Patents by Inventor F. Mark Laskovics

F. Mark Laskovics 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 preparing 2,6-di-tertiarybutyl-4-mercaptophenol and 4,4'-isopropylidenedithio-bis-(2,6-di-tertiarybutylphenol)
    Patent number: 5401883
    Abstract: This invention relates to an improvement in a process for making 2,6-di-tertiarybutyl-4-mercaptophenol and 4,4-isopropylidenedithio-bis-(2,6-di-tertiarybutylphenol) which comprises reduction of bis (3,5-di-tertiarybutyl-4-hydroxyphenyl)polysulfide with hydrogen gas at a temperature range of from about 20.degree. C. to about 90.degree. C. in the presence of a catalytic amount of cobalt-molybdenum catalyst.
    Type: Grant
    Filed: July 7, 1993
    Date of Patent: March 28, 1995
    Assignee: Merrell Dow Pharmaceuticals Inc.
    Inventors: F. Mark Laskovics, Kim G. Bargeron