Patents by Inventor Steve L. C. Hsu

Steve L. C. Hsu 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 making polyimide-polyamic ester copolymers
    Patent number: 5834581
    Abstract: A process for making polyimide-polyamic ester copolymer composition comprisingreacting at least one diamine, a pyromellitic diacid diester compound; at least one other tetracarboxylic diacid diester compound and a selected phosphoramide in the presence of a base catalyst to form a polyimide-polyamic acid ester copolymer.
    Type: Grant
    Filed: April 15, 1997
    Date of Patent: November 10, 1998
    Assignee: Olin Microelectronic Chemicals, Inc.
    Inventors: Ahmad Naiini, Steve L. C. Hsu, William D. Weber, Andrew J. Blakeney
  • Chemical imidization reagent for polyimide synthesis
    Patent number: 5789524
    Abstract: A process for producing a polyimide composition by reacting at least one polyamic acid or at least one polyamic ester or a mixture of at least one polyamic acid and at least one polyamic ester with a selected phosphoramide in the presence of at least one base catalyst to from a polyimide composition.
    Type: Grant
    Filed: April 15, 1997
    Date of Patent: August 4, 1998
    Assignee: Olin Microelectronic Chemicals, Inc.
    Inventors: Steve L. C. Hsu, Ahmad Naiini, William D. Weber, Andrew J. Blakeney
  • Process for making polyimides from diamines and tetracarboxylic diacid diester
    Patent number: 5789525
    Abstract: A process for making polyimide composition comprising reacting at least one diamine, at least one tetracarboxylic diacid diester, selected phosphoramide and at least one base catalyst to form at least one polyimide compound, said reaction carried out at a temperature from about 20.degree. C. to about 60.degree. C. and wherein the molar ratio of diamine:tetracarboxylic diacid diester:phosphoramide:base catalyst is in the range of 0.8-1.2:1:2.5-4.0:2.5-4.0.
    Type: Grant
    Filed: April 15, 1997
    Date of Patent: August 4, 1998
    Assignee: Olin Microelectronic Chemicals, Inc.
    Inventors: Ahmad Naiini, Steve L. C. Hsu, William D. Weber, Andrew J. Blakeney