John Hanchang Chen

US Patent:

7346700, Mar 18, 2008

Filed:

Apr 7, 2003

Appl. No.:

10/408273

Inventors:

Kenneth Gould - Oakton VA, US
John Anthony Chen - Ashburn VA, US

Assignee:

Time Warner Cable, a division of Time Warner Entertainment Company, L.P. - Stamford CT

International Classification:

G06F 15/16
G06F 15/173

US Classification:

709232, 709235, 709225

Abstract:

A system and method for managing e-mail traffic originating from a specific IP address. An outbound e-mail message is routed to an e-mail governor where the IP address of the computer from which outbound e-mail message originated is determined. A record associated with the originating IP address is created in a datatstore. Metrics useful to determine an e-mail message rate and an e-mail byte rate are stored in the e-mail record. An e-mail message rate is determined and compared with an e-mail message rate threshold. If the e-mail message rate threshold is exceeded, the originating IP address is sending spam e-mail (spam) and redial action is taken. An e-mail byte rate is also determined and compared with an e-mail byte rate threshold. If the e-mail byte rate threshold is exceeded, the originating IP address is using excess network resources to send e-mail and redial action is taken.

US Patent:

7372809, May 13, 2008

Filed:

May 18, 2004

Appl. No.:

10/848397

Inventors:

John Anthony Chen - Ashburn VA, US
Kenneth Gould - Oakton VA, US

Assignee:

Time Warner Cable, Inc. - Stamford CT

International Classification:

H04J 1/16

US Classification:

370229, 370389, 370401, 370392

Abstract:

Methods and systems for thwarting denial of service attacks originating in a DOCSIS-compliant cable network (DCN) are described. A DCN comprises one or more sub-networks each comprising an access network, one or more cable modem termination systems (CMTSs) and one or more cable modems (CMs). The DCN also accesses an edge server and a local DNS cache server. The DCN interfaces with the Internet and accesses a remote DNS server according to well-known protocols. The CMTS is adapted to compare the source IP address included in IP packet headers to the IP address of the customer premises equipment (CPE) from which the IP packet originates as assigned by the DNS. Data packets that have spoofed addresses are either deleted or quarantined. Packets reaching the edge server are evaluated by an attack detection system. A packet determined to be part of a denial of service attack is inspected and the source IP address and the destination IP address extracted.

US Patent:

7408092, Aug 5, 2008

Filed:

Nov 12, 2004

Appl. No.:

10/988136

Inventors:

Bryan K. Glover - Algonquin IL, US
John Q. Chen - Glenview IL, US
Peter R. Pujado - Kildeer IL, US
Bipin V. Vora - Naperville IL, US

Assignee:

UOP LLC - Des Plaines IL

International Classification:

C07C 1/00

US Classification:

585640

Abstract:

The average propylene cycle selectivity of an oxygenate to propylene (OTP) process using a dual-function oxygenate conversion catalyst is substantially enhanced by the use of a combination of: 1) moving bed reactor technology in the hydrocarbon synthesis portion of the OTP flow scheme in lieu of the fixed bed technology of the prior art; 2) a hydrothermally stabilized and dual-functional catalyst system comprising a molecular sieve having dual-function capability dispersed in a phosphorus-modified alumina matrix containing labile phosphorus and/or aluminum anions; and 3) a catalyst on-stream cycle time of 400 hours or less. These provisions stabilize the catalyst against hydrothermal deactivation and hold the build-up of coke deposits on the catalyst to a level which does not substantially degrade dual-function catalyst activity, oxygenate conversion and propylene selectivity, thereby enabling maintenance of average propylene cycle yield near or at essentially start-of-cycle levels.

