Chen Chen

US Patent:

20130292186, Nov 7, 2013

Filed:

Mar 15, 2013

Appl. No.:

13/836603

Inventors:

MICHAEL G. AZAR - THE WOODLANDS TX, US
CHEN CHEN - THE WOODLANDS TX, US
YURI BURHAN - SPRING TX, US

Assignee:

SMITH INTERNATIONAL, INC. - HOUSTON TX

International Classification:

E21B 17/10

US Classification:

175408

Abstract:

A downhole cutting tool may include a tool body, a plurality of blades extending azimuthally from the tool body comprising a cone region, a shoulder region, and a gage region, at least one cutting element disposed along the cone region and the shoulder region of the blade, and at least one gage cutting element disposed along the gage region of the blade wherein the at least one gage cutting element has a negative backrake ranging from greater than 70 to about 85 degrees.

US Patent:

20130333953, Dec 19, 2013

Filed:

Mar 5, 2013

Appl. No.:

13/786085

Inventors:

SMITH INTERNATIONAL, INC. - , US
JIBIN SHI - SPRING TX, US
YURI BURHAN - SPRING TX, US
CHEN CHEN - THE WOODLANDS TX, US

Assignee:

SMITH INTERNATIONAL, INC. - HOUSTON TX

International Classification:

E21B 10/42

US Classification:

175428

Abstract:

A cutter assembly may include a sleeve; and at least one cutting element having a lower spindle portion retained in the sleeve and a portion of the cutting element interfacing an axial bearing surface of the sleeve, wherein an outer diameter D of the cutting element and a radial length T of a substantially planar portion of the axial bearing surface of the sleeve have the following relationship:

US Patent:

20140054094, Feb 27, 2014

Filed:

Aug 21, 2013

Appl. No.:

13/972465

Inventors:

Jibin Shi - Spring TX, US
Chen Chen - Houston TX, US
Youhe Zhang - Spring TX, US

Assignee:

Smith International, Inc. - Houston TX

International Classification:

E21B 10/50

US Classification:

175354

Abstract:

A cutting element is disclosed that includes a sleeve, a rotatable cutting element, and at least one retaining ring. The sleeve has a first inner diameter and a second inner diameter, wherein the second inner diameter is larger than the first inner diameter and located at a lower axial position than the first inner diameter. The rotatable cutting element has an axis of rotation extending therethrough, a cutting face, a body extending axially downward from the cutting face, wherein the body has a shaft that is disposed within the sleeve, and a circumferential groove formed around an outer surface of the shaft. The at least one retaining ring is disposed in the circumferential groove and extends at least around the entire circumference of the shaft, wherein the at least one retaining ring protrudes from the circumferential groove, thereby retaining the rotatable cutting element within the sleeve.

US Patent:

50128086, May 7, 1991

Filed:

Oct 17, 1988

Appl. No.:

7/258785

Inventors:

Ron Stubbers - Houston TX
Chen Chen - Houston TX
Malcolm Skolnick - Houston TX

Assignee:

Zion Educational Foundation - London

International Classification:

A61N 100

US Classification:

128419R

Abstract:

A pulse generation and tracking system for connection to an object or a subject under treatment therewith, the waveform being a train of repetitive complex pulses each pulse comprising a large amplitude, short duration positive polarity portion and a small amplitude, long duration negative polarity portion, and a zero value portion. The prescribed pulse train for a subject is delivered by a delivery device, which also provides monitoring of the averaged voltage amplitude of the positive portion in terms of either voltage or current value. The impedance of the subject is expected to change over time and cause the individual pulses to vary from predetermined limits. When this occurs, then a subsequent generation of pulses will be changed so that the pulses are again delivered within the predetermined value limits or boundary. Tracking and generation can be operationally crossed, if desired, so that a voltage out of boundary will cause the current of a subsequent pulse to be changed or vice versa.

