Patents by Inventor You-Jyh Lin

You-Jyh Lin 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).

  • Synthesis of non-cyclic aliphatic polyamines
    Patent number: 5105015
    Abstract: An improved process for selectively forming noncyclic, aliphatic polyamines from the corresponding aliphatic polynitriles by reacting the polynitrile with hydrogen at low temperature under a pressure of from 50 to 5,000 psi in a fixed bed reactor while continuously contacting the reactants with granular chromium and nickel promoted Raney.RTM. cobalt packed therein.
    Type: Grant
    Filed: June 4, 1991
    Date of Patent: April 14, 1992
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: You-Jyh Lin, Stephen R. Schmidt, Ramin Abhari
  • Process for the preparation of .beta.-hydroxyketones
    Patent number: 4898988
    Abstract: A process for the preparation of .beta.-hydroxyketones comprising the catalytic hydrogenolysis of an aqueous solution of isoxazolines having the formula ##STR1## in a fixed bed reactor containing a transition metal catalyst at a temperature between 20.degree. to 150.degree. C. and a pressure from about 0 to 150 psig; wherein R.sub.1 and R.sub.2 are independently selected from hydrogen, alkyl, cycloalkyl or aromatic group and wherein the aqueous solution of isoxazolines is substantially free of acids or buffers.
    Type: Grant
    Filed: March 13, 1989
    Date of Patent: February 6, 1990
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: You-Jyh Lin, Harold Kloczewski