Chun C Wang

US Patent:

7639181, Dec 29, 2009

Filed:

Dec 29, 2006

Appl. No.:

11/618131

Inventors:

Chun Wang - San Mateo CA, US
Shaowei Han - Palo Alto CA, US

Assignee:

SiRF Technology Holdings, Inc. - San Jose CA

International Classification:

H01S 1/00

US Classification:

34235712

Abstract:

A Global Navigation Satellite System (GNSS) receiver and associated method capable of tracking weak GNSS signals from a plurality of GNSS satellites. In a preferred embodiment, code and carrier tracking loops are initially closed around the code phase, carrier frequency, and data bit edge estimates handed over from an acquisition mode. In subsequent tracking, early, prompt, and late copies of the code replica are correlated with the incoming signal. The prompt correlations are coherently integrated over an extended updating interval for data bit edge and sign estimation as well as for carrier phase and frequency error discrimination whereas the early and late correlations are used for code error discrimination. Code delay and carrier phase and frequency errors are used to update the code and carrier tracking loop filters. Together with data bits, they form observables of a GNSS signal's time and frequency parameters for timing and position fixing.

US Patent:

20110003175, Jan 6, 2011

Filed:

Jan 7, 2010

Appl. No.:

12/684070

Inventors:

Bogdan Florin Valcu - Fremont CA, US
Qixu Chen - Milpitas CA, US
Connie Chunling Liu - San Jose CA, US
Chun Wang - Fremont CA, US
Shoutao Wang - Fremont CA, US

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 5/33
G11B 5/84

US Classification:

428800, 427127

Abstract:

A perpendicular magnetic recording layer may include a hard granular layer, an exchange break layer formed on the hard granular layer, and a soft granular layer formed on the exchange break layer. In some embodiments, the exchange break layer may consist essentially of ruthenium. In some embodiments, the perpendicular magnetic recording layer may include n magnetic layers and n−1 exchange break layers, where n is greater than or equal to three, and where the n−1 exchange break layers alternate with the n magnetic layers in the magnetic recording layer.

US Patent:

20120135274, May 31, 2012

Filed:

Nov 30, 2010

Appl. No.:

12/957372

Inventors:

CHUN WANG - Fremont CA, US
Connie Liu - San Jose CA, US
Xiaoding Ma - Fremont CA, US
Li Tang - Fremont CA, US

International Classification:

G11B 5/66
B05D 5/12

US Classification:

4288281, 427131, 428800, 428827

Abstract:

A magnetic film or layer includes a non-hexagonal close pack (non-hcp) structure.

US Patent:

46847014, Aug 4, 1987

Filed:

Sep 24, 1986

Appl. No.:

6/911197

Inventors:

Chun S. Wang - Lake Jackson TX
Robert L. Bowden - Angleton TX
Wuu N. Chen - Lake Jackson TX

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08G 5914

US Classification:

525507

Abstract:

Advanced epoxy resins having a low total aliphatic halide content are prepared by reacting an epoxy resin having an average of more than one 1,2-epoxide group per molecule with a material having an average of more than one phenolic hydroxyl group per molecule in the presence of a solvent having at least one aliphatic hydroxide group per molecule and a catalytic quantity of an alkali metal hydroxide. These low aliphatic halide-containing advanced epoxy resins are useful in formulations for preparing laminates, moldings, pottings and coatings for the electronics industry.

US Patent:

50286684, Jul 2, 1991

Filed:

Jul 6, 1990

Appl. No.:

7/549177

Inventors:

Chun S. Wang - Lake Jackson TX
Abel Mendoza - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08G 5914

US Classification:

525481

Abstract:

Adducts of metabrominated monophenols such as 3,5-dibromo-2,4,6-trimethylphenol and multifunctional epoxides such as cresol-formaldehyde epoxy novolac resins are disclosed to be useful in formulations for encapsulating electronic components.

US Patent:

47788631, Oct 18, 1988

Filed:

Aug 13, 1987

Appl. No.:

7/085035

Inventors:

Chun S. Wang - Lake Jackson TX

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08G 5906
C08G 5908
C07D30127

US Classification:

525507

Abstract:

Glycidyl derivatives of compounds containing --OH, --NH. sub. 2 and/or --COOH groups are prepared by reacting in the presence of a mixture of solvents, at least one of which is a polar aprotic solvent, an excess of an epihalohydrin with a compound containing --OH, --NH. sub. 2 and/or --COOH groups while continuously or incrementally adding an alkali metal hydroxide to the mixture and removing water from the reaction by codistillation with epihalohydrin and the solvents.

US Patent:

53916050, Feb 21, 1995

Filed:

Sep 14, 1993

Appl. No.:

8/121085

Inventors:

Todd Andres - Houston TX
Eduardo Alvarez - Houston TX
O. Richard Hughes - Chatham NJ
William Cooper - Clinton NJ
Chun Wang - Missouri City TX

Assignee:

Hoechst Celanese Corp. - Somerville NJ

International Classification:

C08J 510
C08K 338
C08L 7908

US Classification:

524404

Abstract:

A polymeric composition containing internal lubricants is suitable for low friction applications. The composition contains from about 65 to about 85 weight percent of a polymeric blend and from about 15 to about 35 weight percent of internal lubricants, wherein said blend consists essentially of from about 35 to about 100 weight percent of polybenzimidazole and from about 0 to about 65 weight percent of poly(aryletherketone), and said lubricants consist essentially of graphite and boron nitride in a weight ratio of about 1:10 to about 10:1, respectively. The composition is useful for preparing shaped articles such as bearings, bearing sleeves, rings, etc.

US Patent:

44992556, Feb 12, 1985

Filed:

Aug 16, 1983

Appl. No.:

6/523910

Inventors:

Chun S. Wang - Lake Jackson TX
Ha Q. Pham - Richwood TX
James L. Bertram - Lake Jackson TX

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08G 5906
C08G 5910

US Classification:

528 95

Abstract:

Epoxy resins are prepared by reacting an excess of an epihalohydrin with a phenolic hydroxyl-containing compound in the presence of the incremental addition of a basic catalyst while removing water by codistilling with a solvent and epihalohydrin.