Steven K P Chan

US Patent:

7015765, Mar 21, 2006

Filed:

Jul 26, 2004

Appl. No.:

10/898743

Inventors:

Kenneth Shepard - Ossining NY, US
Steven Chan - Yonkers NY, US

Assignee:

The Trustees of Columbia in the City of New York - New York NY

International Classification:

H03B 5/18
G06F 1/04

US Classification:

331117D, 331 2, 331 36 C, 331 56, 331 96, 331177 V, 713500

Abstract:

A circuit for distributing a clock signal in an integrated circuit includes a capacitive clock distribution circuit having at least conductor therein. At least one inductor is formed in a metal layer of the integrated circuit and is coupled to the clock distribution circuit. The inductor, generally in the form of a number of spiral inductors distributed throughout the integrated circuit, provides an inductance value selected to resonate with the capacitive clock distribution circuit. By operating the clock distribution circuit at resonance, power dissipation is reduced while skew and jitter performance can be improved.

US Patent:

7145408, Dec 5, 2006

Filed:

Jan 13, 2003

Appl. No.:

10/501278

Inventors:

Kenneth Shepard - Ossining NY, US
Steven Chan - Yonkers NY, US

Assignee:

The Trustees of Columbia University in the City of New York - New York NY

International Classification:

H03B 5/12

US Classification:

331117D, 337117 R, 337117 FE, 337167, 337117 DP

Abstract:

A circuit for distributing a clock signal in an integrated circuit includes a capacitive clock distribution circuit. At least one additional inductor is formed in a metal layer of the integrated circuit and is coupled to the clock distribution circuit. The inductor, which may distributed throughout the integrated circuit, has an inductance value selected to resonate with impedance of the capacitive clock distribution circuit. By operating the clock distribution circuit at resonance, power dissipation is reduced while skew and jitter performance can be improved.

US Patent:

7844253, Nov 30, 2010

Filed:

Oct 19, 2007

Appl. No.:

11/875803

Inventors:

Steven S. Chan - Fremont CA, US
George C. Huang - Los Altos Hills CA, US

Assignee:

Future Dial Inc. - Sunnyvale CA

International Classification:

H04M 1/66

US Classification:

455410, 455301, 4555755, 455106, 135139

Abstract:

A method and apparatus to use a shielded enclosure for exchanging secure data. One embodiment comprises an enclosure formed of electromagnetically shielding material that prevents an electromagnetic field from entering an interior of the enclosure or emitting from the interior of the enclosure, the enclosure sized to house a mobile electronic device; a receiver within an interior of the enclosure to receive data transferred wirelessly from a mobile electronic device placed within the enclosure; and a hardware interface having a first end external to the enclosure and a second end within the interior of the enclosure and coupled to the antenna, the hardware interface to transfer data wirelessly received by the receiver to a separate device exterior to the enclosure.

US Patent:

7880551, Feb 1, 2011

Filed:

Dec 29, 2006

Appl. No.:

12/159750

Inventors:

Steven Chan - Yonkers NY, US
Kenneth L. Shepard - Ossining NY, US
Zheng Xu - Staten Island NY, US

Assignee:

The Trustees of Columbia University in the City of New York - New York NY

International Classification:

G06F 1/00
H03B 5/00
H03B 5/18
H03L 5/00
H03L 7/00
H03L 7/099
H03L 7/24

US Classification:

331 55, 331 2, 331 96, 331117 D, 331179, 331183, 713500, 713503

Abstract:

Systems and methods for distributing a clock signal are disclosed. In some embodiments, systems for distributing a clock signal include a plurality of resonant oscillators, each comprising an inductor; and a differential clock grid that distributes the clock signal. The differential clock grid is coupled to the plurality of resonant oscillators and the clock signal, and the inductances of the inductors are configured such that a resonant frequency of the plurality of resonant oscillators is substantially equal to the frequency of the clock signal.

US Patent:

20020174436, Nov 21, 2002

Filed:

Dec 17, 2001

Appl. No.:

10/025849

Inventors:

George Wu - Oakland CA, US
Steven Chan - San Francisco CA, US
Ronald Tamura - Fremont CA, US
Elizabeth Shoemaker - Fostser City CA, US
Tze-Yee Szeto - Santa Cruz CA, US

International Classification:

H04N007/173

US Classification:

725/087000, 725/101000

Abstract:

A system for providing on demand responses to consumer impulses produced by a demand stimulus includes a computer processing system and content databases accessible by the computer-processing system having stored stimulus responses corresponding to a plurality of consumer demand stimuli in at least two categories of demand stimuli. A real-time inquiry response system associated with the computer processing system receives inquiries provided by a consumer and identifies the content category with which the consumer inquiry is associated. The computer processing system correlates consumer inquiries received by the real-time inquiry response system with stimulus responses stored in the content database based on the content category identified by the inquiry response system, so that the real-time consumer response system can return to the consumer, in real time, a stored stimulus response which correlates to the consumer inquiry. Categories of demand stimuli can include broadcast and non-broadcast information, and can include a variety of information categories or sub-categories such as music, advertisements, and scheduled events in respect to which a consumer may desire information or make a purchase.

US Patent:

20050020303, Jan 27, 2005

Filed:

May 12, 2004

Appl. No.:

10/844771

Inventors:

Steven Chan - Fremont CA, US

International Classification:

H04M001/00

US Classification:

455556100

Abstract:

A mobile communication device including an integrated stylus input unit to input data into the device, and an interface to wirelessly transmit data. In one embodiment, the integrated stylus is a handwriting stylus input device to input data by moving the stylus over a substantially flat surface. In one embodiment, the stylus includes a motion sensor embedded in an antenna extending from the device.

US Patent:

47376708, Apr 12, 1988

Filed:

Nov 9, 1984

Appl. No.:

6/670454

Inventors:

Steven S. Chan - Fremont CA

Assignee:

LSI Logic Corporation - Milpitas CA

International Classification:

H03K 513

US Classification:

307602

Abstract:

A circuit (40) constructed in accordance with this invention includes a ring oscillator (25) to provide a signal which is dependent on the propagation delays of the inverters (33, 34, 35) comprising the ring oscillator, therefore the frequency of the ring oscillator is inversely dependent upon the propagation delays of the inverter comprising the ring oscillator. Means (37) are provided to determine the propagation delay introduced by the components in the ring oscillator by measuring the frequency of the output signal produced by the ring oscillator which provides a signal to a multiplexer (36) which selects among a number of preset delay components (26) those components which are necessary to ensure that the propagation delay caused by the circuitry (not shown) connected to the input lead (21) of the circuit constructed in accordance with this invention plus the propagation delay introduced by the selectable delay elements is nearly a constant propagation delay.

US Patent:

49804081, Dec 25, 1990

Filed:

Oct 2, 1989

Appl. No.:

7/415672

Inventors:

Steven Y. Chan - Belleville NJ

Assignee:

BASF Corporation - Parsippany NJ

International Classification:

C09F 100
C09F 104
C08L 5100

US Classification:

524504

Abstract:

The invention relates to novel water-based surface and lamination printing ink compositions and to their use as surface printing inks for printing onto substrates and in particular for printing onto plastic substrates. The surface printing inks of the present invention are superior in printing aptitude and color strength.