Jian 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:

20220212932, Jul 7, 2022

Filed:

Mar 23, 2022

Appl. No.:

17/701815

Inventors:

- St. Louis MO, US
Peng Fan - St. Louis MO, US
Justin Robert Struble - Ballwin MO, US
Jian Xu - Wildwood MO, US

Assignee:

Monsanto Technology LLC - St. Louis MO

International Classification:

C01B 25/12

Abstract:

The present invention is generally directed to improved processes for the preparation of various phosphorus oxides and phosphoric acid. Phosphorus oxides prepared in accordance with the present invention include phosphorus (III) oxides (e.g., tetraphosphorus hexaoxide (PO)). Phosphorus (III) oxides such as POare useful products and are also useful as precursors in preparation of other products, including phosphorous acid (HPO) and other phosphorus-containing chemicals. Certain aspects of this invention are also directed to using various byproducts formed during POproduction as precursors for the formation of phosphoric acid (HPO) and PO. In particular, the present invention is directed to improved processes for the preparation of phosphorus (III) oxides (e.g., PO) suitable for use in the preparation of phospho-herbicides such N-(phosphonomethyl)glycine (glyphosate) and precursors thereof (e.g., N-(phosphonomethyl)iminodiacetic acid (PMIDA)). The present invention is thus further directed to preparation of these compounds.

US Patent:

20200156944, May 21, 2020

Filed:

Nov 19, 2019

Appl. No.:

16/688159

Inventors:

- St. Louis MO, US
Peng Fan - St. Louis MO, US
Justin Robert Struble - Ballwin MO, US
Jian Xu - Wildwood MO, US

Assignee:

Monsanto Technology LLC - St. Louis MO

International Classification:

C01B 25/12

Abstract:

The present invention is generally directed to improved processes for the preparation of various phosphorus oxides and phosphoric acid. Phosphorus oxides prepared in accordance with the present invention include phosphorus (III) oxides (e.g., tetraphosphorus hexaoxide (PO)). Phosphorus (III) oxides such as POare useful products and are also useful as precursors in preparation of other products, including phosphorous acid (HPO) and other phosphorus-containing chemicals. Certain aspects of this invention are also directed to using various byproducts formed during POproduction as precursors for the formation of phosphoric acid (HPO) and PO. In particular, the present invention is directed to improved processes for the preparation of phosphorus (III) oxides (e.g., PO) suitable for use in the preparation of phospho-herbicides such N-(phosphonomethyl)glycine (glyphosate) and precursors thereof (e.g., N-(phosphonomethyl)iminodiacetic acid (PMIDA)). The present invention is thus further directed to preparation of these compounds.