Patents by Inventor Howard Sorkin

Howard Sorkin 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).

  • Process for coating inorganic particles with condensating polymers
    Patent number: 4594271
    Abstract: A first stable suspension of at least one solid monomer, capable of being polymerized to a condensation polymer when heated, is formed in a first organic liquid inert during polymerization and containing a minor amount of a dispersing agent stable during said polymerization. A second stable suspension of finely divided inorganic particles in a second organic liquid inert during said polymerization and miscible with said first organic liquid, is formed and contains a minor amount of a dispersing agent. The first suspension is then added to the second suspension while stirring and heating the second suspension to the polymerization temperature of the monomer.
    Type: Grant
    Filed: October 15, 1985
    Date of Patent: June 10, 1986
    Assignees: U.S. Philips Corporation, North American Philips Corporation
    Inventors: Pieter C. Scholten, Fred W. Snyder, Howard Sorkin
  • 5-Substituted-2-(4-cyanophenyl)-1,3-dioxanes
    Patent number: 4335012
    Abstract: Compounds of the formula: ##STR1## wherein R is an alkyl, alkoxy, aryl, aryloxy, arylester, carboxy or ester derived from carboxy are used as liquid crystal materials in electro-optical displays.A typical embodiment is 5-butyl-2-(4-cyanophenyl)-1,3-dioxane which has a very low threshold voltage in nematic displays. On rubbed indium oxide surfaces the threshold voltage was 0.6 V using predominately the trans isomer. It was nematic over the range 32.2.degree. C. to 34.6.degree. C.
    Type: Grant
    Filed: July 6, 1981
    Date of Patent: June 15, 1982
    Assignee: Timex Corporation
    Inventor: Howard Sorkin
  • 5-Substituted-2-(4-cyanophenyl)-1,3,-dioxanes
    Patent number: 4322354
    Abstract: Compounds of the formula: ##STR1## wherein R is an alkyl, alkoxy, aryl, aryloxy, arylester, carboxy or ester derived from carboxy are used as liquid crystal materials in electro-optical displays.A typical embodiment is 5-butyl-2-(4-cyanophenyl)-1,3-dioxane which has a very low threshold voltage in nematic displays. On rubbed indium oxide surfaces the threshold voltage was 0.6 V using predominately the trans isomer. It was nematic over the range 32.2.degree. C. to 34.6.degree. C.
    Type: Grant
    Filed: April 3, 1980
    Date of Patent: March 30, 1982
    Assignee: Timex Corporation
    Inventor: Howard Sorkin
  • Method to provide homogeneous liquid crystal cells containing a dyestuff
    Patent number: 4098301
    Abstract: Filled liquid crystal cells containing a soluble, pleochroic dyestuff are treated by heating above the nematic to isotropic liquid transition temperature until the cells appear uniformly colored.
    Type: Grant
    Filed: December 23, 1976
    Date of Patent: July 4, 1978
    Assignee: RCA Corporation
    Inventors: Allen Bloom, Howard Sorkin
  • Process for filling dynamic scattering liquid crystal cells
    Patent number: 4091847
    Abstract: A dynamic scattering liquid crystal cell is filled from a single fill port by first applying a film of a mixture of at least two resistivity dopants, each having different ions, to the cell walls, then filling the cell with a liquid crystal composition containing both dopants.
    Type: Grant
    Filed: November 22, 1976
    Date of Patent: May 30, 1978
    Assignee: RCA Corporation
    Inventor: Howard Sorkin
  • Method of filling dynamic scattering liquid crystal devices
    Patent number: 4064919
    Abstract: A dynamic scattering liquid crystal cell can be filled from a single fill port by evacuating the cell, filling with a solution of an ionic dopant in a volatile solvent, evaporating the solvent and refilling under vacuum with the dynamic scattering liquid crystal composition. Ion hang-up is avoided and only a single volume of the liquid crystal composition is required to fill the cell.
    Type: Grant
    Filed: November 22, 1976
    Date of Patent: December 27, 1977
    Assignee: RCA Corporation
    Inventors: Herman Abraham Stern, Howard Sorkin, Henry Claude Schindler
  • Liquid crystal devices
    Patent number: 4003844
    Abstract: The addition of certain nitrobenzene compounds to liquid crystal compositions having positive dielectric anisotropy, lowers the threshold voltage of electro-optic cells including such compositions. The nitrobenzene compounds have the formula ##STR1## wherein R is an alkyl group of 1-20 carbon atoms, X.sub.1 and X.sub.3 can be hydrogen or nitro and X.sub.2 can be hydrogen, --NO.sub.2, ##STR2## or--O--CH.sub.2 CN, with the proviso that at least one of X.sub.1, X.sub.2 or X.sub.3 is a radical other than hydrogen.
    Type: Grant
    Filed: November 17, 1975
    Date of Patent: January 18, 1977
    Assignee: RCA Corporation
    Inventor: Howard Sorkin