Patents by Inventor William R Knight

William R Knight 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).

  • Patent number: 5563642
    Abstract: Disclosed is an inkjet print cartridge having an ink reservoir; a substrate having a plurality of individual ink firing chambers with an ink firing element in each chamber along a top surface of the substrate and having a first outer edge along a periphery of substrate; the first outer edge being in close proximity to the ink firing chambers. The ink firing chambers are arranged in a first chamber array and a second chamber array and with the firing chambers spaced so as to provide 600 dots per inch printing. An ink channel connects the reservoir with the ink firing chambers, the channel including a primary channel connected at a first end with the reservoir and at a second end to a secondary channel; the primary channel allowing ink to flow from the ink reservoir, around the first outer edge of the substrate to the secondary channel along the top surface of the substrate so as to be proximate to the ink firing chambers.
    Type: Grant
    Filed: October 6, 1994
    Date of Patent: October 8, 1996
    Assignee: Hewlett-Packard Company
    Inventors: Brian J. Keefe, May F. Ho, Kenneth J. Courian, Steven W. Steinfield, Winthrop D. Childers, Ellen R. Tappon, Kenneth E. Trueba, Terri I. Chapman, William R. Knight, Jules G. Moritz, III
  • Patent number: 5371527
    Abstract: An orificeless thin film printhead for an ink jet pen which comprises a substrate having a plurality of vortex activators thereon, and ink dispensing means located adjacent to the substrate for providing a thin layer of ink of a controlled thickness over the surfaces of the vortex activators. A protective cover is disposed on the surface of the substrate and has one or more slots or other openings therein operative to expose the vortex activators during ink jet printhead operation. When each vortex activator is energized, the energy transferred from the surface of the activator into the liquid film creates a microjet and a shear force therein, followed by the formation of a vortex ring in the ink film.
    Type: Grant
    Filed: April 25, 1991
    Date of Patent: December 6, 1994
    Assignee: Hewlett-Packard Company
    Inventors: Robert J. Miller, William R. Knight
  • Patent number: 4882595
    Abstract: The use of lumped resistive elements (28) in an ink feed channel (10) between an ink-propelling element, such as a resistor, (12) and an ink supply plenum (14) provides a means of achieving resistive decoupling and meniscus resonance control with a minimum of deleterious side effects and design compromises typical of prior art solutions. A secondary constriction (30) in the ink feed channel is defined by a width W.sub.2 sufficient to provide physical support for the resistive elements while avoiding resistance to ink refill. The printhead further comprises lead-in lobes (38) for assisting in purging any bubbles in the ink. The lobes are disposed between the projections and the plenum chamber and separate one pair of projections from a neighboring pair.
    Type: Grant
    Filed: January 25, 1989
    Date of Patent: November 21, 1989
    Assignee: Hewlett-Packard Company
    Inventors: Kenneth E. Trueba, William R. Knight, Niels J. Nielsen
  • Patent number: 4353218
    Abstract: A heat transfer device is described that can be operated as a heat pump or refrigerator, which utilizes a working fluid that is continuously in a liquid state and which has a high temperature-coefficient of expansion near room temperature, to provide a compact and high efficiency heat transfer device for relatively small temperature differences as are encountered in heating or cooling rooms or the like. The heat transfer device includes a pair of heat exchangers that may be coupled respectively to the outdoor and indoor environments, a regenerator connecting the two heat exchangers, a displacer that can move the liquid working fluid through the heat exchangers via the regenerator, and a means for alternately increasing and decreasing the pressure of the working fluid. The liquid working fluid enables efficient heat transfer in a compact unit, and leads to an explosion-proof smooth and quiet machine characteristic of hydraulics.
    Type: Grant
    Filed: May 28, 1980
    Date of Patent: October 12, 1982
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: John C. Wheatley, Douglas N. Paulson, Paul C. Allen, William R. Knight, Paul A. Warkentin