Patents by Inventor Tim O. Cheung

Tim O. Cheung 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: 7869180
    Abstract: An apparatus for providing electrostatic discharge protection includes a plurality of conductive circumferential extensions defined by overlapping circular voids between a first conductor surface and a second conductor surface.
    Type: Grant
    Filed: February 13, 2009
    Date of Patent: January 11, 2011
    Assignee: Research In Motion Limited
    Inventors: Tim O. Cheung, Douglas Edgar Fregin
  • Publication number: 20090154050
    Abstract: An apparatus for providing electrostatic discharge protection includes a plurality of conductive circumferential extensions defined by overlapping circular voids between a first conductor surface and a second conductor surface.
    Type: Application
    Filed: February 13, 2009
    Publication date: June 18, 2009
    Applicant: RESEARCH IN MOTION LIMITED
    Inventors: Tim O. Cheung, Douglas Edgar Fregin
  • Patent number: 7508644
    Abstract: An apparatus for providing electrostatic discharge protection includes a plurality of conductive circumferential extensions defined by overlapping circular voids between a first conductor surface and a second conductor surface.
    Type: Grant
    Filed: June 30, 2004
    Date of Patent: March 24, 2009
    Assignee: Research In Motion Limited
    Inventors: Tim O. Cheung, Douglas Edgar Fregin
  • Patent number: 7369388
    Abstract: An apparatus for providing electrostatic discharge protection includes a first conductive trace and a second conductive trace. The first conductive trace defines a first conductive periphery and is deposited on a first surface. The second conductive trace defines a second conductive periphery and is deposited on a second surface. The second surface is spaced apart from the first surface by a gap distance and in parallel relation so that a spark gap is defined by the gap distance between the first conductive periphery and the second conductive periphery.
    Type: Grant
    Filed: December 8, 2006
    Date of Patent: May 6, 2008
    Assignee: Research in Motion Limited
    Inventors: Tim O. Cheung, Douglas Edgar Fregin
  • Patent number: 7161784
    Abstract: An apparatus for providing electrostatic discharge protection includes a first conductive trace and a second conductive trace. The first conductive trace defines a first conductive periphery and is deposited on a first surface. The second conductive trace defines a second conductive periphery and is deposited on a second surface. The second surface is spaced apart from the first surface by a gap distance and in parallel relation so that a spark gap is defined by the gap distance between the first conductive periphery and the second conductive periphery.
    Type: Grant
    Filed: June 30, 2004
    Date of Patent: January 9, 2007
    Assignee: Research In Motion Limited
    Inventors: Tim O. Cheung, Douglas Edgar Fregin
  • Patent number: 5939133
    Abstract: A slider of the type for use with a rotatable magnetic disk is disclosed. The slider has two ends and a bottom surface which includes an air bearing surface. An adhesive layer and continuous coating of carbon is located on the air bearing surface. A method of sputter depositing this continuous layer of carbon upon the air bearing surface of the slider is also provided. The continuous layer of carbon is crown-shaped and deposited using the sputtering technique. The carbon is directed from a source at the air bearing surface of a slider. A mask is placed between the source and slider so that the carbon is deposited in a crown shape. When the slider is viewed from front to rear the maximum depth of the coating is less than about 6 to 10 nm, while at the ends of the slider the coating depth is near 0 nm. The resistivity of the protective carbon layer is controlled for the additional benefit of protection from damages by electrostatic discharge.
    Type: Grant
    Filed: April 25, 1997
    Date of Patent: August 17, 1999
    Assignee: Applied Magnetics Corporation
    Inventors: Srinivasan K. Ganapathi, Tim O. Cheung, Paul D. Frank, Robert B. Love, Allan F. Rice, Paul W. Smith
  • Patent number: 5654850
    Abstract: A slider of the type for use with a rotatable magnetic disk is disclosed. The slider has two ends and a bottom surface which includes an air bearing surface. An adhesive layer and continuous coating of carbon is located on the air bearing surface. A method of sputter depositing this continuous layer of carbon upon the air bearing surface of the slider is also provided. The continuous layer of carbon is crown-shaped and deposited using the sputtering technique. The carbon is directed from a source at the air bearing surface of a slider. A mask is placed between the source and slider so that the carbon is deposited in a crown shape. When the slider is viewed from front to rear the maximum depth of the coating is less than about 6 to 10 nm, while at the ends of the slider the coating depth is near 0 nm. The resistivity of the protective carbon layer is controlled for the additional benefit of protection from damages by electrostatic discharge.
    Type: Grant
    Filed: August 8, 1994
    Date of Patent: August 5, 1997
    Assignee: Applied Magnetics Corp.
    Inventors: Srinivasan K. Ganapathi, Tim O. Cheung, Paul D. Frank, Robert B. Love, Allan F. Rice, Paul W. Smith