Patents by Inventor Peter K. Sysak

Peter K. Sysak 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).

  • Powdered packaged developer
    Patent number: 4816384
    Abstract: A storage stable and rapid dissolving packaged powder developer of uniform composition is produced by preparing developer or developer precursor solutions and removing solvent to provide powder for packaging in plastic impervious to the atmosphere. Preferably, the solvent is removed by freeze-drying or spray-drying.
    Type: Grant
    Filed: October 9, 1986
    Date of Patent: March 28, 1989
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Daniel R. Fruge, Peter K. Sysak
  • Ionic copolymers in photographic light-sensitive silver halide films
    Patent number: 4391903
    Abstract: Ionic copolymers of styrene sulfonic acid and maleic acid improve covering power when added to the gelatin binder employed in medical silver halide X-ray emulsions.
    Type: Grant
    Filed: February 8, 1982
    Date of Patent: July 5, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventor: Peter K. Sysak
  • Photoimaging compositions containing substituted cyclohexadienone compounds
    Patent number: 4341860
    Abstract: Photoimaging compositions comprising (A) a cyclohexadienone compound as defined, and at least one of (B.sub.1) a leuco dye or (B.sub.2) addition polymerizable ethylenically unsaturated monomer. A polymer binder can be present in the compositions. The new imaging compositions are useful in photoimaging products such as proofing papers, printout papers, overlay films and photopolymerizable elements useful for printing and photoresist purposes. The compositions have improved thermal stability.
    Type: Grant
    Filed: June 8, 1981
    Date of Patent: July 27, 1982
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Peter K. Sysak
  • Bis(substituted amino)sulfides as reversible inhibitor sources for photopolymerization
    Patent number: 4168981
    Abstract: Photopolymerizable coating compositions which contain an ethylenically unsaturated polymerizable compound and a radiation sensitive, free-radical generating system are thermally stabilized to inhibit polymerization at elevated temperature without affecting room temperature photopolymerization by adding to the composition a bis(substituted amino)monosulfide or bis(substituted amino)polysulfide.
    Type: Grant
    Filed: April 14, 1977
    Date of Patent: September 25, 1979
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Dennis S. Donald, Peter K. Sysak