Jian Hua Xu

US Patent:

6683513, Jan 27, 2004

Filed:

Oct 24, 2001

Appl. No.:

10/000471

Inventors:

Khosro Shamsaifar - Ellicott City MD
Jian Xu - Clarksville MD

Assignee:

Paratek Microwave, Inc. - Columbia MD

International Classification:

H01P 1213

US Classification:

333135, 333209

Abstract:

A diplexer includes a first tunable bandpass filter connected to a first port, a second tunable bandpass filter connected to a second port, and a coupling element for coupling the first bandpass filter and the second bandpass filter to a third port. Each of the tunable bandpass filters includes a tunable capacitor, wherein a control signal applied to the tunable capacitor controls the transmission characteristic of the filter. The tunable capacitor can be a tunable dielectric varactor or a microelectromechanical variable capacitor. The coupling element can include one of: a circulator, a T-junction, and an orthomode transducer. Each of the first and second filters can comprise a fin line filter including a plurality of tunable dielectric capacitors mounted within a waveguide for controlling the filter transmission characteristics. Fixed bandpass filters can be inserted between each of the tunable bandpass filters and the coupling element.

US Patent:

7437464, Oct 14, 2008

Filed:

Jan 31, 2003

Appl. No.:

10/355264

Inventors:

Jian Xu - Herndon VA, US
Chung-Wen Yuan - North Potomac MD, US

Assignee:

Federal Home Loan Mortgage Corporation - McLean VA

International Classification:

G06F 15/16

US Classification:

709227, 709228, 709229

Abstract:

Systems and methods are provided for providing asynchronous communication between a source processor and a destination processor. In one embodiment, a method includes receiving an information request; making a first call to the destination processor, such that the first call includes the information request; and ending the first call while the destination processor determines an information response, such that said ending terminates a synchronous communication between the source processor and the destination processor. Furthermore, the method includes making a second call to the source processor, such that the second call includes the information response; ending the second call, such that said ending terminates a synchronous communication between the destination processor and the source processor; and providing asynchronously the information response.

US Patent:

6073017, Jun 6, 2000

Filed:

May 29, 1997

Appl. No.:

8/864927

Inventors:

Jian Ming Xu - Plano TX
Patrick N. Sollee - Richardson TX
Adam E. T. Bryant - Oxfordshire, GB

Assignee:

Nortel Networks Corporation - Montreal

International Classification:

H04Q 720

US Classification:

455435

Abstract:

A system and method for increasing capacity of a cellular system by reducing call overhead processing and transmission congestion previously required in updating a subscriber's mobile station data position as the subscriber moves among locations within a geographic area served by a network service provider is presented. A predetermined N number of copies of mobile station subscriber data is distributed among multiple Visiting Location Registers (VLRs) within the area served by a cellular system. Unlike previous systems, when mobile stations traverse location boundaries, the current VLR corresponding to the current location does not need to update the subscriber data if that data has not changed since the subscriber was last in that location.

US Patent:

60919523, Jul 18, 2000

Filed:

May 29, 1997

Appl. No.:

8/864926

Inventors:

Jian Ming Xu - Plano TX
Patrick N. Sollee - Richardson TX
Adam E. T. Bryant - Benson, GB

Assignee:

Nortel Networks Corporation - Montreal

International Classification:

H04Q 720

US Classification:

455433

Abstract:

A system and method for increasing capacity of a cellular system by reducing call overhead processing and transmission congestion previously required in updating a subscriber's mobile station data position as the subscriber moves among locations within a geographic area served by a network service provider is presented. A predetermined N number of copies of mobile station subscriber data is distributed among multiple Visiting Location Registers (VLRs) within the area served by a cellular system. Unlike previous systems, when mobile stations traverse location boundaries, the current VLR corresponding to the current location does not need to update the subscriber data if that data has not changed since the subscriber was last in that location.

US Patent:

20190062736, Feb 28, 2019

Filed:

Aug 22, 2018

Appl. No.:

16/108307

Inventors:

- Austin TX, US
Jian Xu - Plano TX, US

International Classification:

C12N 15/11
C12N 15/113

Abstract:

The present invention includes a method for detecting or isolating one or more specific genomic target regions and molecules interacting therewith comprising: contacting a recombinant nuclease-deficient Cas9 fusion protein (dCas9) modified to comprise a biotinylation sequence and one or more sequence-specific guide RNAs, with one or more specific genomic DNA targets in cells to form a CRISPR complex; and detecting or isolating the CRISPR complex with a streptavidin or an avidin to detect or isolate the one or more specific genomic target regions and molecules in the CRISPR complex.

Address:

6096 Rock Gln Dr, Elkridge, MD 21075

VIN:

2HNYD28267H525735

Make:

ACURA

Model:

MDX

Year:

2007