Yi Chen

US Patent:

6650895, Nov 18, 2003

Filed:

Nov 23, 1999

Appl. No.:

09/447696

Inventors:

Channasandra Ravishankar - Germantown MD
David Roos - Boyds MD
Anthony Noerpel - Lovettsville VA
Chandra Joshi - Gaithersburg MD
James Hobza - Carlsbad CA
Prabir Datta - New Delhi, IN
Yi Chen - Gaithersburg MD

Assignee:

Hughes Electronics Corporation - El Segundo CA

International Classification:

H04Q 720

US Classification:

4554221, 455560, 455564, 455427

Abstract:

A system and a methodology to improve the end-user quality of service both in terms of response time and reliability for the transport of in-call DTMF signals in wireless systems, particularly in geostationary mobile satellite systems. The methodology encompasses several techniques to provide acceptable end-to-end quality of service for DTMF. A technique is applicable for transport of DTMF in the wireless subscriber to network direction, where DTMF digits are carried in the form of an out-band message. The central part of the technique is to allow multiple key presses in the same message, thereby increasing efficiency and throughput in long-delay environment. Another technique utilizes the vocoders functionality to carry DTMF in-band, thereby reducing system complexity. The scheme makes the use of an integrated DTMF detector which can classify a given frame of signal into several classes so that the DTMF encoded packet can carry a unique pattern across the air-interface to the voice decoder at AT, which is capable of identifying the pattern. Another technique pertains to the use of a message based DTMF transport between two-ATs on a separate logical channel with a unique Service Access point Identifier (SAPI) providing guaranteed service for DTMF transport in an AT-AT call.

US Patent:

8337950, Dec 25, 2012

Filed:

May 24, 2010

Appl. No.:

12/786245

Inventors:

Victor Nguyen - Novato CA, US
Yi Chen - Sunnyvale CA, US
Mihaela Balseanu - Sunnyvale CA, US
Isabelita Roflox - Union City CA, US
Li-Qun Xia - Cupertino CA, US
Derek R Witty - Fremont CA, US

Assignee:

Applied Materials, Inc. - Santa Clara CA

International Classification:

C23C 16/38
C23C 16/30

US Classification:

4272495, 42725538, 427255394, 4272557

Abstract:

Methods for processing a substrate with a boron rich film are provided. A patterned layer of boron rich material is deposited on a substrate and can be used as an etch stop. By varying the chemical composition, the selectivity and etch rate of the boron rich material can be optimized for different etch chemistries. The boron rich materials can be deposited over a layer stack substrate in multiple layers and etched in a pattern. The exposed layer stack can then be etched with multiple etch chemistries. Each of the boron rich layers can have a different chemical composition that is optimized for the multiple etch chemistries.

US Patent:

20170204444, Jul 20, 2017

Filed:

Feb 5, 2016

Appl. No.:

15/017365

Inventors:

- Oakland CA, US
Hai Yu - Woodland CA, US
Yanhong Li - Davis CA, US
Yi Chen - Davis CA, US
Jingyao Qu - Smyrna GA, US
Musleh M. Muthana - Davis CA, US
Kam Lau - Parkwood, AU
Lars Bode - San Diego CA, US

Assignee:

The Regents of the University of California - Oakland CA

International Classification:

C12P 19/30
C12P 19/18
C12P 19/04
C12P 19/12

Abstract:

The present invention provides a one-pot multi-enzyme method for preparing UDP-sugars from simple sugar starting materials. The invention also provides a one-pot multi-enzyme method for preparing oligosaccharides from simple sugar starting materials.

US Patent:

20140235575, Aug 21, 2014

Filed:

Jan 21, 2014

Appl. No.:

14/160451

Inventors:

- Oakland CA, US
Hai Yu - Woodland CA, US
Yanhong Li - Davis CA, US
Yi Chen - Davis CA, US
Jingyao Qu - Smyma GA, US
Musleh M. Muthana - Davis CA, US
Kam Lau - Parkwood, AU
Lars Bode - San Diego CA, US

Assignee:

THE REGENTS OF THE UNIVERSITY OF CALIFORNIA - Oakland CA

International Classification:

C07H 5/06
C12P 19/26

US Classification:

514 61, 536 53, 514 54, 435 84

Abstract:

The present invention provides a one-pot multi-enzyme method for preparing UDP-sugars from simple sugar starting materials. The invention also provides a one-pot multi-enzyme method for preparing oligosaccharides from simple sugar starting materials.