Joseph S Chan

US Patent:

6351020, Feb 26, 2002

Filed:

Nov 12, 1999

Appl. No.:

09/438618

Inventors:

Marc L. Tarabbia - Austin TX
Joseph Y. Chan - Austin TX
Geoffrey B. Hall - Austin TX

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H01L 2900

US Classification:

257532, 275307, 275595

Abstract:

A cumulative capacitor structure with desirably constant capacitance characteristics is disclosed. In one embodiment, the cumulative capacitor includes a set of four capacitors coupled in parallel between first and second terminals of the cumulative capacitor. In one embodiment, the first capacitor is comprised of a top plate formed of an n-type polysilicon coupled to the first terminal, a bottom plate comprised of a first accumulation/depletion region such as an n-well region coupled to the second terminal, and a first dielectric region between its top and bottom plates. The second capacitor has an n-type polysilicon terminal top plate coupled to the second terminal, an accumulation/depletion region bottom plate coupled to the first terminal, and a dielectric between its top and bottom plate. A third capacitor has a p-type polysilicon top plate coupled to the first terminal, an accumulation/depletion region bottom plate coupled to the second terminal, and a third dielectric region between its top and bottom plates. The fourth capacitor has a p-type polysilicon terminal coupled to the second terminal, an accumulation/depletion region bottom plate coupled to the first terminal, and a dielectric between its top and bottom plates.

US Patent:

6707339, Mar 16, 2004

Filed:

Nov 22, 2002

Appl. No.:

10/301992

Inventors:

Kiyoshi Kase - Austin TX
Joseph Y. Chan - Gurnee IL
Chunhe Zhao - Austin TX

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H03F 345

US Classification:

330255, 330260, 330261

Abstract:

An operational amplifier circuit ( ) uses a first operational amplifier ( ) to selectively provide a boosted drive current in response to an input signal voltage transitioning. The boosted driver current is used by a second operational amplifier ( ) having a single high gain stage ( ). The output drive current of the operational amplifier circuit ( ) is increased to a predetermined maximum value for a predetermined time after an input signal transition in order to source increased current to a capacitive or inductive load only during output signal transitions. Separate current boost circuits ( ) in each of the first and second operational amplifiers enable early signal transition detection and ensure continuation of increased current until completion of the signal transition.

US Patent:

6747558, Jun 8, 2004

Filed:

Apr 26, 2002

Appl. No.:

10/133270

Inventors:

Roderick E. Thorne - Palo Alto CA
Philip J. Keleshian - San Jose CA
Timothy R. Redler - Campbell CA
Joseph S. Chan - Milpitas CA
Nikola Cargonja - San Carlos CA

Assignee:

Savi Technology, Inc. - Sunnyvale CA

International Classification:

G08B 1324

US Classification:

340551, 3405456, 3405681

Abstract:

A device ( ) facilitates sealing and tracking of a container ( ). The device includes a bolt ( ) which extends through openings in a latch mechanism ( ) on the container. The bolt also passes through spaced coils ( ) of the seal device. The seal device uses one coil to generate a magnetic field, while monitoring the corresponding magnetic field induced in the other coil. Tampering with the bolt affects the magnetic field, which in turn permits the seal device to detect the tampering. The seal device periodically transmits wireless signals ( ), which can be remotely received for purposes of tracking the container and monitoring the integrity of the seal.

US Patent:

6765484, Jul 20, 2004

Filed:

Apr 24, 2001

Appl. No.:

09/841776

Inventors:

James G. Eagleson - San Jose CA
Joseph S. Chan - Milpitas CA
Nikola Cargonja - San Carlos CA

Assignee:

Savi Technology, Inc. - Sunnyvale CA

International Classification:

G08B 2600

US Classification:

340505, 3405721, 340 101, 340 103, 340 1041, 340993, 34082536, 700229, 34235707, 342450, 342457, 235384

Abstract:

An apparatus ( ) includes a signpost ( ) which transmits signpost signals ( ) to a tag ( ), which in turn transmits beacon signals ( ) to a reader ( ). One of the signpost and tag is mounted on an item to be tracked. A control system ( ) is responsive to the reader, and can cause the signpost to vary the signpost signal in a manner which varies at least one operational characteristic of the tag, such as a transmission rate, a transmission power, a tag identification code, a password, or an encryption code, or which shifts the tag between a normal operational mode and a low power operational mode in which its transmitter is disabled.

