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David C Tigwell

from Houston, TX
Age ~69
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Also known as:
David Charles Tigwell, David C Digwell
Phone and address:
198 Oak Place Dr, Houston, TX 77006
(713) 806-5103
Related to:
Anna M Sepulveda, 63
Connected to:
Donna F Tihalas, 73George Tihalas, 69Robin T Tihansky, 61Adam D Tihany, 77Lawrence D Tihen, 83Andrea L Tihlarik, 43Pamela C Tihonovich, 72Mariana G Tihova, 75Amy J Tiihonen, 60Debra K Tiihonen, 66

David Tigwell Phones & Addresses

  • 198 Oak Place Dr, Houston, TX 77006 (713) 806-5103
  • 4133 Cason St, Houston, TX 77005
  • 7272 37Th St N, Wichita, KS 67226
  • Dallas, TX
  • Atlanta, GA
  • Spring, TX

Resumes

Resumes

David Tigwell Photo 1

President

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Location:
Houston, TX
Industry:
Industrial Automation
Work:
Peek Measurement 1993 - 1997
Director of Engineering
Chronotek Systems 1993 - 1997
President
Skills:
Product Development
Electronics
Engineering Management
Lean Manufacturing
Manufacturing
Continuous Improvement
Engineering
David Tigwell Photo 2

David Tigwell

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Location:
Houston, TX
Industry:
Semiconductors

Business Records

Name / Title
Company / Classification
Phones & Addresses
David C Tigwell
President
CHRONOTEK SYSTEMS, LLC
Business Services · Engineering Services
4960 Willow St, Bellaire, TX 77401
4133 Cason St, Houston, TX 77005
4960 S Willow Dr, Houston, TX 77035

Publications

Us Patents

Single-Body Dual-Chip Orthogonal Sensing Transit-Time Flow Device Using A Parabolic Reflecting Surface

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US Patent:
6854339, Feb 15, 2005
Filed:
Dec 30, 2002
Appl. No.:
10/331950
Inventors:
Daniel Moscaritolo - Thousand Oaks CA, US
Francis H. Kantor - Newbury Park CA, US
Fermin A. Sandoval Diaz - Camarillo CA, US
David Tigwell - Houston TX, US
Assignee:
PTI Technologies, Inc. - Oxnard CA
D. C. Tigwell & Associates - Houston TX
International Classification:
G01F001/66
US Classification:
7386127
Abstract:
An ultrasonic sensor having a pair of ultrasound transducers adapted to be inserted in and being able to perform at a single site of introduction into a duct. The ultrasonic sensor measures a forward ultrasonic path transit time and a second reverse ultrasonic path transit time of ultrasound signals propagating in a fluid. The arrangement being such that a comparison of the signal associated with ultrasound travel in one direction with that of the signal associated with ultrasound travel in the opposite direction enables the flow rate of the fluid in the duct to be determined. The ultrasonic sensor may utilize a curved reflecting surface on the duct and a reflective surface of an ultrasonic sensor end cap to provide forward and reverse ultrasonic W-shaped paths.

Single-Body Dual-Chip Orthogonal Sensing Transit-Time Flow Device Using A Parabolic Reflecting Surface

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US Patent:
20040129088, Jul 8, 2004
Filed:
Dec 17, 2003
Appl. No.:
10/738497
Inventors:
Daniel Moscaritolo - Thousand Oaks CA, US
Francis Kantor - Newbury Park CA, US
Fermin Sandoval Diaz - Camarillo CA, US
David Tigwell - Houston TX, US
Assignee:
D.C. TIGWELL & ASSOCIATES - Houston TX
International Classification:
G01F001/20
US Classification:
073/861250
Abstract:
An ultrasonic sensor has a pair of ultrasound transducers and is adapted to be inserted in and able to perform at a single site of introduction into a duct, a manifold, or a pipe. The ultrasonic sensor measures a forward ultrasonic path transit time and a second reverse ultrasonic path transit time of ultrasound signals propagating in a fluid. The arrangement being such that a comparison of the signal associated with ultrasound travel in one direction with that of the signal associated with ultrasound travel in the opposite direction enables the flow rate of the fluid in the duct to be determined. The ultrasonic sensor may utilize a curved reflecting surface on the duct and a reflective surface of an ultrasonic sensor end cap or housing to provide forward and reverse ultrasonic W-shaped paths.

Single-Body Dual-Chip Orthogonal Sensing Transit-Time Flow Device Using A Parabolic Relecting Surface

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US Patent:
20050092102, May 5, 2005
Filed:
Nov 12, 2004
Appl. No.:
10/987568
Inventors:
Daniel Moscaritolo - Thousand Oaks CA, US
Francis Kantor - Newbury Park CA, US
Fermin Sandoval Diaz - Camarillo CA, US
David Tigwell - Houston TX, US
International Classification:
G01F001/66
US Classification:
073861270
Abstract:
An ultrasonic sensor, including methods of using and installing same, the sensor having a pair of ultrasound transducers adapted to be inserted in, and being able to perform at, a single site of introduction into a duct. The ultrasonic sensor measures a forward ultrasonic path transit time and a second reverse ultrasonic path transit time of ultrasound signals propagating in a fluid, the arrangement being such that a comparison of the signal associated with ultrasound travel in one direction with the signal associated with ultrasound travel in the opposite direction enables the flow rate of the fluid in the duct to be determined. The ultrasonic sensor may utilize a curved reflecting surface on the duct and a reflective surface of an ultrasonic sensor end cap to provide forward and reverse ultrasonic W-shaped paths.

