Edward V Denison

US Patent:

6465322, Oct 15, 2002

Filed:

Jan 15, 1998

Appl. No.:

09/007673

Inventors:

David Ziger - San Antonio TX
Edward Denison - Helotes TX
Pierre Leroux - San Antonio TX

Assignee:

Koninklijke Philips Electronics N.V. - Eindhoven

International Classification:

H01L 2176

US Classification:

438401, 438 14, 438975, 148DIG 102

Abstract:

Methods and structures for determining alignment during semiconductor wafer processing are described. In one implementation, two geometric shapes are formed at different elevations over a substrate and at least partially overlapping with one another. The two shapes are inspected for overlap to determine whether the two shapes are misaligned. If the shapes are misaligned, a magnitude of misalignment is determined from the degree of overlap of the two shapes. In another implementation, a pair of elevationally spaced-apart geometric shapes are used to translate shifts of the shapes in one direction into quantifiable shift magnitudes using another direction. In yet another implementation, shifts in both the X and Y direction are readily quantifiable through visual inspection.

US Patent:

6744594, Jun 1, 2004

Filed:

Dec 28, 2001

Appl. No.:

10/034567

Inventors:

Edward V. Denison - Erie CO
Mark Hennecken - Parker CO
Mark L. Watson - Louisville CO
Steven G. Trabert - Boulder CO

Assignee:

Storage Technology Corporation - Louisville CO

International Classification:

G11B 5265

US Classification:

360121, 360 7712

Abstract:

A servo track write head writes low frequency transitions for fine transverse positioning and high frequency fields providing additional information. The servo track write head includes a first write gap with at least one gap section at a first angle relative to a tape direction. A second write gap has at least one gap section at a second angle, not equal to the first angle. The first and second write gaps write low frequency transitions in each servo frame. A third write gap writes high frequency transitions in each servo frame.

US Patent:

6970331, Nov 29, 2005

Filed:

Aug 20, 2002

Appl. No.:

10/224011

Inventors:

Jing He - Boulder CO, US
Joseph M. Schmalhorst - Broomfield CO, US
Carl A. Helms - Lafayette CO, US
Edward V. Denison - Erie CO, US

Assignee:

Storage Technology Corporation - Louisville CO

International Classification:

G11B005/33

US Classification:

360314

Abstract:

A head includes first and second read modules. The first module has an MR element formed on a wafer having a grating directed along a first direction. The magnetization of the first module element is directed along the first direction. The first module element is biased with a first current directed along a direction such that magnetically stable operation of the element results, that is along an opposite second direction. The second module has an element formed on a wafer having a grating directed along the first direction. The second module is flipped respect to the first module such that the grating is directed along the second direction. The magnetization of the second module element is directed along the second direction. The second module element is biased with a second current directed along the direction opposite to the first current, i. e. , the second current is directed along the first direction.

US Patent:

7009818, Mar 7, 2006

Filed:

Dec 30, 2002

Appl. No.:

10/334349

Inventors:

Carl Stephen Arnold - Golden CO, US
Edward Virgil Denison - Erie CO, US
April Lynn Alstrin - Boulder CO, US

Assignee:

Storage Technology Corporation - Louisville CO

International Classification:

G11B 5/39

US Classification:

360320, 360319, 360126

Abstract:

A thin film magnetic head having one or more magneto-resistive (MR) elements. A thermally conductive stud is incorporated in an underlayer of the head, below the bottom shield of the MR element. This stud acts as a heat sink, and enhances the heat flow from the bottom shield to the substrate to thereby reduce thermal contact noise in the device, as well as allowing use of higher bias currents when reading signals from the media.

US Patent:

7079359, Jul 18, 2006

Filed:

Aug 22, 2005

Appl. No.:

11/209119

Inventors:

Jing He - Boulder CO, US
Joseph M. Schmalhorst - Broomfield CO, US
Carl A. Helms - Lafayette CO, US
Edward V. Denison - Erie CO, US

Assignee:

Storage Technology Corporation - Louisville CO

International Classification:

G11B 5/33

US Classification:

360314

Abstract:

A head includes first and second read modules. The first module has an MR element formed on a wafer having a grating directed along a first direction. The magnetization of the first module element is directed along the first direction. The first module element is biased with a first current directed along a direction such that magnetically stable operation of the element results, that is along an opposite second direction. The second module has an element formed on a wafer having a grating directed along the first direction. The second module is flipped respect to the first module such that the grating is directed along the second direction. The magnetization of the second module element is directed along the second direction. The second module element is biased with a second current directed along the direction opposite to the first current, i. e. , the second current is directed along the first direction.

