Patents Represented by Attorney Nathan N. Kallman
  • Patent number: 7390266
    Abstract: A golf club is fabricated with at least one vertical stability plate and/or at least one horizontal stability plate at a club head. The golf club is provided with a stability plate and an asymmetrical wing, or a combination of the same, which are installed at an upper side or left and right sides of the head of the golf club such as a driver, wood or iron, for example. An aerodynamic force generated in a downward direction by the loft of the club face is compensated by asymmetric wings applying an aerodynamic lifting force to an upper direction of the club head during a swing of the club. Even when a golfer has a swing speed or posture problem when swinging a club, the head of the club is guided to rotate along a desired proper orbit. A golf ball can be hit by a sweet spot of the head face of the club due to the stability and compensating force for achieving a straight drive, and enhanced flying distance.
    Type: Grant
    Filed: June 19, 2006
    Date of Patent: June 24, 2008
    Inventor: Young Doo Gwon
  • Patent number: 6775902
    Abstract: A magnetic head is fabricated by providing a substrate with a planar surface, forming at least one cavity in the planar substrate, depositing a second yoke layer in the cavity, forming a second pole tip in the cavity in contact with the second yoke layer, patterning an inductive coil in the cavity, depositing a gap layer over the second pole tip, sputtering a first pole tip over the gap layer, etching the first and second pole tips and the gap layer to form a stack of layers, depositing a protective layer over the stack of layers, leveling the protective layer to expose the first pole tip, and patterning a first yoke layer in contact with the first pole tip.
    Type: Grant
    Filed: June 9, 2000
    Date of Patent: August 17, 2004
    Assignee: Western Digital (Fremont) Inc.
    Inventors: Yiming Huai, Durga P. Ravipati, Mark D. Thomas, Carlos Corona, William D. Jensen
  • Patent number: 6708389
    Abstract: A method of making a magnetic head suspension assembly includes attaching a slider with a magnetic head to an intermediate flexible circuit. The attached combination is then inserted into a spin stand tester for the testing of electrical performance. If the attached combination fails the test, it is discarded, thereby avoiding the cost of discarding an entire head suspension assembly. On the other hand, if the attached combination passes the test, it is mounted to a load beam to form the head suspension assembly. Thereafter, a flex circuit can be attached to the load beam and intermediate flexible circuit to provide electrical connections to the magnetic head through the intermediate flexible circuit.
    Type: Grant
    Filed: July 10, 2000
    Date of Patent: March 23, 2004
    Assignee: Western Digital (Fremont), Inc.
    Inventors: Carl J. Carlson, Daniel P. Schott
  • Patent number: 6701681
    Abstract: A double glass system is disclosed in which not only the sunbeams are completely shielded, but also the firefighting is made easier at a fire accident. An incombustible or combustion-resistant liquid with a pigment added therein is used as the solution to be supplied into the double glass. Thus the double glass can shield the sight and the sunbeams, and can serve as a compartment wall, while it is helpful to firefighting at a fire accident, because the solution generates a fire-suppressing gas upon being burned. Thus the functions of the double glass are diversified. Further, an opaque liquid such as mercury is used in place of the solution, so that a sunbeam-shielding effect, a sight blocking effect (to the required degree) and a mirror effect can be obtained. Mercury is supplied into double glass by expanding the mercury and the air by heating them, and therefore, a driving means such as pump is not required.
    Type: Grant
    Filed: February 12, 2002
    Date of Patent: March 9, 2004
    Assignee: Korea Houghton Corporation
    Inventor: Kwang Soon Kim
  • Patent number: 6687977
    Abstract: A magnetoresistive device includes a metal layer, formed over a substrate, in which a groove is formed. A magnetoresistive element is formed in the groove, forming two magnetoresistive element portions that are separated by a conductive element. A sense current applied to the metal layer flows through the two magnetoresistive element portions with a predominant current-perpendicular-to-plane component. The method includes techniques that are less complex and less expensive than submicron photolithography to form the above described magnetoresistive device with submicron geometries.
    Type: Grant
    Filed: February 20, 2001
    Date of Patent: February 10, 2004
    Assignee: Western Digital (Fremont), Inc.
