Patents by Inventor John H. Kirk, Jr.

John H. Kirk, Jr. 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 and apparatus for producing a facsimile gray scale
    Patent number: 4276569
    Abstract: A facsimile apparatus receives signals representing black, white and various gradations of gray. The apparatus generates a control signal having a magnitude varying with the gradation of gray from white to black corresponding to the gradations of gray at a remotely located document. A stylus for marking on a copy medium is driven by a stylus drive circuitry which generates a stylus drive signal in response to the control signal which is substantially linearly related to the control signal when the magnitude of the control signal is above and below a threshold and has a step change at the threshold.
    Type: Grant
    Filed: April 20, 1979
    Date of Patent: June 30, 1981
    Assignee: Exxon Research & Engineering Co.
    Inventor: John H. Kirk, Jr.