Chen Hung Chen

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:

20140174834, Jun 26, 2014

Filed:

Dec 23, 2013

Appl. No.:

14/138894

Inventors:

- Houston TX, US
Chen Chen - Houston TX, US
Yuri Burhan - Spring TX, US
Jibin Shi - Spring TX, US

Assignee:

SMITH INTERNATIONAL, INC. - Houston TX

International Classification:

E21B 10/573
E21B 10/55

US Classification:

175432

Abstract:

A cutting element assembly includes a sleeve, a lining extending a distance axially from an end of the sleeve, and an inner cutter. The inner cutter has a cutting end, wherein the cutting end extends a depth from a cutting face, a side surface, and a body, wherein the body is at least partially disposed within the sleeve, and wherein the side surface of the cutting end interfaces with an interfacing surface of the lining.