US Patent:

7432406, Oct 7, 2008

Filed:

Jun 10, 2004

Appl. No.:

10/865271

Inventors:

John Q. Chen - Glenview IL, US
Jaime G. Moscoso - Mount Prospect IL, US
Jeffery C. Bricker - Buffalo Grove IL, US
Michelle J. Cohn - Glenview IL, US

Assignee:

UOP LLC - Des Plaines IL

International Classification:

C07C 5/327

US Classification:

585654, 585660

Abstract:

A dehydrogenation process using an improved noble metal containing catalyst is disclosed. The catalyst comprises a non-acidic molecular sieve having a three-dimensional microporous framework structure of tin, aluminum and silicon tetrahedral oxide units. The non-acidic molecular sieve has a noble metal such as platinum dispersed thereon. The molecular sieve is rendered non-acidic by treating it with an alkali or alkaline earth metal. At least 10% of the tin is in a reduced oxidation state.

US Patent:

7547812, Jun 16, 2009

Filed:

Jun 30, 2005

Appl. No.:

11/171801

Inventors:

Wharton Sinkler - Des Plaines IL, US
Robert W. Broach - Deerfield IL, US
Natasha Erdman - Somerville MA, US
Thomas M. Reynolds - Mobile AL, US
John Q. Chen - Glenview IL, US
Stephen T. Wilson - Libertyville IL, US
Paul T. Barger - Arlington Heights IL, US

Assignee:

UOP LLC - Des Plaines IL

International Classification:

C07C 1/00
B01J 27/182

US Classification:

585640, 502208, 502214, 502263, 423709

Abstract:

A catalyst for converting methanol to light olefins and the process for making and using the catalyst are disclosed and claimed. SAPO-34 is a specific catalyst that benefits from its preparation in accordance with this invention. A seed material is used in making the catalyst that has a higher content of the EL metal than is found in the principal part of the catalyst. The molecular sieve has predominantly a roughly rectangular parallelepiped morphology crystal structure with a lower fault density and a better selectivity for light olefins.

US Patent:

7550403, Jun 23, 2009

Filed:

Jun 30, 2005

Appl. No.:

11/171886

Inventors:

John Q. Chen - Des Plaines IL, US

Assignee:

UOP LLC - Des Plaines IL

International Classification:

B01J 38/06
B01J 38/48
B01J 38/66

US Classification:

502 22, 502 20, 502 26, 502 34, 502 54, 502 55

Abstract:

The invention is directed to a method of rejuvenating silicoaluminophosphate molecular sieve catalyst that has been deactivated hydrothermally as well as a method of using the rejuvenated catalyst to make an olefin product from an oxygenate feed. In particular, the invention is directed to rejuvenating the catalyst by contacting it with warm water, ammonium salts, dilute acids or low pressure steam until the catalytic activity level of the catalyst has been increased to the desired extent.

US Patent:

7550641, Jun 23, 2009

Filed:

May 20, 2008

Appl. No.:

12/123545

Inventors:

John Q. Chen - Glenview IL, US

Assignee:

UOP LLC - Des Plaines IL

International Classification:

B01J 38/06
B01J 38/48
B01J 38/66
C07C 1/00

US Classification:

585640, 502 20, 502 22, 502 26, 502 34, 502 27, 502 54, 502 55

Abstract:

The invention is directed to a method of rejuvenating silicoaluminophosphate molecular sieve catalyst that has been deactivated hydrothermally as well as a method of using the rejuvenated catalyst to make an olefin product from an oxygenate feed. In particular, the invention is directed to rejuvenating the catalyst by contacting it with warm water, ammonium salts, dilute acids or low pressure steam until the catalytic activity level of the catalyst has been increased to the desired extent.

US Patent:

7763766, Jul 27, 2010

Filed:

Dec 22, 2005

Appl. No.:

11/315933

Inventors:

Andrea G. Bozzano - Northbrook IL, US
Steven A. Bradley - Arlington Heights IL, US
Ricardo L. Castillo - Arlington Heights IL, US
John Q. Chen - Glenview IL, US

Assignee:

UOP LLC - Des Plaines IL

International Classification:

C07C 1/00
C10G 75/04
C10G 9/16

US Classification:

585640, 585639, 208 48 AA, 208 48 R

Abstract:

A process for producing light olefins from oxygenates wherein internal reactor are protected from metal-catalyzed coking preferably by employing a protective layer.