Patents by Inventor Allan K. S. Tsai

Allan K. S. Tsai 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).

  • Method of making certain 2,3-dihydro-1,4-dithiins
    Patent number: 4319033
    Abstract: A method of making certain 2,3-dihydro-1,4-dithiins of the following formula by the action of alpha-hydroxyketones (acyloins) of 1,2-dithiols: ##STR1## wherein R.sup.1 and R.sup.2 are hydrogen or alkyl having 1 to 6 carbon atoms or are joined together to form a ring with 3 or 4 methylene groups, and R.sup.3 and R.sup.4 are hydrogen or the same or different alkyl groups having 1 to 10 carbon atoms, which alkyl groups may be substituted with lower alkoxy groups.
    Type: Grant
    Filed: March 26, 1981
    Date of Patent: March 9, 1982
    Assignee: Uniroyal Ltd.
    Inventors: Allan K. S. Tsai, Duncan D. Lennox, Arthur D. Brewer