Patents by Inventor Hyun N. Yoon

Hyun N. Yoon 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: 5746949
    Abstract: This invention provides novel liquid crystalline polymers which comprise, in the repeat units of their main chains, residues of suitable dichroic dyes. The polymers yield polarizer films with superior polarizing efficiency, transmittance, dichroic ratio, and thermal and humidity stability. The invention further discloses suitable processes to prepare such polymers and polarizer films therefrom.
    Type: Grant
    Filed: November 21, 1995
    Date of Patent: May 5, 1998
    Assignee: Hoechst Celanese Corp.
    Inventors: Sunny S. Shen, David W. Polis, Hyun N. Yoon, Tze-Pei Tien
  • Patent number: 5170461
    Abstract: This invention provides superior electrooptic devices containing an organic polymeric waveguiding medium, and a process of fabricating such devices. The fabrication process utilizes a substantially stress-free organic polymeric substrate on top of which the necessary organic layers are successively deposited. The substrate is so selected that its thermal expansion coefficient is substantially close to that of the cladding layers and of the waveguiding layer.
    Type: Grant
    Filed: December 11, 1991
    Date of Patent: December 8, 1992
    Assignee: Hoechst Celanese Corp.
    Inventors: Hyun N. Yoon, Frank J. Onorato, John P. Riggs
  • Patent number: 5133037
    Abstract: A waveguiding media of polymeric materials is disclosed and claimed. In a preferred embodiment both core and cladding include X.sup.(2) materials poled to a non-centrosymmetric structure. Materials are selected so that the index difference between core and cladding remains relatively constant before and after poling so as to allow for efficient fabrication.
    Type: Grant
    Filed: June 7, 1991
    Date of Patent: July 21, 1992
    Assignee: Hoechst Celanese Corp
    Inventors: Hyun N. Yoon, Chia C. Teng
  • Patent number: 5093883
    Abstract: This invention provides process embodiments for the production of second order nonlinear optical media and waveguiding devices. An important aspect of an invention waveguiding device is the use of a novel electrode design which permits the application of a high voltage electric field for molecular orientation of a dipolar organic waveguiding medium.
    Type: Grant
    Filed: April 26, 1991
    Date of Patent: March 3, 1992
    Assignee: Hoechst Celanese Corp.
    Inventors: Hyun N. Yoon, Hong-Tai Man
  • Patent number: 4910057
    Abstract: The present invention provides a highly elongated member of substantially uniform cross-sectional configuration which is capable of improved service as a stiffening support in an optical fiber cable. Such elongated member is the product of melt extrusion through an appropriate orifice of a thermotropic liquid crystalline polymer (as described). The resulting elongated member has been found to offer significant advantages when compared to stiffening supports heretofore proposed for use in optical fiber cables.
    Type: Grant
    Filed: April 2, 1982
    Date of Patent: March 20, 1990
    Assignee: Hoechst Celanese Corporation
    Inventors: Yoshiaki Ide, Gabor Kiss, Hyun N. Yoon
  • Patent number: 4882402
    Abstract: This invention provides a process for producing a transparent optical medium consisting of a liquid crystalline polymer which exhibits third order nonlinear optical response.Illustrative of an invention optical medium is a transparent film of a side chain liquid crystalline polymer corresponding to the formula: ##STR1## The transparent film has an isotropic molecular configuration with macroscopic centrosymmetry, and exhibits essentially no scattering of a transmitted incident light beam.
    Type: Grant
    Filed: October 15, 1987
    Date of Patent: November 21, 1989
    Assignee: Hoechst Celanese Corporation
    Inventors: Thomas M. Leslie, Hyun N. Yoon, Ronald N. DeMartino, James B. Stamatoff
  • Patent number: 4822865
    Abstract: This invention provides novel isotropic acrylic copolymers which exhibit nonlinear optical response, and which have utility as a transparent optical component in optical light switch and light modulator devices.
    Type: Grant
    Filed: November 10, 1987
    Date of Patent: April 18, 1989
    Assignee: Hoechst Celanese Corp.
    Inventors: Ronald N. De Martino, Hyun N. Yoon
  • Patent number: 4772089
    Abstract: A fiber-optic cable has reinforcement in the form of an elongated member such as a hollow tube, a member of solid circular cross-section, a channel member and/or an outer jacket formed of a thermotropic liquid crystalline polymer. That polymer has a coefficient of linear thermal expansion in the range of from -10.times.10.sup.-6 /.degree.F. to -4.times.10.sup.-6 /.degree.F. The reinforcing members constitute strength members which are preferably formed separate from, or simultaneously with, the introduction of an optical fiber.
    Type: Grant
    Filed: May 28, 1985
    Date of Patent: September 20, 1988
    Assignee: Polyplastics Co., Ltd.
    Inventors: Yoshiaki Ide, Gabor Kiss, Hyun N. Yoon