Patents by Inventor William F. Christie

William F. Christie 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).

  • Coded polymeric material and method
    Patent number: 4431766
    Abstract: Polymeric materials, for example, vinyl materials contain an added trace amount of a compound which is detectable by an instrumental method of analysis in the absence of the step of freshly exposing a surface of the sample and without substantial interference from other ingredients in the vinyl material. The incorporation of the added trace compound allows for coding of the material and provides a means to later identify the manufacturer of the film without the need to affix more visible identification means thereto.
    Type: Grant
    Filed: November 5, 1979
    Date of Patent: February 14, 1984
    Assignee: Stauffer Chemical Company
    Inventors: William F. Christie, Lawrence A. Smalheiser