Patents by Inventor Jiri Kresta

Jiri Kresta 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).

  • Initiators for isocyanate reactions
    Patent number: 4288562
    Abstract: The reaction of isocyanates with substances containing isocyanate groups or active hydrogen groups, such as hydroxyl groups, amino groups and the like, are initiated by sulfonium zwitterions such as the ar-cyclic sulfonium areneoxides. Accordingly, partially trimerized isocyanates, polyurethanes and other useful materials can be made.
    Type: Grant
    Filed: April 28, 1980
    Date of Patent: September 8, 1981
    Assignee: The Dow Chemical Co.
    Inventors: Jiri Kresta, Chen S. Shen
  • Process of reacting isocyanates with active hydrogen containing compounds using sulfonium zwitterions as initiators
    Patent number: 4220728
    Abstract: The reaction of isocyanates with substances containing isocyanate groups or active hydrogen groups, such as hydroxyl groups, amino groups and the like, are initiated by sulfonium zwitterions such as the ar-cyclic sulfonium areneoxides. Accordingly, partially trimerized isocyanates, polyurethanes and other useful materials can be made.
    Type: Grant
    Filed: March 27, 1978
    Date of Patent: September 2, 1980
    Assignee: The Dow Chemical Company
    Inventors: Jiri Kresta, Chen S. Shen
  • Initiators for isocyanate reactions
    Patent number: 4111914
    Abstract: The reaction of isocyanates with substances containing isocyanate groups or active hydrogen groups, such as hydroxyl groups, amino groups and the like, are initiated by sulfonium zwitterions such as the ar-cyclic sulfonium areneoxides. Accordingly, partially trimerized isocyanates, polyurethanes and other useful materials can be made.
    Type: Grant
    Filed: June 14, 1976
    Date of Patent: September 5, 1978
    Assignee: The Dow Chemical Company
    Inventors: Jiri Kresta, Chen S. Shen