Patents by Inventor Anthony J. Calvert

Anthony J. Calvert 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).

  • Polymerization process
    Patent number: 4304888
    Abstract: This application is concerned with improved processes for the preparation of polyvinyl imidazolines and polyvinyl tetrahydropyrimidines by reacting polyacrylonitriles with alkylene diamines in the presence of carbon dioxide.
    Type: Grant
    Filed: April 7, 1980
    Date of Patent: December 8, 1981
    Assignee: The Gillette Company
    Inventors: Anthony J. Calvert, Eric C. Collingwood