Thomas P Chang

US Patent:

6521902, Feb 18, 2003

Filed:

Aug 15, 2000

Appl. No.:

09/638507

Inventors:

Thomas Young Chang - Menlo Park CA
Michael Andrew Parker - Fremont CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H01J 3708

US Classification:

25049221, 2504923, 20429836, 2960313

Abstract:

The improved method for trimming a magnetic head utilizing a FIB tool includes a step of aligning the FIB tool milling boxes without imaging critical pole tip components and structure. The method includes the creation of an alignment box that is disposed in a known, fixed orientation relative to the FIB tool milling boxes. The FIB tool is aligned by imaging only the alignment box and by moving the alignment box relative to known pole tip structural characteristics that are disposed away from the critical pole tip components. The alignment box is visually aligned on non-sensitive pole tip components in such a manner that the milling boxes will be properly aligned relative to the sensitive pole tip components. FIB tool milling is thereafter performed within the milling boxes which have been accurately aligned without imaging of sensitive pole tip components.

US Patent:

6542331, Apr 1, 2003

Filed:

Apr 10, 2000

Appl. No.:

09/546576

Inventors:

Thomas Young Chang - Menlo Park CA
Terence Tin-Lok Lam - San Jose CA
Edward HinPong Lee - San Jose CA
Samuel Wonder Yuan - Saratoga CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G11B 531

US Classification:

360126, 360123

Abstract:

The magnetic head of the present invention includes a P pole having an opening formed therethrough, and a P pole that is formed over the opening. A second magnetic pole tip is positioned relative to the first magnetic pole such that the first magnetic pole is symmetrically disposed relative to the second magnetic pole tip. Induction coils may be helically wound around portions of the first and/or second magnetic poles, or, alternatively, a planar, spiral induction coil may be fabricated for use with the first and second magnetic poles. An enhanced embodiment includes a first magnetic pole tip piece having a length that defines the throat length of the magnetic head and a thickness that increases the gap at rearward portions of the second magnetic pole tip of the magnetic head.

US Patent:

6584676, Jul 1, 2003

Filed:

May 2, 2000

Appl. No.:

09/561659

Inventors:

Yu-En Percy Chang - Mountain View CA
Thomas Young Chang - San Jose CA
Michael A. Parker - Fremont CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G11B 5127

US Classification:

2960312, 2960307, 2960313, 2960315, 216 22, 360126

Abstract:

A method for finishing a pole tip trimmed read/write heat that includes a substrate with a pole tip structure having a shield, a shield/pole, and an outer pole. A gap region separates the pole and the shield/pole. First, pole tip trimming is performed to the read/write head to remove matter from the shield/pole, the pole, and the gap region. This defines a bridge composed of inward-facing extensions of the pole and shield/pole interconnected by an intervening region. This bridge separates recessed âtrenches,â each formed by removing a contiguous mass from the shield/pole, the gap region, and the pole. Next, an overlayer is applied over the pole tip structure, filling the recessed trenches. The coated structure is then trimmed to remove all coating material overlying the shield/pole and pole. Trimming is continued to additionally remove a top layer of the protrusions of the pole and shield/pole to remove any rounded edges created by pole tip patterning, resulting in a more distinct write head.

US Patent:

6943993, Sep 13, 2005

Filed:

Feb 11, 2003

Appl. No.:

10/364799

Inventors:

Thomas Young Chang - Menlo Park CA, US
Yingjian Chen - Fremont CA, US
Jing Zhang - San Jose CA, US
Heng Gong - Layton UT, US

Assignee:

Western Digital (Fremont), Inc. - Lake Forest CA

International Classification:

G11B005/39

US Classification:

360319

Abstract:

Side shield structures magnetically shielding a read sensor to block side reading of tracks on a magnetic media. The read heads include bottom and top magnetic shield layers, a read sensor or magnetically sensitive element between the bottom and top magnetic shield layers, and a side shield assembly formed of magnetically shielding material positioned between the bottom and top magnetic shield layers and adjacent at least a portion of the read sensor. In current-in-plane embodiments, the side shield assembly includes a pair of side shields of magnetically shielding material adjacent a lower portion of the read sensor formed on a lower read gap. In current-perpendicular-to-plane embodiments, the side shield assembly includes a pair of side shields extending from the bottom magnetic shield adjacent lower sides of the read sensor and/or a pair of side shields extending from the top magnetic shield adjacent upper sides of the read sensor.

