Joseph F Pang

US Patent:

20060039359, Feb 23, 2006

Filed:

Aug 17, 2005

Appl. No.:

11/207111

Inventors:

Joseph Pang - Los Altos CA, US

International Classification:

H04L 12/66

US Classification:

370352000

Abstract:

A managed mobile voice over internet protocol (VoIP) overlay network for use by public carriers for managing the connectivity and transport of media over the Internet is disclosed in accordance with an embodiment and method of the present invention.

US Patent:

52231143, Jun 29, 1993

Filed:

Aug 8, 1991

Appl. No.:

7/744642

Inventors:

Richard N. Zare - Stanford CA
Xiao-Hua Huang - Atherton CA
Joseph Pang - Palo Alto CA

Assignee:

Board of Trustees of the Leland Stanford Junior University - Stanford CA

International Classification:

G01N 2726
G01N 27447

US Classification:

204299R

Abstract:

An on-column conductivity detector for microcolumn electrokinetic separation systems is disclosed. The detector is based on the column itself, the column having a largest internal cross-sectional dimension of 500 microns or less and includes one or more sensing electrodes positioned directly upon or immediately adjacent to (i. e. contiguous with) the wall of the column into communication with the analyte stream so as to present no dead volume and no increase in cross-sectional area to the fluid flow. In one embodiment, this conductivity detector has a single on-column electrode, located immediately adjacent to the exit end of the column. In a preferred embodiment, this conductivity detector has one or more pairs of on-column sensing electrodes and these paired electrodes are located directly across from each other on the microcolumn, to minimize potential across the electrodes and concomitant electrochemical reactions.