Patents by Inventor Roger A. Mader

Roger A. Mader 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).

  • 2,4-Dihydroxy-4-pentadecyl benzophenone and compositions containing the same
    Patent number: 4024106
    Abstract: 2,4'-Dihydroxy-4-pentadecyl benzophenone is prepared by mixing in the presence of an acid catalyst equimolar amounts of meta pentadecyl phenol and parahydroxy benzoic acid. Thermoplastic resins, normally susceptible to degradation upon prolonged exposure to ultraviolet light, become resistant to such degradation when a small amount of 2,4'-dihydroxy-4-pentadecyl benzophenone is blended therein.
    Type: Grant
    Filed: November 17, 1975
    Date of Patent: May 17, 1977
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Roger A. Mader