Patents by Inventor Robert F. Sanford

Robert F. Sanford 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).

  • Multilevel bar code reader
    Patent number: 4443694
    Abstract: A bar code reader is sensitive to at least three levels of darkness. At least three levels of darkness are utilized in the bar code so that, a higher density of data is thereby achieved. In the preferred embodiment, the bar code is encoded so that a transitional change from one level of darkness to another level of darkness is indicative of the data bits encoded. The bar code reader is passed over the multilevel bar code and through the use of a linear conversion such as by an analog to digital converter, the level of darkness of the bar is communicated to a decipher so as to be translated into a binary sequence.
    Type: Grant
    Filed: November 5, 1981
    Date of Patent: April 17, 1984
    Assignee: Texas Instruments Incorporated
    Inventor: Robert F. Sanford
  • Copy paper test apparatus
    Patent number: 4139816
    Abstract: Test apparatus which indicates the peak potential to which copy paper is charged, the surface potential remaining after a dark decay interval, and the potential remaining after a light exposure interval.
    Type: Grant
    Filed: December 15, 1977
    Date of Patent: February 13, 1979
    Assignee: Princeton Electro Dynamics, Inc.
    Inventor: Robert F. Sanford