Patents by Inventor David L. Griffus

David L. Griffus 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).

  • Color sample holder to enhance repeatability of instrumental color readings
    Patent number: 6804006
    Abstract: An apparatus for holding a generally flat color sample in a plurality of fixed and repeatable positions in proximity with the optics of a portable color instrument with a uniform and repeatable force. The apparatus has a platform upon which the portable color instrument is secured, a sample stage with multiple index planes upon which a color sample is placed, and a device which urges a pressure foot against the color sample, thereby holding the color sample in position on the stage with a uniform and repeatable force.
    Type: Grant
    Filed: July 2, 2002
    Date of Patent: October 12, 2004
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: David L. Griffus, Allan B. Rodrigues
  • Color sample holder to enhance repeatability of instrumental color readings
    Publication number: 20040004718
    Abstract: An apparatus for holding a generally flat color sample in a plurality of fixed and repeatable positions in proximity with the optics of a portable color instrument with a uniform and repeatable force. The apparatus has a platform upon which the portable color instrument is secured, a sample stage with multiple index planes upon which a color sample is placed, and a device which urges a pressure foot against the color sample, thereby holding the color sample in position on the stage with a uniform and repeatable force.
    Type: Application
    Filed: July 2, 2002
    Publication date: January 8, 2004
    Inventors: David L. Griffus, Allan B. Rodrigues