Patents by Inventor Kfir Dar

Kfir Dar 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).

  • OVER-PRINT VARNISH FORMULATION
    Publication number: 20260103612
    Abstract: An over-print varnish formulation is described. The formulation comprises a non-ionic polyurethane dispersion; a water-soluble polymer of Mw less than 55,000; a wax having a particle size (d50) 200 nm or less; and a water-soluble solvent, and at least 20 wt % solids, based on the total weight of the formulation. A method of printing using the formulation, and a printed article are also described.
    Type: Application
    Filed: October 31, 2025
    Publication date: April 16, 2026
    Inventors: Alex Trubnikov, Mazi Bar, Eytan Cohen, Kfir Dar, Kobi Cohen
  • Over-print varnish formulation
    Patent number: 12460096
    Abstract: An over-print varnish formulation is described. The formulation comprises a non-ionic polyurethane dispersion; a water-soluble polymer of Mw less than 55,000; a wax having a particle size (d50) 200 nm or less; and a water-soluble solvent, and at least 20 wt % solids, based on the total weight of the formulation. A method of printing using the formulation, and a printed article are also described.
    Type: Grant
    Filed: April 2, 2020
    Date of Patent: November 4, 2025
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Alex Trubnikov, Mazi Bar, Eytan Cohen, Kfir Dar, Kobi Cohen
  • OVER-PRINT VARNISH FORMULATION
    Publication number: 20230104817
    Abstract: An over-print varnish formulation is described. The formulation comprises a non-ionic polyurethane dispersion; a water-soluble polymer of Mw less than 55,000; a wax having a particle size (d50) 200 nm or less; and a water-soluble solvent, and at least 20 wt % solids, based on the total weight of the formulation. A method of printing using the formulation, and a printed article are also described.
    Type: Application
    Filed: April 2, 2020
    Publication date: April 6, 2023
    Inventors: Alex Trubnikov, Mazi Bar, Eytan Cohen, Kfir Dar, Kobi Cohen
  • METHOD OF PRINTING
    Publication number: 20230095396
    Abstract: A method of printing is described. The method comprises applying a fixer composition onto a substrate. The fixer composition comprises a polyvalent metal salt, a cationic polymer, and a liquid vehicle, with a ratio of polyvalent metal salt to cationic polymer in a range of 1:1 to 3.5:1. The method comprises applying an ink composition onto the fixer composition; and applying an over-print varnish composition onto the ink composition. A printed article and a print set are also described.
    Type: Application
    Filed: April 2, 2020
    Publication date: March 30, 2023
    Inventors: Mazi Bar, Alex Trubnikov, Eytan Cohen, Kfir Dar, Kobi Cohen
  • Piezo-jettable varnish composition
    Patent number: 10947399
    Abstract: Herein is described a piezo-jettable varnish composition comprising a latex polymer having a weight averaged molecular weight Mw of greater than about 50 000, a polymeric salt derived from an acidic polymer having a weight averaged molecular weight Mw in the range of about 1000 to about 50 000, water, and a co-solvent, wherein, the latex polymer and polymeric salt are present in amounts such that the ratio of latex polymer to polymeric salt by weight is in the range of greater than about 1:1 to about 8:1.
    Type: Grant
    Filed: April 21, 2017
    Date of Patent: March 16, 2021
    Assignee: HP Scitex LTD.
    Inventors: Eytan Cohen, Alex Trubnikov, Shimrit Rubin, Efrat Soroker, Kfir Dar, Kobi Cohen
  • PIEZO-JETTABLE VARNISH COMPOSITION
    Publication number: 20200024466
    Abstract: Herein is described a piezo-jettable varnish composition comprising a latex polymer having a weight averaged molecular weight Mw of greater than about 50 000, a polymeric salt derived from an acidic polymer having a weight averaged molecular weight Mw in the range of about 1000 to about 50 000, water, and a co-solvent, wherein, the latex polymer and polymeric salt are present in amounts such that the ratio of latex polymer to polymeric salt by weight is in the range of greater than about 1:1 to about 8:1.
    Type: Application
    Filed: April 21, 2017
    Publication date: January 23, 2020
    Inventors: Eytan Cohen, Alex Trubnikov, Shimrit Rubin, Efrat Soroker, Kfir Dar, Kobi Cohen