Search

Bradford B Chew

from San Ramon, CA
Age ~69
Get Report
Also known as:
Bradford Susan Chew, Brad B Chew, Bradford W
Phone and address:
805 Spring Brook Dr, San Ramon, CA 94582
(925) 829-3369
Related to:
Steven Chew, 31Samantha Chew, 26Thomas Easton, 95Thomas Easton
Connected to:
Aaron K Chew, 54Adrian P Chew, 52Allan B Chew, 98Benjamin M Chew, 60Bill M Chew, 56Brandon E Chew, 46Brittney C Chew, 36Brooke A Chew, 33Carmen Chew, 31Celestine Chew, 76

Bradford Chew Phones & Addresses

  • 805 Spring Brook Dr, San Ramon, CA 94582 (925) 829-3369
  • Dublin, CA
  • San Lorenzo, CA
  • Oakland, CA
  • Mountain View, CA

Work

Position: Food Preparation and Serving Related Occupations

Education

Degree: High school graduate or higher

Professional Records

Medicine Doctors

Bradford Chew Photo 1

Bradford James Chew

View page
Specialties:
Emergency Medicine
General Practice
Education:
University of California at Los Angeles (1985)

Business Records

Name / Title
Company / Classification
Phones & Addresses
Bradford Chew
President
BAY CITIES BIBLE INSTITUTE
College/University Religious Organization
318 27 St, Oakland, CA 94612
(510) 268-8060

Publications

Us Patents

Oximeter Sensor With Encoded Temperature Characteristic

View page
US Patent:
6356774, Mar 12, 2002
Filed:
Sep 28, 1999
Appl. No.:
09/407469
Inventors:
Michael J. Bernstein - San Ramon CA
Michael E. Fein - Mt. View CA
William L. Shea - Livermore CA
Willem A. Crone - Palermo CA
Paul D. Mannheimer - Danville CA
Bradford Chew - San Ramon CA
Adnan Merchant - Fremont CA
Assignee:
Mallinckrodt, Inc. - Hazelwood MO
International Classification:
A61B 500
US Classification:
600323, 600322, 600331
Abstract:
A method for operating an oximeter sensor, and corresponding apparatus, which includes an encoded temperature characteristic of a light emitter in the sensor. The encoded temperature characteristic is read, and is used to modify a drive of the light emitter in the sensor. This enables a light emitter to be operated at its maximum allowable intensity to maximize a signal to noise ratio, without burning a patient, in accordance with the particular characteristics of that light emitter.

Interconnect Circuit Between Non-Compatible Oximeter And Sensor

View page
US Patent:
6490466, Dec 3, 2002
Filed:
Sep 21, 2000
Appl. No.:
09/668032
Inventors:
Michael E. Fein - Mountain View CA
Bradford B. Chew - San Ramon CA
Assignee:
Mallinckrodt Inc. - Hazelwood MO
International Classification:
A61B 500
US Classification:
600323, 600322, 600331
Abstract:
An oximeter sensor adapter which allows a sensor without a resistor in parallel with its LEDs to operate with an oximeter expecting such a resistor in parallel. The adapter has a switching circuit which has inputs connected to the LED drive outputs of the oximeter. The switching circuit has two pairs of outputs, one connected to the LED drive lines of the sensor, and the other connected to a resistor in the adapter itself. The switching circuit is controlled by a sensing circuit which senses when a signal on the input lines drops below a predetermined level, such as 0. 5 volts. The sensing circuit, in response to a low voltage (corresponding to an attempt to read a resistor in parallel with the LEDs), will provide a signal to a switching circuit. The switching circuit will switch the resistor onto the input lines so that it can be read. When a higher voltage returns to the input lines, the switching circuit switches back to the LEDs themselves.

Oximeter Sensor Adapter With Coding Element

View page
US Patent:
6571113, May 27, 2003
Filed:
Sep 21, 2000
Appl. No.:
09/668127
Inventors:
Michael E. Fein - Mountain View CA
Bradford B. Chew - San Ramon CA
Assignee:
Mallinckrodt, Inc. - Hazelwood MO
International Classification:
A61B 500
US Classification:
600323, 600322, 600310
Abstract:
An oximeter sensor adapter which allows a sensor without a resistor in parallel with its LEDs to operate with an oximeter expecting such a resistor in parallel. The adapter includes LED drive electronics and appropriate oximeter drive current sensing circuitry for converting the drive signals from the oximeter into appropriate LED drive signals for the sensor. Instead of a resistor being on the sensor in parallel with one or more of the LEDs, the resistor is placed across the leads in front of the LED drive electronics and oximeter drive current sensing circuitry, on the oximeter side of the adapter. By providing LED drive electronics and oximeter drive current sensing circuitry which do not draw significant current at a low voltage, the oximeter is able to measure the resistor independently just as if it were in parallel with the LEDs.