US Patent:

8628867, Jan 14, 2014

Filed:

Sep 30, 2010

Appl. No.:

12/895564

Inventors:

Shuaigang Xiao - Fremont CA, US
Thomas Young Chang - Menlo Park CA, US
Yingguo Peng - San Ramon CA, US
David Kuo - Palo Alto CA, US
Kaizhong Gao - Eden Prairie MN, US
Thomas Patrick Nolan - Fremont CA, US
Ganping Ju - Pleasanton CA, US

Assignee:

Seagate Technology LLC - Cupertino CA

International Classification:

G11B 5/66

US Classification:

428831, 360131, 4288312

Abstract:

A perpendicular magnetic media includes a substrate, a patterned template, a seed layer and a magnetic layer. The patterned template is formed on the substrate and includes a plurality of growth sites that are evenly spaced apart from each other. The seed layer is formed over the patterned template and the exposed areas of the substrate. Magnetic material is sputter deposited onto the seed layer with one grain of the magnetic material nucleated over each of the growth sites. The grain size distribution of the magnetic material is reduced by controlling the locations of the growth sites which optimizes the performance of the perpendicular magnetic media.

US Patent:

20110106797, May 5, 2011

Filed:

Nov 2, 2009

Appl. No.:

12/610606

Inventors:

Ravi K. PALAKODETY - Redwood City CA, US
Wesley C. Lin - West Covina CA, US
Sachin Bhatkar - Sunnyvale CA, US
Jeongwoo Ko - Palo Alto CA, US
Thomas Chang - Foster City CA, US
Mohammad Faisal - Belmont CA, US

Assignee:

ORACLE INTERNATIONAL CORPORATION - Redwood Shores CA

International Classification:

G06F 17/30

US Classification:

707728, 707780, 707E17008, 707E17014

Abstract:

Systems, methods, and other embodiments associated with document relevancy are described. One example method includes receiving one or more query terms from a query on stored documents. A relevancy operator is run on a document clump that applies more than one type of matching operation between the query terms and the document clump in a single pass. The relevancy operator may also apply at least one heuristic on the document clump in a single pass. A document's relevancy to the query is predicted based, at least in part, on an output of the relevancy operator.

US Patent:

20210121619, Apr 29, 2021

Filed:

Oct 21, 2020

Appl. No.:

17/076610

Inventors:

- Fremont CA, US
Thomas Y. Chang - Menlo Park CA, US

International Classification:

A61M 1/30
A61M 1/16
A61M 1/34

Abstract:

An implantable or wearable kidney enclosure that is cylindrical, ovoid, or otherwise non-angular e.g., not rectangular or cuboid), having a circular or oval hemofilter that provides a blood flow pattern from an internal, central artery source radially outwards. Due to the efficient flow of the circular filter design, the enclosure can be made in a cylindrical low profile shape, resulting in a compact enclosure highly suitable for implantable and wearable dialysis applications.

US Patent:

20210115508, Apr 22, 2021

Filed:

Dec 30, 2020

Appl. No.:

17/137837

Inventors:

- Fremont CA, US
ShuaiGang XIAO - Fremont CA, US
David S. KUO - Palo Alto CA, US
Koichi WAGO - Sunnyvale CA, US
Thomas Young CHANG - Menlo Park CA, US

International Classification:

C12Q 1/6869
C12M 1/34

Abstract:

Apparatus and methods relating to DNA sequencing are provided. In one embodiment, a DNA sequencing device includes a nanochannel having a width that is approximately 0.3 nm to approximately 20 nm. A pair of electrodes having portions exposed to the nanochannel may form a tunneling current electrode (TCE) with an electrode gap of approximately 0.1 nm to approximately 2 nm, and more particularly about 0.3 nm to about 1 nm. In one embodiment, at least one of the pair of electrodes is formed as a suspended electrode. An actuator may be associated with the suspended electrode to displace it relative to the other electrode. In various embodiments, the nanochannel and/or the electrodes may be formed using thermal reflow processes to reduce the size of such features.