    Inventors: Kenneth E. Knapp, Ronald A. Barr
  • Patent number: 6504676
    Abstract: A magnetic head includes pole tips with aligned sidewalls and a low head profile. The aligned sidewalls are formed by depositing a stack of pole tip layers on a substrate. The stack of layers are etched through a common overlying mask. The stack of layers is covered over and around with a protective layer which is then planarized such that the stack of layers is exposed. The protective layer is etched to a predetermined thickness above the substrate, which is thinner than the thickness of the stack of layers. An inductive coil layer is deposited on the etched protective layer and covered with an overlying magnetic yoke layer which is dielectrically separated from the coil layer. The yoke layer thus formed assumes a low profile curvature due to the thin structure of the protective layer on the substrate.
    Type: Grant
    Filed: December 10, 1999
    Date of Patent: January 7, 2003
    Assignee: Read-Rite Corporation
    Inventors: Hugh C. Hiner, Billy Wayne Crue, William D. Jensen, Lien-Chang Wang, Durga P. Ravipati
  • Patent number: 6487040
    Abstract: A magnetic head includes first and second pole tips separated by a nonmagnetic gap layer. The right side walls of the first and second pole tips are vertically aligned. Similarly, the left side walls of the first and second pole tips are vertically aligned. The side fringing flux is substantially reduced resulting in a magnetic head capable of writing data tracks with well defined boundaries. The fabrication of the magnetic head begins with forming a stack of layers on a substrate. The stack of layers includes a nonmagnetic layer sandwiched between the first pole tip layer and a sacrificial layer which is preferably made of a metal. A protective layer, such as alumina, is then deposited over and around the stack of layers. After planarization and ion milling, the sacrificial layer is exposed. The sacrificial layer is then etched away leaving a volume of space in the protective layer and above the gap layer. An inductive coil with associated dielectric layers are then deposited above the first pole layer.
    Type: Grant
    Filed: November 24, 1999
    Date of Patent: November 26, 2002
    Assignee: Read-Rite Corporation
    Inventors: Yun-Lin Hsiao, Lien-Chang Wang, Durga I. Ravipati, Hugh C. Hiner, William D. Jensen
  • Patent number: 6468436
    Abstract: A system and method for providing a head for reading data is disclosed. The method and system include providing a magnetoresistive element and providing a flux guide having a high resistivity. The magnetoresistive element has an end. The flux guide also has an end. The end of the flux guide is adjacent to the end of the magnetoresistive element.
    Type: Grant
    Filed: July 12, 2000
    Date of Patent: October 22, 2002
    Assignee: Read-Rite Corporation
    Inventors: Xizeng Shi, Hua-Ching Tong, Ming Zhao, Francis Liu
  • Patent number: 6459552
    Abstract: A thin film magnetic head employs pole tips members which are coplanar in a plane across the write gap to produce a written track whose width is determined by the thickness of the pole tip members. The coplanar write structure may be combined with a multilayer read sensor disposed in the write gap to produce a narrow trackwidth thin film magnetic head having both write and read capabilities.
    Type: Grant
    Filed: March 20, 2000
    Date of Patent: October 1, 2002
    Inventors: Francis H. Liu, Hua-Ching Tong, Samuel W. Yuan
  • Patent number: 6424507
    Abstract: A magnetoresistive read sensor fabricated on a substrate includes a ferromagnetic layer that is exchange coupled with an antiferromagnetic layer made of a defined composition of iridium manganese. A tantalum layer is used so that the exchange field and coercivity do not change with variations in annealing temperature. The antiferromagnetic layer is formed with a material composition of Irx Mn100-x, wherein x is in the range of 15<x>23. In an embodiment of a spin valve structure, the tantalum layer is disposed over the substrate and the antiferromagnetic layer is in direct contact with a pinned ferromagnetic layer. In another embodiment, the IrMn layer is formed over a soft active layer. In a third embodiment using exchange pinning, spaced IrMn regions are formed over the active magnetoresistive layer to define the sensor track width.
