Patents by Inventor Roger A. Addy

Roger A. Addy 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).

  • Crowned conical bearing
    Patent number: 6019516
    Abstract: A bearing assembly including a bering cone (50) having a crowned bearing surface (56) with V-shaped grooves (60) that are shallow at their apex (62) and deepest at the outer edges (52, 54). When mated with a female bearing seat, lubricating fluid builds up along the midline of the bearing surface as the bearing seat rotates about the bearing cone.
    Type: Grant
    Filed: April 14, 1998
    Date of Patent: February 1, 2000
    Assignee: Seagate Technology, Inc.
    Inventors: Hans Leuthold, Matt L. Shumway, Alan L. Grantz, Roger A. Addy, Norbert S. Parsoneault, Samnathan Murthy, Mohamed M. Rahman
  • Hydrodynamic bearing arrangement having a structure permitting the removal of entrapped air
    Patent number: 5978175
    Abstract: Air which would otherwise be entrapped in an O-ring seal groove in a hydrodynamic bearing arrangement is removable from the seal groove by providing at least one passage between the seal groove and an adjacent thrust plate recess. The air is removed from the seal groove though the passages by drawing a vacuum at a lower end of the bearing arrangement. Preferably, the passages are formed, at least in part, by grooves defined in the upper surface of a land formed between the seal groove and the thrust plate recess. A method of forming the grooves is also disclosed.
    Type: Grant
    Filed: March 5, 1998
    Date of Patent: November 2, 1999
    Assignee: Seagate Technology, Inc.
    Inventors: David Wuester, Sr., Roger Addy