US Patent:

47790440, Oct 18, 1988

Filed:

Sep 8, 1987

Appl. No.:

7/095009

Inventors:

Malcolm Skolnick - Houston TX
Ron Stubbers - Houston TX
Chris Hymel - Houston TX
Chen Chen - Houston TX

Assignee:

Zion Educational Foundation

International Classification:

G01R 2316

US Classification:

324 77R

Abstract:

A regularly repetitive, almost periodic but non-regularly shaped waveform is amplitude sampled at an interval different from that of the waveform under investigation. For a voltage measurement, the positive samples are averaged for a predetermined count number (one set) and the negative samples are likewise averaged. Zero value samples are ignored. The highest absolute value of the two is taken as a meaningful measurement. Alternatively, one of these values can be selected. For a current measurement, a running average for a predetermined number of sets can also be developed. Finally, frequency can be developed by sensing the transitions and operating a counter on/off at the beginning and ending of a waveform cycle. The count of regular interval counts is then multiplied by the interval time to give the period of the waveform. The reciprocal of the period is a measure of the frequency.

US Patent:

20200256587, Aug 13, 2020

Filed:

Apr 29, 2020

Appl. No.:

16/862289

Inventors:

Keith Lovegrove - O'Connor, AU
- Oakland CA, US
Richard Edward Wirz - Los Angeles CA, US
Hamarz Aryafar - Los Angeles CA, US
Chen Chen - Los Angeles CA, US

Assignee:

The Regents of the University of California - Oakland CA

International Classification:

F24S 60/00
F24S 23/74
F28D 20/00
F24S 20/20
F04B 45/04
B65G 5/00

Abstract:

A reservoir for containing a fluid includes a cylindrical wall sized to engage a shaft bored into ground, a bottom end cap fixed to a lower end of the cylindrical wall and a top end cap fixed to an upper end of the cylindrical wall. The top end cap is concave such that the top end cap extends below a top end of the cylindrical wall. The bottom end cap, the top end cap, and the cylindrical wall define a subterranean chamber. A plug made of a composite material is on the top end cap, with a lower face disposed on the concave top end cap and a peripheral face engaging the shaft. At least one pressure port extends downwardly into the shaft and through the plug and the top end cap, defining a fluid path to the subterranean chamber.

US Patent:

20180258708, Sep 13, 2018

Filed:

May 16, 2018

Appl. No.:

15/981225

Inventors:

- Houston TX, US
Jibin Shi - Spring TX, US
Chen Chen - New Haven CT, US
Youhe Zhang - Spring TX, US

International Classification:

E21B 10/567
E21B 10/42
E21B 10/62
E21B 10/627

Abstract:

A cutting element includes a sleeve, a rotatable cutting element, and at least one retaining ring. The sleeve has a first inner diameter and a second inner diameter, wherein the second inner diameter is larger than the first inner diameter and located at a lower axial position than the first inner diameter. The rotatable cutting element has an axis of rotation extending therethrough, a cutting face, a body extending axially downward from the cutting face, wherein the body has a shaft that is disposed within the sleeve, and a circumferential groove formed around an outer surface of the shaft. The at least one retaining ring is disposed in the circumferential groove and extends at least around the entire circumference of the shaft, wherein the at least one retaining ring protrudes from the circumferential groove, thereby retaining the rotatable cutting element within the sleeve.

US Patent:

20180180325, Jun 28, 2018

Filed:

Jun 27, 2016

Appl. No.:

15/739125

Inventors:

- Oakland CA, US
Richard Edward Wirz - Los Angeles CA, US
Hossein Pirouz Kavehpour - Los Angeles CA, US
Hamarz Aryafar - Los Angeles CA, US
Chen Chen - Los Angeles CA, US
Gopinath Warrier - Reseda CA, US
Dante Adam Simonetti - Redondo Beach CA, US
Keith Lovegrove - O'Connor, AU
Joshua Jordan - O'Connor, AU
Jonathon Kennedy - O'Connor, AU

Assignee:

The Regents of the University of California - Oakland CA

International Classification:

F28D 20/00
B65G 5/00

Abstract:

Thermochemical energy storage (TCES) for concentrating solar power (CSP) systems provides higher energy density than sensible energy storage systems. An ammonia-based TCES system dissociates endothermically into hydrogen and nitrogen. The stored energy is released when supercritical hydrogen and nitrogen react exothermically to synthesize ammonia. Prior ammonia synthesis systems are unable to produce temperatures consistent with modern power blocks requiring a working fluid, for example steam or carbon dioxide, to be heated to greater than 600 C., for example about 650 C. An ammonia synthesis system heats steam from, for example 350 C. to 650 C. under pressure of about 26 MPa. The hydrogen and nitrogen are preheated with a flow of supercritical fluid prior to the synthesis step to provide reaction rates sufficient to heat power block working fluid to the desired temperature.