CHEN CHEN, MD
Medical Practice at Medical Center Blvd, Conroe, TX

2014005, Feb 27, 2014

Aug 21, 2013

13/972465

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

Smith International, Inc. - Houston TX

E21B 10/50

175354

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.

4779044, Oct 18, 1988

Sep 8, 1987

7/095009

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

Zion Educational Foundation

G01R 2316

324 77R

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.

5012808, May 7, 1991

Oct 17, 1988

7/258785

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

Zion Educational Foundation - London

A61N 100

128419R

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.