    Type: Grant
    Filed: April 3, 2000
    Date of Patent: July 23, 2002
    Assignee: Read-Rite Corporation
    Inventors: Marcos M. Lederman, Daniel A. Nepela, Hua-Ching Tong
  • Patent number: 6392850
    Abstract: Magnetic transducers are formed with common magnetic exchange layers capable of providing assertive and complementary signals. The transducers include an assertive transducer portion and a complementary transducer portion. Between the two transducer portions is a common bias portion which comprises an antiferromagnetic layer providing bias fields in different directions to the respective transducer portions. During normal operations, a current is directed into each of the transducer portions. The assertive transducer portion, being magnetically biased in one direction, generates a varying voltage as an assertive version of the electrical signal. The complementary transducer, being magnetically biased in another direction, generates another varying voltage as a complementary version of the electrical signal. In one embodiment, the transducer portions are implemented to operate as an anisotropic MR(AMR) sensor. In a second embodiment, the transducer portions operate as a giant MR(GMR) or spin valve sensor.
    Type: Grant
    Filed: October 19, 1998
    Date of Patent: May 21, 2002
    Assignee: Read-Rite Corporation
    Inventors: Hua-Ching Tong, Francis H. Liu, Minshen Tan, Robert Earl Rottmayer, Jian-Gang Zhu, Samuel W. Yuan
  • Patent number: 6349017
    Abstract: A magnetic head suspension assembly includes a load beam, a flexible member or flexure, and an air bearing slider. Disposed on the flexible member is a plurality of bonding pads. Bonding pads are also formed on the edge surfaces of the slider. The bonding pads of the slider and the corresponding bonding pads on the flexible member are attached to each other via bonding joints. One of the bonding pads is electrically linked to an electrostatic discharge (ESD) path and the other bonding pads are connected to electrical signal traces which convey electrical signals to and from magnetic transducers. The undesirable steps of epoxy application for adhering a slider to a flexure can be eliminated, thus resulting in a more reliable and accurately oriented slider in a magnetic head suspension assembly.
    Type: Grant
    Filed: February 21, 1997
    Date of Patent: February 19, 2002
    Assignee: Read-Rite Corporation
    Inventor: Daniel P. Schott
  • Patent number: 6339518
    Abstract: An air bearing slider used with a thin film magnetic head is formed with a corner recess and a taper at the leading edge. The taper is disposed between the corner recess and one side of the slider. A central polygon-shaped recess is bounded by pads which are joined by a connecting section. In an alternative embodiment, a recess at the leading edge separates the taper into sections. In another embodiment, a second corner recess is provided at the leading edge and the taper is disposed between the first and second corner recesses. The shaped recesses and tapers improve the flying characteristics of the slider and enhance air bearing stiffness. A single etch process is used to form the recesses and side reliefs of the slider.
    Type: Grant
    Filed: September 1, 1998
    Date of Patent: January 15, 2002
    Assignee: Read-Rite Corporation
    Inventors: Ciuter Chang, Christopher A. Lee, Mark J. Donovan
  • Patent number: 6330131
    Abstract: An air bearing slider for a magnetic head assembly is configured with taper flat outer rails and a recessed region between the rails in one embodiment of the invention, a hard wear-resistant layer is deposited over part of the rail area, with a thin residual layer over the remainder of the slider area, yielding a step in thickness near the load point. In another embodiment, the wear resistant layer appears only on the side rails. In an alternative embodiment using a tripad configuration of the air bearing surface, the hard wear-resistant layer is disposed on portions of all three pads. The invention allows control and minimization of the stiction forces between an air bearing slider and a magnetic disk, particularly during liftoff at the start of disk drive operation.
    Type: Grant
    Filed: September 17, 1993
    Date of Patent: December 11, 2001
    Assignee: Read-Rite Corporation
    Inventors: Daniel A. Nepela, Paul H. Schmidt
  • Patent number: 6329616
    Abstract: A power control apparatus, for directing an electrical power from a power source to a selected electrical appliance, includes a switch box having a plurality of activating switches and a main switch for controlling the flow of power to the switches, a unit for supplying power connected directly to the switch box and to the main switch without any intervening electrical outlets, and a plurality of conductor lines, each connected individually within the switch box to a respective one of the plurality of the switches and extending from the switch box, the ends of the conductor lines having connecting holes for a direct connection to the electrical appliances without any intervening switches, the switches and conductor lines being integrally formed with the switch box.
