Patents by Inventor David D. Barnes

David D. Barnes 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).

  • Publication number: 20240125253
    Abstract: A valve actuation system comprises a first arm having a first arm contact surface and operatively connected to a valve actuation motion. A second arm having a second arm contact surface is operatively connected to the at least one engine valve. A discrete lost motion device is provided that is controllable between a first, motion conveying state and a second, motion absorbing state. The discrete lost motion devices comprises a plunger contact surface and a housing contact surface. The housing contact surface is configured to engage one of the first or second arm contact surfaces, and the plunger contact surface is configured to engage another of the first and the second arm contact surfaces. The first and second arm contact surfaces, the housing contact surface and the first plunger contact surface are configured to support the discrete lost motion device between the first arm and the second arm.
    Type: Application
    Filed: October 10, 2023
    Publication date: April 18, 2024
    Inventors: Bruce A. SWANBON, Justin D. BALTRUCKI, Robb JANAK, G. Michael GRON, JR., John MANDELL, Marc B. SILVA, Tyler HINES, Matei ALEXANDRU, Austen P. METSACK, Gabriel S. ROBERTS, P. Douglas AUBIN, Nathaniel P. HASSALL, John Jerl PURCELL, III, Adam C. CECIL, David M. BARNES
  • Patent number: 8217936
    Abstract: A method, system, and computer-readable storage medium are disclosed for minimizing tessellation of surfaces. A first plurality of polygons may be generated, wherein the first plurality of polygons are adjacent to a plurality of exterior curves of a surface. Each of the first plurality of polygons comprises at least one outside edge approximating a portion of one of the exterior curves within a first flatness tolerance. A second plurality of polygons may be generated, wherein the second plurality of polygons are on the interior of the surface. Each of the second plurality of polygons comprises a plurality of inside edges approximating portions of interior curves of the surface within a second flatness tolerance. The first flatness tolerance may be smaller than the second flatness tolerance.
    Type: Grant
    Filed: May 30, 2008
    Date of Patent: July 10, 2012
    Assignee: Adobe Systems Incorporated
    Inventors: David D. Barnes, Douglas R. Becker, Dennis Kauffman, Kazuhiro Toyoda, Rebecca E. Hauser
  • Patent number: 7948489
    Abstract: A method, system, and computer-readable storage medium are disclosed for minimizing tessellation of surfaces. A first plurality of polygons may be generated, wherein the first plurality of polygons are adjacent to a plurality of boundaries of a surface. Each of the first plurality of polygons comprises at least one outside edge approximating a straight line within a first flatness tolerance. A second plurality of polygons may be generated, wherein the second plurality of polygons are on the interior of the surface. Each of the second plurality of polygons comprises a plurality of inside edges approximating the straight line within a second flatness tolerance. The first flatness tolerance may be smaller than the second flatness tolerance.
    Type: Grant
    Filed: May 30, 2007
    Date of Patent: May 24, 2011
    Assignee: Adobe Systems Incorporated
    Inventors: David D. Barnes, Douglas R. Becker, Dennis Kauffman, Kazuhiro Toyoda
  • Patent number: 6118898
    Abstract: Methods and apparatus for compressing and decompressing multiple data sets (e.g., multiple color planes in a color image) in which interdependencies between the data sets, as well as spacial correlation within each data set, are used to create a plurality of compressed output data sets wherein one of the compressed output data sets includes data relating to all of the original uncompressed data sets and wherein each of the remaining output data sets includes data relating only to a particular one of the original uncompressed data sets. Advantageously, the disclosed techniques provide compression ratios approaching those of known vector compression algorithms while simultaneously providing decompression memory usage characteristics analogous to those found in planar compression systems. Thus, exemplary embodiments of the invention simultaneously provide relatively low peak and average memory requirements, corresponding to relatively low memory cost and relatively high data throughput, respectively.
    Type: Grant
    Filed: April 10, 1997
    Date of Patent: September 12, 2000
    Assignee: Apple Computer, Inc.
    Inventors: Kok S. Chen, David D. Barnes