Patents by Inventor John V. Swearengin

John V. Swearengin 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 purifying arylphenones
    Patent number: 5777171
    Abstract: Hydroxy and alkyloxy benzophenones, also known as arylphenones, are efficiently and economically purified by contacting them with inorganic phosphorous compounds in the presence of a non-polar solvent. Best results are obtained when the arylphenone is then treated with an activated carbon and/or activated clay.
    Type: Grant
    Filed: October 17, 1997
    Date of Patent: July 7, 1998
    Inventor: John V. Swearengin
  • Liquid ultraviolet stabilizer and method
    Patent number: 5601756
    Abstract: Liquid UV stabilizers which are stable at room temperatures or below made from di-substituted and tri-substituted benzophenone compositions. A process to render di-substituted and tri-substituted benzophenone admixtures stable liquids at room temperatures or below involving heating the admixture to a temperature in the range of 80.degree.-175.degree. C. for a period of time sufficient that when the admixture is cooled to room temperature the admixture remains liquid.
    Type: Grant
    Filed: August 23, 1995
    Date of Patent: February 11, 1997
    Inventor: John V. Swearengin