Patents by Inventor You S. Kim

You S. Kim 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 preparing piperazinyl quinolone derivatives
    Patent number: 5051505
    Abstract: A novel process for preparing piperazinyl quinolone derivatives of the formula (I) is disclosed. The process comprises reacting dihaloquinolones with piperazine derivatives and tetraalkyl ammonium halides in the presence of a polar solvent such as acetonitrile, dimethylformamide, pyridine, sulfolane and dimethyl sulfoxide.
    Type: Grant
    Filed: August 2, 1990
    Date of Patent: September 24, 1991
    Assignee: Korea Institute of Science and Technology
    Inventors: Sang W. Park, You S. Kim, Jin H. Lee
  • Equilibration of lithium niobate crystals
    Patent number: 4725330
    Abstract: A process is described for producing optical integrated circuits on lithium niobate substrates in which the composition of the lithium niobate substrates is adjusted by a powder bed equilibration procedure. This procedure involved exposure of the lithium niobate crystals to a powder bed in a crucible during a heat treatment. A similar procedure is used during production of optical integrated circuits to maintain the desired Li/Nb composition in the substrate.
    Type: Grant
    Filed: May 6, 1985
    Date of Patent: February 16, 1988
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventors: Ronald J. A. Holmes, You S. Kim, Henry M. O'Bryan, Jr.