Patents by Inventor Donald G. Allen

Donald G. Allen 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: 20090057160
    Abstract: A method for manufacturing a write head with a helical coil having a very small and well controlled spacing between adjacent coil leads. The method includes forming a first set of coil leads, then conformally depositing a thin layer of electrically insulating material such as alumina over the first set of coil leads and over the substrate. An electrically conductive seed layer is then deposited over the thin layer of non-magnetic, electrically insulating material An electrically conductive material such as Cu is then deposited by electroplating in order to form a second set of electrically conductive leads interspersed within the first set of electrically conductive leads, each of the second set of leads being separated from the second set of leads by a portion of the thin layer of non-magnetic, electrically insulating material.
    Type: Application
    Filed: August 27, 2007
    Publication date: March 5, 2009
    Inventors: Donald G. Allen, Ming Jiang, Jennifer Ai-Ming Loo, Aron Neuhaus, Vladimir Nikitin, Yuan Yao
  • Publication number: 20080002290
    Abstract: A magnetic recording head for use in perpendicular magnetic recording having a design that allows the write coil to be manufactured by a damascene process for increased coil pitch and reduced coil resistance. The magnetic write head includes a photoresist dam structure that allows a hard baked photoresist to be formed that does not extend to the air bearing surface (ABS). Since the photoresist dam prevents the hard baked photoresist from reaching the ABS, the a damascene process, in which the hard baked photoresist remains in the finished write head, can be used to produce the write head. The use of such a damascene process advantageously allows the space between the coil turns to be reduced, which maximizes the number of turns that can be used and also maximizes the number width to which the coil turns can be constructed, thereby minimizing the electrical resistance of the write coil.
    Type: Application
    Filed: June 30, 2006
    Publication date: January 3, 2008
    Inventors: Donald G. Allen, Edward Hin Pong Lee, Jennifer Ai-Ming Loo
  • Patent number: 7030035
    Abstract: To remove unwanted electrostatic charge from a substrate or substrate clamping mechanism in a plasma processing chamber following the plasma processing of the substrate, the process of shutting down the RF power supply is altered. Specifically, the present invention is a stepped RF power shut down sequence in which the RF power is lowered in a first step from full power to approximately 5 to 10 watts for a short period of time, such as approximately 1 second, and thereafter the RF power is turned off. As a result of this RF power shut down sequence, with its intermediate step, the plasma during the intermediate step acts to neutralize or discharge the electrostatic charge that has built up upon the wafer and/or clamping mechanism during full power operation. When the electrostatic charge has been removed, the wafer sticking problem is resolved.
    Type: Grant
    Filed: May 14, 2004
    Date of Patent: April 18, 2006
    Assignee: Hitachi Global Storage Technologies Netherlands, B.V.
    Inventors: Donald G. Allen, Richard Jule Contreras, Michael Feldbaum, Dominic Frank Truchetta
  • Patent number: 6955747
    Abstract: The present invention overcomes the drawbacks and limitations described above by providing a paddle assembly having a paddle that moves in a bidirectional fashion for agitating solution in a container of a plating cell. A follower is coupled to the paddle. The follower engages a rotatable cam and is propelled along the cam as the cam rotates. A drive mechanism rotates the cam.
    Type: Grant
    Filed: September 23, 2002
    Date of Patent: October 18, 2005
    Assignee: International Business Machines Corporation
    Inventors: Robert M. Browne, Donald G. Allen, Hank Reinstein, Todd Thomas
  • Publication number: 20040055876
    Abstract: The present invention overcomes the drawbacks and limitations described above by providing a paddle assembly having a paddle that moves in a bidirectional fashion for agitating solution in a container of a plating cell. A follower is coupled to the paddle. The follower engages a rotatable cam and is propelled along the cam as the cam rotates. A drive mechanism rotates the cam.
    Type: Application
    Filed: September 23, 2002
    Publication date: March 25, 2004
    Applicant: INTERNATIONAL BUSINESS MACHINES
    Inventors: Robert M. Browne, Donald G. Allen, Hank Reinstein, Todd Thomas
  • Patent number: 6145212
    Abstract: A fixture for interacting with an exhaust system having exhaust pipes and mufflers and an image of the exhaust system, the image having location indicia locating the fixture on the image, displacement data associated with the location indicia indicates an alignment point in space above the image, the fixture comprising at least two stands adapted to lie in a selected positions relative to the image, an alignment mark on the stands, the alignment mark being adapted to align the stands with the location indicia on the image, and at least two modules, a plurality of holders configured differently from one another to be attached to a module, each holder defining a coordinate point that moves relative to the stand and image in response to movement of the module relative to the stand, the plurality of holders including at least one pipe holder configured to receive the exhaust pipe therein to position a central axis of the exhaust pipe at the coordinate point and a muffler holder configured to cooperate with anothe
    Type: Grant
    Filed: July 17, 1998
    Date of Patent: November 14, 2000
    Assignee: ArvinMeritor, Inc.
    Inventors: Charles J. Geise, Karl F. Cummings, William C. Tuttle, Larry A. Couchman, Donald M. Searcy, Donald G. Allen
  • Patent number: 6115200
    Abstract: The present invention is a method and apparatus for preventing a write operation to a storage medium of a data storage system in response to a shock event which excites the component modes of the data storage system. In accordance with the invention, an apparatus is provided which determines the occurrence of a shock event which causes post-shock movement of the transducer resulting from excitation of one or more of the component modes of the data storage system, measures the movement of the transducer for at least a predetermined period of time after the shock event, and prevents the write operation until the movement of the transducer is less than a predetermined threshold throughout this predetermined period of time.
    Type: Grant
    Filed: February 3, 1997
    Date of Patent: September 5, 2000
    Assignee: International Business Machines Corporation
    Inventors: Donald G. Allen, Louis Joseph Serrano
  • Patent number: D253722
    Type: Grant
    Filed: August 2, 1977
    Date of Patent: December 18, 1979
    Inventor: Donald G. Allen