Patents by Inventor Byung Yang An

Byung Yang An 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).

  • Voice coding method at a code division multiple access base station
    Patent number: 6128289
    Abstract: The present invention is to increase the efficiency of the transmission channel between the base stations and to improve the accuracy of the signal in transmitting the traffic information in the circuit communication method or TDM method in comparison with the packet method, and provides the method for speech coding at the Code Division Multiple Access base station which can solve the anticipated problem of the frame sync acquisition between base stations in such case.
    Type: Grant
    Filed: December 9, 1997
    Date of Patent: October 3, 2000
    Assignees: Electronics and Telecommunications Research Institute, Dacom Corporation
    Inventors: Sung Jun Baik, Byung Yang An, Kyung Jun Lee, Hun Lee
  • Method for polymerization of an .alpha.-olefin
    Patent number: 6066702
    Abstract: A method for polymerization or copolymerization of .alpha.-olefin, characterized in that the polymerization is performed using a solid complex titanium catalyst comprising magnesium, a halogen-containing titanium compound, and internal electron donors; organometallic compounds of metals belonging to Groups I and III on the periodic table of elements; and, as external electron donors, a mixture of three or more kinds of organic silicon compounds, from which homopolyolefins having MFR less than 5, MFR in the range from 5 to 20, and MFR greater than 20 are polymerized under the same polymerization conditions. By use of the present invention it is possible to produce an olefin polymer with high stereoregularity, broad molecular weight distribution, and good fluidity, at high rates of yield.
    Type: Grant
    Filed: May 7, 1998
    Date of Patent: May 23, 2000
    Assignee: Samsung General Chemicals Co., Ltd.
    Inventors: Ki-Su Ro, Il-Seop Kim, Chun-Byung Yang, Youn-Seok Park
  • Catalyst for polymerization and copolymerization of olefins
    Patent number: 6034025
    Abstract: A method for producing a catalyst for the polymerization or copolymerization of olefins is described. The method includes producing a magnesium compound solution by reacting a magnesium halide compound in the mixture of a cyclic ether and two alcohols with an organosilane compound. The magnesium compound solution may be reacted with a titanium halide compound such that precipitated solid components are formed. These precipitated solid components may be reacted with a titanium compound and an electron donor to produce the polymerization catalyst.
    Type: Grant
    Filed: December 11, 1997
    Date of Patent: March 7, 2000
    Assignee: Samsung General Chemicals, Co., Ltd.
    Inventors: Chun-Byung Yang, Mie-Ock Kim
  • Voice coding apparatus at a code division multiple access base station
    Patent number: 5991288
    Abstract: The present invention is to increase the efficiency of the transmission channel between the base stations and to improve the accuracy of the signal in transmitting the traffic information in the circuit communication method or TDM method in comparison with the packet method, and provides the apparatus for speech coding at the Code Division Multiple Access base station which can solve the anticipated problem of the frame sync acquisition between base stations in such case.
    Type: Grant
    Filed: November 13, 1997
    Date of Patent: November 23, 1999
    Assignees: Electronics and Telecommunication Research Institute, Dacom Corporation
    Inventors: Sung Jun Baik, Byung Yang An, Kyung Jun Lee, Hun Lee