David W T Chen

US Patent:

6562215, May 13, 2003

Filed:

Aug 7, 2000

Appl. No.:

09/633420

Inventors:

Charles Scott Nelson - Clio MI
David K. Chen - Rochester Hills MI
Lora B. Younkman - Grand Blanc MI
Raymond L. Bloink - Swartz Creek MI
Kaius K. Polikarpus - Grand Blanc MI
Walter T. Symons - Grand Blanc MI

Assignee:

Delphi Technologies, Inc. - Troy MI

International Classification:

G01N 27407

US Classification:

204784, 204424, 204426

Abstract:

Disclosed herein is a planar exhaust gas sensor for sensing the partial pressure of a gas in an exhaust. The sensing element has a modified, non-rectangular overall geometry. A terminal end of the element, onto which external sensor circuits can be attached, has a larger width than a sensor end of the element, in which is located the sensing cell. The reduced size of the sensor end of the element relative allows for more rapid attainment of operating temperature and lower energy consumption.

US Patent:

6957564, Oct 25, 2005

Filed:

Feb 25, 2003

Appl. No.:

10/373491

Inventors:

Charles Scott Nelson - Clio MI, US
Mark R. McClanahan - Goodrich MI, US
David K. Chen - Rochester Hills MI, US
Russell H. Bosch - Gaines MI, US

Assignee:

Delphi Technologies, Inc. - Troy MI

International Classification:

G01H027/00

US Classification:

73 2331, 374144

Abstract:

Disclosed herein is an impact absorber for an exhaust sensor. The impact absorber comprises a collar of deformable material disposed around a housing of the exhaust sensor. The collar extends radially outward from the housing. The collar may be formed from a material selected to degrade at exhaust temperature, or the collar may be formed from a material that provides radiation shielding to a portion of the sensor after installation. The collar may be disposed around a sealing gasket. A wall may be disposed around at least a portion of a perimeter of the collar, the wall being spaced apart from a plurality of facets formed on the housing to form a recess for receiving a socket wrench tool.

US Patent:

7062556, Jun 13, 2006

Filed:

Nov 22, 1999

Appl. No.:

09/447400

Inventors:

David T. Chen - Evanston IL, US
Philip J. Fleming - Glen Ellyn IL, US

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

G06F 15/173
G06F 15/16

US Classification:

709226, 709223, 709203, 709201

Abstract:

A communication system network () having a plurality of servers (- through N), each having a load level based on serving a number of clients (- through M), a method includes grouping plurality of servers (- through N) into a plurality of server groups G through Gk (- through k) respectively having load levels progressively from a least amount of load level to a most amount of load level, calculating a plurality of time periods T through Tk corresponding to the server groups G through Gk, assigning load to a server selected from the servers in the server group G from an initial time until expiration of the time period T, after expiration of each of the time periods T through Tk measured from the initial time, load assignment takes place by assigning load to a server selected from the servers in the server groups from G and and at least one other server group, in server groups G through Gk, corresponding to an expiring time period.

US Patent:

7471621, Dec 30, 2008

Filed:

Apr 6, 2006

Appl. No.:

11/399630

Inventors:

David T. Chen - Palatine IL, US
Kadathur S. Natarajan - Wilmette IL, US
Ivan N. Vukovic - Arlington Heights IL, US

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04J 11/00

US Classification:

370208, 370210, 370329, 4554521

Abstract:

A base station has a transmission element to wirelessly transmit at least one data frame. The at least one data frame has a predetermined uplink allocation and a predetermined downlink allocation. A detection element detects a congestion condition. When the congestion condition is detected, the transmission element transmits a request to at least one neighboring base station for an expansion of the predetermined uplink allocation or the predetermined downlink allocation. A reception element receives a signal from the at least one neighboring base station. A processing element expand the one of the predetermined uplink allocation or the predetermined downlink allocation by a specified amount in response to the signal indicating the specified amount for a mutually agreed time, or number of symbols or frames.

US Patent:

20070177545, Aug 2, 2007

Filed:

Jan 30, 2006

Appl. No.:

11/342518

Inventors:

Kadathur Natarajan - Wilmette IL, US
Masahito Asa - Tokyo, JP
David Chen - Palatine IL, US

International Classification:

H04Q 7/00

US Classification:

370331000

Abstract:

At least one operating condition is determined for a first mobile subscriber station () that is operating in an orthogonal frequency division multiple access (OFDMA) network. The first mobile subscriber station () is handed off from a base station () to a relay station (). Based upon the at least one operating condition, at least one sub-channel is subsequently assigned from a plurality of sub-channels of a frequency band to the first mobile subscriber station () in order to provide an assigned sub-channel resource to the first mobile subscriber station (). The assigned sub-channel resource can potentially be any of the plurality of sub-channels of the frequency band.

US Patent:

20070206500, Sep 6, 2007

Filed:

Mar 2, 2006

Appl. No.:

11/276488

Inventors:

Mohsin Mollah - Chiba-shi, JP
Masahito Asa - Katsushika-ku, Tokyo, JP
David Chen - Palatine IL, US
Ryutaro Hamasaki - higashikurume-shi, Tokyo, JP
Tetsu Ikeda - Kawasaki, Kanagawa, JP

Assignee:

MOTOROLA, INC. - Schaumburg IL

International Classification:

H04J 1/16
H04J 3/08

US Classification:

370235000, 370315000

Abstract:

A base station () will instruct relay stations () to periodically skip transmissions of their control information when control messaging by all relay stations exceeds a predetermined threshold (e.g., 50% of radio resource capacity). The base station determines the relay stations to skip by periodically ranking the relay stations and skipping control messages for relay stations having a lowest rank.

US Patent:

20080219214, Sep 11, 2008

Filed:

Mar 9, 2007

Appl. No.:

11/684024

Inventors:

David T. Chen - Palatine IL, US
Matt J. Dillon - Boulder CO, US

Assignee:

MOTOROLA, INC. - Schaumburg IL

International Classification:

H04Q 7/00

US Classification:

370331

Abstract:

A system and method for managing a multihop relay station in a wireless wide-area communication network includes determining whether any mobile stations are being served by the relay station. If not, inactivating the relay station by; inactivating transmitted signals from the relay station, leaving a receiver active, and monitoring signals on the active receiver. Whereafter, estimating a channel quality of at least one mobile station from the monitored signals by the inactive relay station, and activating the relay station in response to the monitored signals indicating that a channel quality of the mobile station will improve when being served by the relay station.

US Patent:

20080285473, Nov 20, 2008

Filed:

May 14, 2007

Appl. No.:

11/747939

Inventors:

David T. Chen - Palatine IL, US
Philip J. Fleming - Glen Ellyn IL, US
Fan Wang - Chicago IL, US

Assignee:

MOTOROLA, INC. - Schaumburg IL

International Classification:

H04J 3/14

US Classification:

370252, 370280

Abstract:

A method, base station, and wireless communications system for interlacing Access and Backhaul frames in a Time Division Duplex wireless communication system. The method includes monitoring Access traffic and Backhaul traffic (). Access traffic characteristics, Backhaul traffic characteristics, and corresponding frame control overhead information are determined in response to the monitoring (). The method also includes determining an amount of time required to deliver a substantially equal amount of bearer Access traffic and Backhaul traffic (). A frame interlacing ration is determined () in response to determining the amount of time required to deliver a substantially equal amount of bearer Access traffic and Backhaul traffic. A set of Access frames () and a set of Backhaul frames () are interlaced on a frequency band using the determined frame interlacing ratio.