US Patent:

7118814, Oct 10, 2006

Filed:

Mar 2, 2004

Appl. No.:

10/791257

Inventors:

Carl Stephen Arnold - Golden CO, US
Edward Virgil Denison - Erie CO, US
John P. Nibarger - Superior CO, US
Carl A. Helms - Lafayette CO, US

Assignee:

Storage Technology Corporation - Louisville CO

International Classification:

G11B 5/127
G11B 5/39

US Classification:

4288115, 428815, 36032412

Abstract:

An apparatus and method for step-stabilization of giant magnetoresistive (GMR) based read heads are provided. With the apparatus and method, gratings or periodic structures are generated in the underlayer of the magnetoresistive (MR) sensor stack and the edges, or “steps”, in these structures are the magnetically active features. These “steps” are oriented approximately parallel to the desired bias direction and provide a restoring force towards the bias direction for any perturbations, whether intrinsic or extrinsic. In the case of a GMR sensor, where the easy axis is parallel to the permanent magnet set direction, these stabilizer steps are oriented parallel to the magnetization direction of the permanent magnets.

US Patent:

7227726, Jun 5, 2007

Filed:

Nov 12, 2002

Appl. No.:

10/292044

Inventors:

Edward Virgil Denison - Erie CO, US
Herman C. Kluge - Erie CO, US

Assignee:

Storage Technology Corporation - Louisville CO

International Classification:

G11B 5/39

US Classification:

360315, 360320

Abstract:

A dual-stripe element magnetroresistive read head for reading information from a magnetic tape. The read head includes a first insulating layer, a first active magnetoresistive layer formed on the first insulating layer, a second insulating layer formed on the first active magnetoresistive layer, a second active magnetoresistive layer formed on the second insulating layer, and a third insulating layer formed on the second active magnetoresistive layer. The second active magnetoresistive layer is magnetostatically coupled to the first active magnetoresistive layer. A periodic structure is formed on a surface of the first insulator layer. As the remaining layers are formed on the first insulating layer, the periodic structure is replicated throughout the read head. Thus, the periodic structure formed on the first insulator layer stabilizes both the first and second active layers via magnetic domain pinning for both layers along the edges of the periodic structure.

US Patent:

7256969, Aug 14, 2007

Filed:

Jun 7, 2004

Appl. No.:

10/862287

Inventors:

Carl Stephen Arnold - Golden CO, US
Edward Virgil Denison - Erie CO, US
Carl Anthony Helms - Lafayette CO, US
Stein Klevdal - Niwot CO, US
Kevin D. McKinstry - Arvada CO, US
Mark Lee Watson - Louisville CO, US

Assignee:

Storage Technology Corporation - Louisville CO

International Classification:

G11B 5/127

US Classification:

360313

Abstract:

A method and system are provided for implementing discrete step stabilization of AMR read sensors in tape or disk drives. In one implementation, a plurality of discrete step stabilizers and AMR read sensor elements are arranged with a rotational symmetry coupled with a plane inversion for an odd number of steps, and no inversion for an even number of steps. Preferably, the steps are oriented at 45 degrees, or approximately parallel to the desired bias direction. For relatively narrow track widths (e. g. , approximately 5 microns), the edges of the sensor element nearest the permanent magnets are especially important to stabilize. Therefore, in one implementation, an edge of a stabilizer preferably intersects the edge of the sensor element at one half of the stripe height. Also, the rising and falling edges of the stabilizers do not always have the same slope. In order to compensate for the different slopes of a stabilizer's edges, the rising and falling edges of a stabilizer's pattern are interchanged by a “stabilizer phase” transformation to produce the complement (phase conjugate) of the stabilizer pattern.

Address:

2811 Prince Cir, Erie, CO 80516

Phone:

(303)6649363

VIN:

1HD1GX4137K331986

Make:

Cadillac

Model:

Escalade ESV AWD 4dr

Year:

2007