    Type: Grant
    Filed: September 5, 2000
    Date of Patent: December 11, 2001
    Inventor: Jae Ha Lee
  • Patent number: 6275354
    Abstract: A magnetic head includes first and second magnetic yoke layers which contact each other at a back closure region at one end and delineate a transducer gap at another end. A toroidal coil encompasses one of the yoke layers. The coil axis of the toroidal coil passes through the encompassed yoke layer. During data writing, electrical current passes through the toroidal coil inducing magnetic flux along the coil axis, which flux is efficiently and directly delivered to the transducer gap for writing on a recording medium. During data reading, magnetic flux intercepted by the transducer gap flows along the encompassed yoke layer and efficiently induces electrical current in the toroidal coil for amplification. In alternative embodiments, separate read transducers are disposed adjacent to the toroidal coils to form merged heads.
    Type: Grant
    Filed: January 21, 1998
    Date of Patent: August 14, 2001
    Assignee: Read-Rite Corporation
    Inventors: Yiming Huai, Zhupei Shi, Yong Shen, Billy Wayne Crue
  • Patent number: 6265672
    Abstract: A printed circuit board having multiple layers, includes: a copper film for removing signal interference and noise and matching impedance, formed between pads of a lowermost layer which are connected to of an uppermost layer.
    Type: Grant
    Filed: March 22, 1999
    Date of Patent: July 24, 2001
    Assignee: Simm Tech Co. Ltd.
    Inventors: Jae Suk Eum, Young Han Kim
  • Patent number: 6246547
    Abstract: A slider attaches to a low profile flexure to form a slider-flexure assembly. The flexure has no out-of-plane bends thereby minimizing slider-flexure assembly height. The slider has a top, a bottom, a leading edge and a trailing edge. The flexure includes a tongue having a proximal end and a distal end. The distal end of the tongue connects to the top of the slider. The proximal end of the tongue overhangs the leading edge of the slider. The flexure includes gimbal beams that diverge from the proximal end of the tongue so that the gimbal beams suspend the slider from beyond the leading edge of the slider, thus eliminating a need for out-of-plane bends in the flexure.
    Type: Grant
    Filed: February 16, 1999
    Date of Patent: June 12, 2001
    Assignee: Read-Rite Corporation
    Inventors: Jamshid Bozorgi, Mourad Zarouri
  • Patent number: 6237215
    Abstract: A test fixture for assembling and electrical testing of magnetic head includes a fixed baseplate, a cage, and an X-Y positioner that is adjustably mounted on the baseplate. The cage is formed of a flat, thin, elongated arm and is secured at its rear end to the X-Y positioner. The forward end of the cage extends into a notched section that surrounds part of the slider. A stationary mounting block supports and retains the suspension in a fixed position relative to the slider. In another embodiment, the rear end of the cage is secured to the stationary mounting block and the X-Y positioner supports the suspension.
    Type: Grant
    Filed: February 6, 1998
    Date of Patent: May 29, 2001
    Assignee: Read Rite Corporation
    Inventors: Michael D. Hunsaker, Barry W. Darr
  • Patent number: 6233125
    Abstract: A magnetoresistive device includes a metal layer, formed over a substrate, in which a groove is formed. A magnetoresistive element is formed in the groove, forming two magnetoresistive element portions that are separated by a conductive element. A sense current applied to the metal layer flows through the two magnetoresistive element portions with a predominant current-perpendicular-to-plane component. A method includes techniques that are less complex and less expensive than submicron photolithography to form the above described magnetoresistive device with submicron geometries. A system includes a read/write head that incorporates a magnetoresistive element formed in a groove of a metal layer.
    Type: Grant
    Filed: May 15, 2000
    Date of Patent: May 15, 2001
    Assignee: Read-Rite Corporation
    Inventors: Kenneth E. Knapp, Ronald A. Barr