Patents by Inventor John B. Smyth

John B. Smyth 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).

  • Particle tolerant printhead
    Patent number: 6007188
    Abstract: Islands of barrier layer material of an inkjet printhead are disposed between an ink source and the ink feed channels leading to the ink firing chambers to filter particles in the ink. Dimensions of the ink feed channels and ink ejecting orifices have been reduced in size and the thickness of the barrier layer has been made thinner. The nominal size of the filter pores is less than the barrier layer thickness while the width of the ink feed channels and the bore diameter of the orifices is larger than the barrier layer thickness.
    Type: Grant
    Filed: July 31, 1997
    Date of Patent: December 28, 1999
    Assignee: Hewlett-Packard Company
    Inventors: Cheryl A. MacLeod, John B. Smyth, David Pidwerbecki, Joe E. Stout