Patents by Inventor David J. Shelley

David J. Shelley 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).

  • Thermal printer-plotter system for multi-directional printing and plotting
    Patent number: 4070680
    Abstract: A printer-plotter system is provided having a single horizontally movable, print-plot head comprising geometrically arranged thermal resistor elements which are processor-controlled for plotting continuous multi-directional line segments and for printing, while plotting, upper and lower case alphanumeric characters and punctuation characters in four orthogonal directions. Characters are printed in 5-columns-by-7-rows dot matrix form, with neighboring dots partly overlapping each other in order to impart a continuous or drawn appearance rather than a discontinuous dot appearance to the printed characters. The geometric arrangement of the head elements also provides for varying the width of line segments plotted along selected orthogonal directions.
    Type: Grant
    Filed: August 20, 1976
    Date of Patent: January 24, 1978
    Assignee: Hewlett-Packard Company
    Inventor: David J. Shelley
  • Thermal printer-plotter system for multi-directional printing and plotting
    Patent number: RE30743
    Abstract: A printer-plotter system is provided having a single horizontally movable, print-plot head comprising geometrically arranged thermal resistor elements which are processor-controlled for plotting continuous multi-directional line segments and for printing, while plotting, upper and lower case alphanumeric characters and punctuation characters in four orthogonal directions. Characters are printed in 5-columns-by-7-rows dot matrix form, with neighboring dots partly overlapping each other in order to impart a continuous or drawn appearance rather than a discontinuous dot appearance to the printed characters. The geometric arrangement of the head elements also provides for varying the width of line segments plotted along selected orthogonal directions.
    Type: Grant
    Filed: October 26, 1978
    Date of Patent: September 15, 1981
    Assignee: Hewlett-Packard Company
    Inventors: David J. Shelley, Rick A. Warp, Majid Azmoon