Yu C Liu

US Patent:

6465692, Oct 15, 2002

Filed:

Dec 22, 1999

Appl. No.:

09/469675

Inventors:

M. Parameswara Reddy - Brea CA
Chitra K. Ratnayake - Yorba Linda CA
Yu Liu - Rowland Heights CA
Jirong Gu - Irvine CA

Assignee:

Beckman Coulter, Inc. - Fullerton CA

International Classification:

C07C23303

US Classification:

564215, 564216, 514629, 204451

Abstract:

Formamide with low conductivity and a neutral or slightly basic pH is provided. Such formamide may be used in a sample loading solution for capillary electrophoretic separation of biomolecular analytes to enhance the efficiency of sample injection into the capillary and the intensity of the signal. Formamide of the present invention may be obtained by first purifying the formamide to a conductivity of below 7 micro mho, and then adjusting the pH of the purified formamide with a base to a range of about pH 6. 5 to 7. 5. The purification may be carried out by first removing the water from the formamide, and then distilling the dried formamide until the conductivity of formamide is below about 7 micro mho.

US Patent:

7381317, Jun 3, 2008

Filed:

Jun 27, 2003

Appl. No.:

10/607584

Inventors:

Yu Liu - Diamond Bar CA, US
M. Parameswara Reddy - Brea CA, US
Chitra K. Ratnayake - Yorba Linda CA, US
Edward V. Koh - Diamond Bar CA, US

Assignee:

Beckman Coulter, Inc. - Fullerton CA

International Classification:

G01N 27/453

US Classification:

204605, 204455

Abstract:

This invention relates to improved methods and compositions for conducting Capillary Electrophoresis (CE) to separate molecules on the basis of their respective size or charge.

US Patent:

7639609, Dec 29, 2009

Filed:

Jul 15, 2007

Appl. No.:

11/778053

Inventors:

Gordon Bolt - Apex NC, US
Edward A. Sykes - Cary NC, US
Yu Liu - San Jose CA, US

Assignee:

OPNET Technologies, Inc. - Bethesda MD

International Classification:

H04L 12/26
G06F 15/177

US Classification:

370229, 370237, 370250, 370252, 709220, 709223

Abstract:

An existing network configuration is assessed, and potential changes to the existing configuration are identified that provide the greatest incremental improvements to the performance of the network. In a preferred embodiment, the user of the system identifies the maximum number (N) of changes that may be implemented in an existing network, and the system provides a set of possible reconfigurations, each requiring fewer than N changes. The user is presented a display of the potential improvement provided by each set as a function of the number of changes in the set, so that the relative incremental gain can be easily visualized. The objective function of the optimization may include conventional load-balancing objectives, or other objectives, such as a global minimization of path lengths.

US Patent:

7742177, Jun 22, 2010

Filed:

Jan 22, 2008

Appl. No.:

12/018028

Inventors:

Shifang Li - Pleasanton CA, US
Yu Liu - Sunnyvale CA, US

Assignee:

Tokyo Electron Limited - Tokyo

International Classification:

G01B 11/14

US Classification:

356625

Abstract:

The invention can provide apparatus and methods for processing wafers using Noise-Reduction (N-R) metrology models that can be used in Double-Patterning (D-P) processing sequences, Double-Exposure (D-E) processing sequences, or other processing sequences.

US Patent:

7889641, Feb 15, 2011

Filed:

Jul 18, 2007

Appl. No.:

11/779429

Inventors:

Yu Liu - San Jose CA, US
Gordon Bolt - Apex NC, US
Edward Sykes - Cary NC, US

Assignee:

Opnet Technologies, Inc. - Bethesda MD

International Classification:

G06F 11/00

US Classification:

370228

Abstract:

A path-flow formulation of defining MPLS FRR bypass LSPs is presented. The path-flow formulation comprises first identifying a set of candidate bypass LSPs, each of which meets various network constraints and has an explicit route around a network facility to be protected. The constraints may include Quality of Service (QoS) guarantees, implementation requirements, network element resource limitations, and resiliency requirements. The constraints may be user-selected, and may be non-linear. The set of candidate bypass LSPs form a linear programming (LP) problem, or an integer linear programming (ILP) problem if the allowable number of bypass LSPs is constrained. In an optimization step, LP solutions are used to select the bypass LSPs from among the candidate bypass LSPs by allocating bandwidth to them.

US Patent:

8509577, Aug 13, 2013

Filed:

Jul 2, 2010

Appl. No.:

12/829787

Inventors:

Yu Liu - Irvine CA, US

Assignee:

St. Jude Medical, Inc. - St Paul MN

International Classification:

G02B 6/26

US Classification:

385 27, 385 33, 385 34, 385 39

Abstract:

Embodiments of the invention provide a fiberoptic device that uses a gradient-index (GRIN) lens for focusing a light beam emitted by an optical fiber, but achieves a substantially longer focal length than that of a GRIN lens alone by placing a beam expander (e. g. , no core fiber or step-index multimode fiber) between the terminal end of the optical fiber and the GRIN lens to simulate free space therebetween. In one embodiment, a fiberoptic device comprises an optical fiber having a fiber core and an end through which a light beam emits from the fiber core; a beam expander having a first end coupled to the end of the optical fiber and having a second end, the beam expander permitting the light beam emitting from the fiber core to pass from the first end to the second end and to expand from the first end to a larger size at the second end; and a gradient-index fiber lens coupled to the second end of the beam expander to receive the light beam from the beam expander and focus the light beam.

US Patent:

20090314638, Dec 24, 2009

Filed:

May 12, 2008

Appl. No.:

12/119363

Inventors:

Yu Liu - Diamond Bar CA, US
M. Parameswara Reddy - Brea CA, US
Chitra K. Ratnayake - Yorba Linda CA, US
Edward V. Koh - Diamond Bar CA, US

Assignee:

Beckman Coulter, Inc. - Fullerton CA

International Classification:

B01D 57/02
C07K 1/26

US Classification:

204455, 204605

Abstract:

This invention relates to improved methods and compositions for conducting Capillary Electrophoresis (CE) to separate molecules on the basis of their respective size or charge.

US Patent:

20100041986, Feb 18, 2010

Filed:

Jul 23, 2009

Appl. No.:

12/508000

Inventors:

Tho Hoang NGUYEN - Huntington Beach CA, US
Peter C. CHEN - Irvine CA, US
Alan DE LA RAMA - Cerritos CA, US
Yu LIU - Irvine CA, US

International Classification:

A61B 6/02
A61B 18/14

US Classification:

600427, 606 33

Abstract:

An ablation and monitoring system comprises a catheter, an optical coherence tomography (OCT) system, and an ablation generator. The catheter comprises one or more optical fibers to transmit a light beam to a tissue material and collect a reflected light from the tissue material. The OCT system is in optical communication with the catheter via the one or more optical fibers, providing the light beam to the one or more optical fibers and receiving the reflected light from the one or more optical fibers. The ablation generator is in electrical communication with the OCT system and with the catheter. The ablation generator provides radio frequency energy to the catheter for ablating the tissue material, monitors and assesses the ablation based on an information signal received from the OCT system.