US Patent:

6940392, Sep 6, 2005

Filed:

Apr 24, 2001

Appl. No.:

09/841774

Inventors:

Joseph S. Chan - Milpitas CA, US
Nikola Cargonja - San Carlos CA, US

Assignee:

Savi Technology, Inc. - Sunnyvale CA

International Classification:

H04Q005/22

US Classification:

340 104, 364467, 375146, 340 101

Abstract:

An apparatus () includes a signpost () which transmits signpost signals () that are received by a tag (). The tag in turn transmits radio frequency beacon signals () which are received by a reader () The tag can vary the duration of the beacon signals, for example in dependence on whether it is currently receiving a signpost signal. Further, the tag can dynamically vary the transmission rate and/or transmission power of the beacon signals, for example following receipt of a signpost signal. Varying these parameters can facilitate compliance with governmental regulations.

US Patent:

7358856, Apr 15, 2008

Filed:

Mar 17, 2005

Appl. No.:

11/084126

Inventors:

Ravindra U. Rajapakse - San Francisco CA, US
Leo Shang-Hua Chang - San Carlos CA, US
Joseph Siufai Chan - Milpitas CA, US
Jeyappragash Jeyakeerthi - Santa Clara CA, US
Andrew Edward Savige Alcock - Singapore, SG

Assignee:

Savi Technology, Inc. - Sunnyvale CA

International Classification:

G08B 13/14

US Classification:

3405721, 3405682, 34053917

Abstract:

A conveyance tracking system provides two-phase transaction commit processing for synchronizing seal state information between a seal device attached to a conveyance and a host for tracking conveyances. The system uses a reader device for synchronization and communication between the seal device and host system regarding various operations, such as a lock operation, an unlock operation, and a clear tamper operation. In the first phase of the two-phase commit, the seal device prepares for the operation and the host executes the operation. In the second phase, the seal device fulfills the irreversible operation, ensuring that the seal state of the seal device and host are in sync.

US Patent:

7383332, Jun 3, 2008

Filed:

Apr 8, 2003

Appl. No.:

10/409415

Inventors:

James C. Chong - Orinda CA, US
Joseph L. Chan - Lafayette CA, US
Tushar M. Patel - San Francisco CA, US
Jean-Jacques Heler - Palo Alto CA, US
Chi Hong So - Pleasant Hill CA, US
Arthur Tsang - Walnut Creek CA, US
Robert S. Lam - Oakland CA, US
Raymond Chow - San Ramon CA, US
Henry Tang - Walnut Creek CA, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 15/173

US Classification:

709224, 709223

Abstract:

A method, system and computer program are provided for problem determination in an enterprise computer system in a distributed environment. In the method, information is obtained regarding the enterprise applications, and high-level information is presented to a user, with one or more prompts are provided to the user for more detailed information. In response to a request from a user for more detailed information about the application, more detailed information is provided to the user. Several levels of more detailed information about applications, including information as to individual threads, is available. The method also includes the steps of receiving instructions from an administrator to establish an account for a user, associating one or more servers with the account, and providing access to the corresponding user only to the associated servers. In the method, searches may be conducted for strings and requests, and identified strings and requests may be sorted by a variety of criteria.

US Patent:

7386404, Jun 10, 2008

Filed:

May 27, 2005

Appl. No.:

11/140587

Inventors:

Nikola Cargonja - San Carlos CA, US
Joseph S. Chan - Milpitas CA, US
Don H. Ahn - Sunnyvale CA, US

Assignee:

Savi Technology, Inc. - Mountain View CA

International Classification:

G01R 31/36

US Classification:

702 63

Abstract:

One aspect of the invention involves: periodically sampling a voltage of a battery and an ambient temperature in order to obtain a sample that includes a temperature value and a voltage value; saving each sample in a sample group; selecting a subset of the samples in the group, wherein the temperature value of each sample in the subset is lower than the temperature value of substantially all of the samples of the group other than the subset; and determining as a function of the voltage of at least one the sample in the subset whether the battery is subject to a low voltage condition.