Switch-Mode Oximeter Led Drive With A Single Inductor

View page
US Patent:
7120479, Oct 10, 2006
Filed:
Feb 25, 2004
Appl. No.:
10/787852
Inventors:
Bradford B Chew - San Ramon CA, US
Ethan Petersen - Castro Valley CA, US
William Shea - Livermore CA, US
Assignee:
Nellcor Puritan Bennett Inc. - Pleasanton CA
International Classification:
A61B 5/00
H05B 37/00
US Classification:
600323, 600310, 315186
Abstract:
A light emitter drive circuit for an oximeter which utilizes a single inductor for driving multiple light emitters. The inductor is connected to a switching circuit to multiple energy storage circuits, such as capacitors. These are alternately charged up, using the same inductor. Subsequently, the capacitors are alternately discharged for their corresponding light emitters through the same inductor. Also, the magnetic susceptibility of the LED drive circuit is reduced by using magnetic flux canceling in the inductor. In one embodiment, a toroidal inductor is used with geometric symmetry and its magnetic flux. In another embodiment, a dual core closed bobbin shielded inductor is used.

Led Forward Voltage Estimation In Pulse Oximeter

View page
US Patent:
7120480, Oct 10, 2006
Filed:
Feb 25, 2004
Appl. No.:
10/788243
Inventors:
Bradford B. Chew - San Ramon CA, US
Ethan Peterson - Castro Valley CA, US
William Shea - Livermore CA, US
Assignee:
Nellcor Puritan Bennett Inc. - Pleasanton CA
International Classification:
A61B 5/00
US Classification:
600323
Abstract:
An apparatus and method for determining if a forward voltage of an LED in a pulse oximeter is within a predetermined range. This is accomplished by measuring the current through the LED, and also by knowing the duty cycle of the pulse width modulator (PWM) drive signal to the LED.

Multi-Bit Adc With Sigma-Delta Modulation

View page
US Patent:
7142142, Nov 28, 2006
Filed:
Feb 25, 2004
Appl. No.:
10/787542
Inventors:
Ethan Petersen - Castro Valley CA, US
William Shea - Livermore CA, US
Bradford B. Chew - San Ramon CA, US
Assignee:
Nelicor Puritan Bennett, Inc. - Pleasanton CA
International Classification:
H03M 3/00
US Classification:
341143, 341172
Abstract:
An oximeter uses a sigma-delta modulator and a multi-bit ADC with PWM feedback enabling high precision multi-bit conversion. Demodulation is done in software, thus requiring only a single hardware path for both red and IR. Multiple capacitors are switched into the integrator in the sigma-delta modulator, with different capacitors for red, IR and dark signals, thus enabling the use of the single hardware path. A switching circuit at the input of the sigma-delta modulator acts as a sample and hold, controlled by the PWM feedback.

Oximeter Ambient Light Cancellation

View page
US Patent:
7190985, Mar 13, 2007
Filed:
Feb 25, 2004
Appl. No.:
10/787854
Inventors:
Ethan Petersen - Castro Valley CA, US
William Shea - Livermore CA, US
Bradford B. Chew - San Ramon CA, US
Assignee:
Nellcor Puritan Bennett Inc. - Pleasanton CA
International Classification:
A61B 5/00
US Classification:
600336, 600322, 600323
Abstract:
A pulse oximeter method and apparatus which provides (1) a notch filter at a distance between a modulation frequency and a common multiple of commonly used power line frequencies (50, 60, 100 and 120) and also (2) a demodulation frequency greater than a highest pulse rate of a person and lower than any harmonic of 50, 60, 100 or 120 Hz, to filter ambient light interference, while choosing an optimum demodulation frequency that avoids interference from the notch filter or from harmonics of the line interference. Also, ambient light for any low frequency interference, such as power line interference, is measured both before and after each of the light emitter wavelengths and the average of the ambient light is then subtracted from the detected signal.

Delta-Sigma Modulator For Outputting Analog Representation Of Physiological Signal

View page
US Patent:
7212847, May 1, 2007
Filed:
Feb 25, 2004
Appl. No.:
10/787853
Inventors:
Ethan Petersen - Castro Valley CA, US
William Shea - Livermore CA, US
Bradford B. Chew - San Ramon CA, US
Assignee:
Nellcor Puritan Bennett LLC - Pleasanton CA
International Classification:
A61B 5/00
US Classification:
600323, 600324, 600500
Abstract:
A method and apparatus for providing a substantially real-time representation of an analog representation of a physiological signal is provided. The waveform signal from the sensor is converted into digital form. A delta-sigma modulator is used as a simple Digital-to-analog Converter (DAC). The output can then be provided through a simple hardware filter to give an analog output signal in nearly real-time, which can be used for other instruments, synchronization, display, etc.
Control profile
Bradford B Chew from San Ramon, CA, age ~69 Get Report