Chun C Tsai

US Patent:

7212374, May 1, 2007

Filed:

Oct 14, 2005

Appl. No.:

11/250649

Inventors:

Zhi Wang - San Jose CA, US
Jenghung Chen - Cupertino CA, US
Chun Sei Tsai - Tustin CA, US
Carl E. Barlow - Lake Forest CA, US

Assignee:

Western Digital Technologies, Inc. - Lake Forest CA

International Classification:

G11B 5/596
G11B 21/02

US Classification:

360 7814, 360 7804

Abstract:

Disclosed is a disk drive to characterize misaligned servo wedges. A disk of the disk drive includes a plurality of circumferential tracks, in which, each track includes a plurality of servo wedges spaced sequentially around the circumference of the track wherein the servo wedges may be misaligned relative to the head of the disk drive that moves about a pivot. A servo controller is used to characterize the misaligned servo wedges relative to the head during a seek operation by implementing the following operations: commanding the head to perform a seek operation from a starting track to an ending track; obtaining samples of wedge-to-wedge time (WTWT) values corresponding to time intervals between identified servo wedges for sampled tracks traversed during the seek operation; calculating WTWT variations for each sample; and calculating a calibrated misalignment value for each sample based upon WTWT variations.

US Patent:

8263332, Sep 11, 2012

Filed:

Oct 11, 2007

Appl. No.:

11/871023

Inventors:

Chun Tsai - Stanford CA, US
Seonhi Kim - Menlo Park CA, US
Gilbert Chu - Stanford CA, US

Assignee:

The Board of Trustees of the Leland Stanford Junior University - Palo Alto CA

International Classification:

C12Q 1/68
C12P 1/00
C12P 19/00
C12P 19/26
C12P 19/28
C12P 19/30
C12P 19/34

US Classification:

435 61, 435 41, 435 72, 435 84, 435 85, 435 89, 435 911, 435 915, 435 9152

Abstract:

A mismatched end DNA ligase is provided, which ligates two single strands to each other at a high efficiency, even if the other two single strands are not compatible. In one embodiment, the polypeptides of the ligase are Ku, Cernunnos, and XRCC4/Ligase4 (XL). This association can ligate DNA ends with a 3′ overhang to a recessed 5′ end, to a blunt end, or to a compatible end. In another embodiment, the proteins are Ku, Cernunnos, XRCC4/Ligase4 (XL) and DNA-PK.

US Patent:

20170082605, Mar 23, 2017

Filed:

Dec 5, 2016

Appl. No.:

15/369566

Inventors:

- PALO ALTO CA, US
Chun J. TSAI - Cupertino CA, US
Matthew William KANAN - Palo Alto CA, US
Gilbert CHU - Palo Alto CA, US

Assignee:

THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITY - PALO ALTO CA

International Classification:

G01N 33/49
G01N 27/407

Abstract:

A method for measuring ammonia in a blood sample may involve positioning the blood sample in proximity with an ammonia gas sensor, generating a current with the ammonia gas sensor in response to ammonia gas released from the blood sample, and measuring the current generated by the ammonia gas sensor, using a current measurement member coupled with the ammonia gas sensor. A device for measuring an ammonia level in a blood sample may include a blood sample containment member, an ammonia gas sensor coupled with the blood sample containment member, and a current measurement member coupled with the ammonia gas sensor. The method and device may be used to measure an ammonia level in a blood sample as small as one drop of blood, or approximately 0.05 mL of blood.

US Patent:

20170030893, Feb 2, 2017

Filed:

Oct 14, 2016

Appl. No.:

15/293935

Inventors:

- Palo Alto CA, US
Chun J. TSAI - Cupertino CA, US
Matthew William KANAN - Palo Alto CA, US
Gilbert CHU - Palo Alto CA, US

International Classification:

G01N 33/49
G01N 27/407
G01N 33/487

Abstract:

A method for measuring ammonia in a blood sample may involve positioning the blood sample in proximity with an ammonia gas sensor, generating a current with the ammonia gas sensor in response to ammonia gas released from the blood sample, and measuring the current generated by the ammonia gas sensor, using a current measurement member coupled with the ammonia gas sensor. A device for measuring an ammonia level in a blood sample may include a blood sample containment member, an ammonia gas sensor coupled with the blood sample containment member, and a current measurement member coupled with the ammonia gas sensor. The method and device may be used to measure an ammonia level in a blood sample as small as one drop of blood, or approximately 0.05 mL of blood.

US Patent:

20150226702, Aug 13, 2015

Filed:

Feb 11, 2015

Appl. No.:

14/619609

Inventors:

- Palo Alto CA, US
Chun J. Tsai - Cupertino CA, US
Matthew William Kanan - Palo Alto CA, US
Gilbert CHU - Palo Alto CA, US

International Classification:

G01N 27/42

Abstract:

A method for measuring ammonia in a blood sample may involve positioning the blood sample in proximity with an ammonia gas sensor, generating a current with the ammonia gas sensor in response to ammonia gas released from the blood sample, and measuring the current generated by the ammonia gas sensor, using a current measurement member coupled with the ammonia gas sensor. A device for measuring an ammonia level in a blood sample may include a blood sample containment member, an ammonia gas sensor coupled with the blood sample containment member, and a current measurement member coupled with the ammonia gas sensor. The method and device may be used to measure an ammonia level in a blood sample as small as one drop of blood, or approximately 0.05 mL of blood.