filed: November 23, 1998
    Date of Patent: September 4, 2001
    Assignee: Sun Chemical Corporation
    Inventors: Mikhail Laksin, Subhankar Chatterjee, Russell J. Schwartz, Paul A. Merchak
  • Fluorescent orange azo pigments
    Patent number: 5904878
    Abstract: Orange azo fluorescent pigments and a process for a preparing same. Orange azo fluorescent pigments as a component of printing ink, coating, plastic compositions and articles of manufacture and used for controlling manufacturing operations.
    Type: Grant
    Filed: May 14, 1997
    Date of Patent: May 18, 1999
    Assignee: Sun Chemical Corporation
    Inventors: Paul A. Merchak, Russell J. Schwartz, Manuel Z. Gregorio
  • Fluorescent yellow azo pigments
    Patent number: 5863459
    Abstract: Yellow azo fluorescent pigments and a process for a preparing same. Yellow azo fluorescent pigments as a component of printing ink, coating, plastic compositions and articles of manufacture and used for controlling manufacturing operations.
    Type: Grant
    Filed: May 9, 1997
    Date of Patent: January 26, 1999
    Assignee: Sun Chemical Corporation
    Inventors: Paul A. Merchak, Russell J. Schwartz, Manuel Z. Gregorio, Anthony C. Zwirgzdas