Patents by Inventor Hsin H. Hsieh

Hsin H. Hsieh 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 preparation of 2-oxazolidinones
    Patent number: 4500717
    Abstract: The invention is a process for the preparation of 2-oxazolidinones which comprises contacting a 2-hydroxyalkyl carbamate with an alkylene oxide or alkylene carbonate in the presence of a catalytic amount of a quaternary ammonium halide, quaternary phosphonium halide, a group I metal carbonate, hydroxide, oxide or halide, or a group II metal carbonate, hydroxide, oxide or halide under conditions such that a 2-oxazolidinone is prepared.
    Type: Grant
    Filed: March 28, 1983
    Date of Patent: February 19, 1985
    Assignee: The Dow Chemical Company
    Inventors: Frank T. Cook, Michael O. Nutt, Hsin H. Hsieh
  • Preparation of 2-aminoalkanesulfonic acid
    Patent number: 4444694
    Abstract: The invention is a process for the preparation of the metal salt of 2-aminoalkanesulfonic acid which comprises contacting a 2-oxazolidinone with a water-soluble metal sulfite or a water-soluble metal hydrogen sulfite in aqueous solution under conditions such that a metal salt of 2-aminoethanesulfonic acid is prepared.
    Type: Grant
    Filed: April 22, 1983
    Date of Patent: April 24, 1984
    Assignee: The Dow Chemical Company
    Inventor: Hsin H. Hsieh
  • Catalytic oxidation of phenols to 1,4-benzoquinones
    Patent number: 4317745
    Abstract: A catalyst for the oxidation of phenols to 1,4-benzoquinones in the gas phase with an oxygen containing gas such as air, substantially pure oxygen, or mixtures thereof. The composition of the catalyst comprises vanadium pentoxide or ammonium metavanadate, the sulfate salt of an alkali metal or of ammonia, the pyrosulfate salt of an alkali metal or of ammonia, an iron sulfate, boric acid, and silica.
    Type: Grant
    Filed: December 15, 1980
    Date of Patent: March 2, 1982
    Assignee: The Dow Chemical Company
    Inventor: Hsin H. Hsieh