Patents by Inventor Ivan N. Dozov

Ivan N. Dozov 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).

  • Patent number: 7335405
    Abstract: A method of using a liquid crystal composition in a bistable liquid crystal device having a weak zenithal anchoring comprising at least 40% by weight of compounds with strong molecular polarisability and strong dipole moment.
    Type: Grant
    Filed: April 3, 2006
    Date of Patent: February 26, 2008
    Assignee: NEMOPTIC
    Inventors: Jean-Claude Dubois, Didier Gallaire, Stephane Joly, Ivan N. Dozov, Philippe Martinot-Lagarde, Daniel N. Stoenescu
  • Patent number: 7115307
    Abstract: Nematic liquid crystal mixtures with weak zenithal anchoring energy for bistable display devices, comprising at least 40% by weight of compounds with strong molecular polarisability and strong dipole moment.
    Type: Grant
    Filed: February 25, 2004
    Date of Patent: October 3, 2006
    Assignee: Nemoptic
    Inventors: Jean Claude Dubois, Didier Gallaire, Stéphane Joly, Ivan N Dozov, Philippe Martinot-Lagarde, Daniel N Stoenescu
  • Patent number: 7087270
    Abstract: A method of making nematic liquid crystal devices where low energy zenith anchoring of the liquid crystal is obtained over confinement plates. A polymer or copolymer is deposited based on PVC onto a substrate. The polymer deposit is stabilized. An azimuth orientation is defined for the deposit to induce controlled azimuth anchoring of the liquid crystal.
    Type: Grant
    Filed: December 11, 2001
    Date of Patent: August 8, 2006
    Assignee: Nemoptic
    Inventors: Sandrine Lamarque-Forget, Julien Roux, Ivan N. Dozov, Philippe R. Martinot-Lagarde
  • Patent number: 7088413
    Abstract: The invention relates to a bistable nematic liquid-crystal device comprising: alignment means, which orient the liquid crystal, means designed to apply electrical signals which allow switching, by breaking the anchoring on at least one of the two substrates, between two distinct textures, and means designed to promote the establishment of that one of the said textures giving the off state in the liquid crystal covering the inter-electrode spaces.
    Type: Grant
    Filed: August 28, 2002
    Date of Patent: August 8, 2006
    Assignee: Nemoptic
    Inventors: Philippe Martinot-Lagarde, Alain Boissier, Jacques Angele, Bertrand Pecout, Ivan N. Dozov
  • Patent number: 6831716
    Abstract: The present invention relates to a reflective liquid crystal display device comprising a liquid crystal material (30) contained between two parallel substrates (20, 40) provided with aligning means on the electrodes to orient the liquid crystal and enable at least two alternative distinct textures that are stable or metastable in the absence of a field to be obtained, means for applying electrical signals to the liquid crystal to perform switching by enabling anchoring on at least one of the two substrates to be broken, a polarizer (10) associated with the front face of the device and oriented at an angle lying in the range 15° to 75° relative to the director of the liquid crystal on the front face of the device, and a specular or diffusing reflective element (50) placed at the rear face of the liquid crystal.
    Type: Grant
    Filed: November 12, 2002
    Date of Patent: December 14, 2004
    Assignee: NEMOPTIC
    Inventors: Ivan N. Dozov, Philippe R. Martinot-Lagarde, Daniel N. Stoenescu
  • Publication number: 20040201817
    Abstract: The invention relates to a bistable nematic liquid-crystal device comprising: alignment means, which orient the liquid crystal, means designed to apply electrical signals which allow switching, by breaking the anchoring on at least one of the two substrates, between two distinct textures, and means designed to promote the establishment of that one of the said textures giving the off state in the liquid crystal covering the inter-electrode spaces.
    Type: Application
    Filed: February 26, 2004
    Publication date: October 14, 2004
    Inventors: Philippe Martinot-Lagarde, Alain Boissier, Jacques Angele, Bertrand Pecout, Ivan N Dozov
  • Publication number: 20040188654
    Abstract: Nematic liquid crystal mixtures with weak zenithal anchoring energy for bistable display devices, comprising at least 40% by weight of compounds with strong molecular polarisability and strong dipole moment.
    Type: Application
    Filed: February 25, 2004
    Publication date: September 30, 2004
    Inventors: Jean Claude Dubois, Didier Gallaire, Stephane Joly, Ivan N. Dozov, Philippe Martinot-Lagarde, Daniel N. Stoenescu
  • Patent number: 6795146
    Abstract: The invention concerns a bistable device comprising a liquid crystal material, aligning means, which orient the liquid crystal to provide two stable or metastable textures, means for applying electric signals enabling to switch between the two textures, a polarizer (10) associated with the front surface of the device, placed inside or outside same, a reflective, specular or diffusing element, placed on the rear surface of the liquid crystal, inside or outside the device, allowing light to pass through the device twice and to return towards the observer or towards additional optical elements, and a compensator (20), placed between the polarizer and the reflective element, with an optical retardation dc&Dgr;nc close to &lgr;0/4.
    Type: Grant
    Filed: November 8, 2002
    Date of Patent: September 21, 2004
    Assignee: NEMOPTIC
    Inventors: Ivan N. Dozov, Philippe R. Martinot-Lagarde, Daniel N. Stoenescu
  • Publication number: 20030174266
    Abstract: The present invention relates to a reflective liquid crystal display device comprising a liquid crystal material (30) contained between two parallel substrates (20, 40) provided with aligning means on the electrodes to orient the liquid crystal and enable at least two alternative distinct textures that are stable or metastable in the absence of a field to be obtained, means for applying electrical signals to the liquid crystal to perform switching by enabling anchoring on at least one of the two substrates to be broken, a polarizer (10) associated with the front face of the device and oriented at an angle lying in the range 15° to 75° relative to the director of the liquid crystal on the front face of the device, and a specular or diffusing reflective element (50) placed at the rear face of the liquid crystal.
    Type: Application
    Filed: November 12, 2002
    Publication date: September 18, 2003
    Inventors: Ivan N Dozov, Philippe R Martinot-Lagarde, Daniel N Stoenescu
  • Publication number: 20030128314
    Abstract: The invention concerns a bistable device comprising a liquid crystal material, aligning means, which orient the liquid crystal to provide two stable or metastable textures, means for applying electric signals enabling to switch between the two textures, a polarizer (10) associated with the front surface of the device, placed inside or outside same, a reflective, specular or diffusing element, placed on the rear surface of the liquid crystal, inside or outside the device, allowing light to pass through the device twice and to return towards the observer or towards additional optical elements, and a compensator (20), placed between the polarizer and the reflective element, with an optical retardation dc&Dgr;nc close to &lgr;0/4.
    Type: Application
    Filed: November 8, 2002
    Publication date: July 10, 2003
    Inventors: Ivan N. Dozov, Philippe R. Martinot-Lagarde, Daniel N. Stoenescu
  • Publication number: 20030112396
    Abstract: The present invention relates to a method of making nematic liquid crystal devices, characterized by the fact that low energy zenith anchoring of the liquid crystal is obtained over at least one of the confinement plates by the steps consisting in:
    Type: Application
    Filed: November 18, 2002
    Publication date: June 19, 2003
    Inventors: Sandrine Lamarque-Forget, Julien Roux, Ivan N. Dozov, Philippe R. Martinot-Lagarde