Patents by Inventor Jung-Hsien Tsao

Jung-Hsien Tsao 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).

  • Polymer composition having terminal alkene and terminal carboxyl groups
    Patent number: 4481281
    Abstract: A polymer composition comprising a urethane having terminal unsaturation and a terminal carboxyl group and which is capable of further free radical polymerization has been synthesized. This polymer can be a liquid or a solid depending on the molecular weight and backbone of the polymer. This polymer as a liquid has been found to be very useful in producing printed circuit boards by photo resist processes.
    Type: Grant
    Filed: September 29, 1982
    Date of Patent: November 6, 1984
    Assignee: W. R. Grace & Co.
    Inventors: Jung-Hsien Tsao, Paul R. Hein
  • Polymer composition having terminal alkene and terminal carboxyl groups
    Patent number: 4451636
    Abstract: A polymer composition comprising a urethane having terminal unsaturation and a terminal carboxyl group and which is capable of further free radical polymerization has been synthesized. This polymer can be a liquid or a solid depending on the molecular weight and backbone of the polymer. This polymer as a liquid has been found to be very useful in producing printed circuit boards by photo resist processes.
    Type: Grant
    Filed: September 29, 1982
    Date of Patent: May 29, 1984
    Assignee: W. R. Grace & Co.
    Inventors: Jung-Hsien Tsao, Paul R. Hein
  • Polymer composition having terminal alkene and terminal carboxyl groups
    Patent number: 4442198
    Abstract: A polymer composition comprising a urethane having terminal unsaturation and a terminal carboxyl group and which is capable of further free radical polymerization has been synthesized. This polymer can be a liquid or a solid depending on the molecular weight and backbone of the polymer. This polymer as a liquid has been found to be very useful in producing printed circuit boards by photo resist processes.
    Type: Grant
    Filed: September 29, 1982
    Date of Patent: April 10, 1984
    Assignee: W. R. Grace & Co.
    Inventors: Jung-Hsien Tsao, Paul R. Hein
  • Polymer composition having terminal alkene and terminal carboxyl groups
    Patent number: 4422914
    Abstract: A polymer composition comprising a urethane having terminal unsaturation and a terminal carboxyl group and which is capable of further free radical polymerization has been synthesized. This polymer can be a liquid or a solid depending on the molecular weight and backbone of the polymer. This polymer as a liquid has been found to be very useful in producing printed circuit boards by photo resist processes.
    Type: Grant
    Filed: January 16, 1981
    Date of Patent: December 27, 1983
    Assignee: W. R. Grace & Co.
    Inventors: Jung-Hsien Tsao, Paul R. Hein
  • Process for preparing catalytic solutions of sulfonium salts
    Patent number: 4179400
    Abstract: This invention relates to a process for preparing a catalytic solution of a sulfonium salt of a complex anion, capable of yielding a Lewis Acid when irradiated by UV or high energy ionizing radiation comprising reacting a sulfonium halide with an alkali metal salt of the complex anion in a solvent mixture containing a polyol having at least two hydroxy groups and a lactone.
    Type: Grant
    Filed: January 25, 1979
    Date of Patent: December 18, 1979
    Assignee: W. R. Grace & Co.
    Inventors: Jung-Hsien Tsao, Arthur D. Ketley
  • Photocurable epoxy-acrylate compositions
    Patent number: 4156035
    Abstract: This invention relates to radiation curable compositions comprising mixtures of epoxy resin and di- or polyacrylate or methacrylate terminated monomers in combination with a catalyst system comprising a carbonyl type photoinitiator with an aromatic onium salt capable of effecting the cure by release of a Lewis Acid.
    Type: Grant
    Filed: May 9, 1978
    Date of Patent: May 22, 1979
    Assignee: W. R. Grace & Co.
    Inventors: Jung-Hsien Tsao, Arthur D. Ketley
  • Process for preparing catalytic solutions of sulfonium salts
    Patent number: 4154872
    Abstract: This invention relates to a process for preparing a catalytic solution of a sulfonium salt of a complex anion, capable of yielding a Lewis Acid when irradiated by UV or high energy ionizing radiation comprising reacting a sulfonium halide with an alkali metal salt of the complex anion in a solvent mixture containing a polyol having at least two hydroxy groups and a lactone.
    Type: Grant
    Filed: May 9, 1978
    Date of Patent: May 15, 1979
    Assignee: W. R. Grace & Co.
    Inventors: Jung-Hsien Tsao, Arthur D. Ketley