Slotted Waveguide Acoustic Output Device And Method

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US Patent:
20090274313, Nov 5, 2009
Filed:
May 5, 2008
Appl. No.:
12/114908
Inventors:
W. Richard Klein - Houston TX, US
Domingo Castro, JR. - Houston TX, US
David C. Tigwell - Houston TX, US
International Classification:
H04R 29/00
H04R 1/20
US Classification:
381 59, 381338
Abstract:
The present application is directed to an omnidirectional sound emitting device comprising an acoustic slotted waveguide array; and an acoustic source in communication with the acoustic slotted waveguide array. The device is configured to project an acoustic beam at distance up to about two nautical miles or more.

Apparatus For Measuring Minority Carrier Lifetime And Method For Using The Same

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US Patent:
20110169520, Jul 14, 2011
Filed:
Jan 14, 2010
Appl. No.:
12/687855
Inventors:
G. Lorimer MILLER - Eastham MA, US
Joseph W. FOSTER - San Jose CA, US
David C. TIGWELL - Houston TX, US
Assignee:
MKS INSTRUMENTS, INC. - ANDOVER MA
International Classification:
G01R 31/26
G01R 31/00
H01F 17/06
US Classification:
32476201, 324555, 336178
Abstract:
An apparatus for measuring minority carrier lifetime is provided. The apparatus includes a resonant circuit having an inductor and a capacitor and configured to resonate at a measurement frequency. The apparatus also includes a ferromagnetic core having a first portion and a second portion. The first portion defines a gap and can be configured to direct therealong a magnetic field established by the inductor, such that lateral spreading of the magnetic field outside of the first portion is inhibited, and to direct the magnetic field generally uniformly across the gap. The second portion can be configured to direct the magnetic field therealong and, in conjunction with the first portion, into a closed loop. A radiation source can be configured to irradiate an area proximal to the gap defined by the first portion of the ferromagnetic core.

Measuring Minority Carrier Lifetime

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US Patent:
20120081132, Apr 5, 2012
Filed:
Apr 5, 2011
Appl. No.:
13/080451
Inventors:
Francisco Machuca - Oakland CA, US
Ronald Chiarello - Lafayette CA, US
G. Lorimer Miller - Eastham MA, US
Joseph W. Foster - San Jose CA, US
David C. Tigwell - Houston TX, US
Assignee:
MKS Instruments, Inc. - Andover MA
International Classification:
G01R 27/28
H01F 17/06
US Classification:
324655, 336105
Abstract:
An apparatus includes a member including a ferromagnetic material, an inductance-capacitance resonant circuit, a substrate disposed relative to the member, and a plurality of radiation sources. The member includes a post disposed at its center and a surface extending to an outer wall. The member defines a gap between the post and the outer wall. The inductance-capacitance resonant circuit is configured to resonate at a measurement frequency. The circuit includes an inductor disposed relative to the post. The substrate is disposed relative to the member. The substrate is electromagnetically coupled to the inductor. The plurality of radiation sources is disposed radially outward from and circumferentially around the post of the member. The apparatus can be used to simultaneously measure conductance (inverse sheet resistance), steady state photoconductance, true steady state minority carrier lifetime, photoconductance build-up and photoconductance decay lifetime.

Measuring Bulk Lifetime

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US Patent:
20120286806, Nov 15, 2012
Filed:
Nov 9, 2011
Appl. No.:
13/292850
Inventors:
Francisco Machuca - Oakland CA, US
Ronald Chiarello - Lafayette CA, US
G. Lorimer Miller - Eastham MA, US
Joseph W. Foster - San Jose CA, US
David C. Tigwell - Houston TX, US
David Cornwell - Chester, GB
International Classification:
G01N 27/02
US Classification:
324655
Abstract:
A substrate is electromagnetically coupled into an inductance-capacitance resonant circuit formed from (i) a member comprising a ferromagnetic material, (ii) an inductor and (iii) the substrate. The substrate is illuminated for a first time period X to cause photoconduction in the substrate. Decay in conductivity of the substrate is monitored for a second time period Y. The ratio of X to Y is greater than 1:10. Bulk lifetime of the substrate is determined from the decay.

Remote Control System

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US Patent:
60213191, Feb 1, 2000
Filed:
Nov 14, 1994
Appl. No.:
8/338374
Inventors:
David C. Tigwell - Spring TX
Assignee:
Colorado Meadowlark Corporation - Little CO
International Classification:
H04B 1404
US Classification:
4551512
Abstract:
A remote control system having a universal transmitter capable of being programmed to match the frequency and modulation pattern of any pulse modulated remote control transmitter. The system combines the universal transmitter and a separate apparatus for programming the universal transmitter. The programming unit detects the frequency and modulation pattern transmitted by a selected transmitter. The programming unit transfers the detected modulation pattern to the universal transmitter. The universal transmitter is operative to transmit the frequency detected by the programming unit. The universal transmitter thus duplicates the transmission of the selected transmitter. The system, apparatus and methods of this invention are particularly well adapted for application to low cost remote control transmitters permanently installed in vehicles.
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David C Tigwell from Houston, TX, age ~69 Get Report