WILLIAM J ALEXANDER
Engineers in Pittsburgh, PA
License number
Pennsylvania PE044206E
Category
Engineers
Type
Professional Engineer
Address
Address
Pittsburgh, PA 15241
Professional information
Sample Chuck With Compound Construction
US Patent:
6803780, Oct 12, 2004
Filed:
May 3, 2002
Appl. No.:
10/139685
Inventors:
Michael John Adams - Olmstead Falls OH
William J. Alexander - Pittsburgh PA
William J. Alexander - Pittsburgh PA
Assignee:
Solid State Measurements, Inc. - Pittsburgh PA
International Classification:
G10R 3102
US Classification:
324755, 324766
Abstract:
A sample chuck for supporting sample semiconductor wafers during testing includes an upper layer formed from a semiconducting material laminated to a lower layer formed from a conducting material.
Vice President, Operations At Bacharach Inc.
Position:
Vice President, Operations at Bacharach Inc.
Location:
Greater Pittsburgh Area
Industry:
Electrical/Electronic Manufacturing
Work:
Bacharach Inc.
since Sep 2009
-
Vice President, Operations
Solid State Measurements
2000 - 2009
-
Vice President
Device And Method For Indicating If An Airplane Is Operating Within Operating Limits
US Patent:
5912627, Jun 15, 1999
Filed:
Oct 17, 1997
Appl. No.:
8/953281
Inventors:
William J. Alexander - Pittsburgh PA
International Classification:
G08B 500
US Classification:
3408154
Abstract:
The present invention provides a device for indicating an operating point of an aircraft comprising a sensor to measure air speed and a sensor to measure vertical acceleration. The device also comprises a processor in communicative connection with each of the airspeed sensor and the vertical acceleration sensor. The processor is also in communicative connection with a display. The display presents an operating envelope diagram of the aircraft. The display also displays the current operating point of the aircraft relative to the operating envelope diagram. The present invention also provides a method for indicating an operating point of an aircraft in which the operating envelope diagram and the measured operating point of the aircraft are displayed upon the same display.
Combustible Gas Detector Having Temperature Stabilization Capability
US Patent:
4818977, Apr 4, 1989
Filed:
Nov 3, 1987
Appl. No.:
7/116163
Inventors:
William J. Alexander - Pittsburgh PA
Assignee:
Mine Safety Appliances Company - Pittsburgh PA
International Classification:
G08B 1710
US Classification:
340633
Abstract:
A catalytic gas detector circuit in which the temperature of a resistance gas sensing element, contained in a bridge circuit, is reduced and therefore stabilized by energizing a transistor to draw off current from the sensing element when the sensing element is exposed to high concentrations of combustible hydrocarbon gases.
Method And Apparatus For Testing Semiconductor Wafers
US Patent:
6851096, Feb 1, 2005
Filed:
Aug 8, 2002
Appl. No.:
10/215383
Inventors:
William J. Alexander - Pittsburgh PA, US
Assignee:
Solid State Measurements, Inc. - Pittsburgh PA
International Classification:
G06F 1750, G01R 3126, G01R 3100, H01L 2166
US Classification:
716 4, 324500, 324754, 438 17
Abstract:
A wafer testing apparatus comprises a sample chuck having a flat surface for supporting a test wafer positioned thereon, the sample chuck having a base structure manufactured of a conductive metal and having a semiconductor layer secured to the base structure defining the flat surface of the sample chuck, an electrical test probe establishing a correction factor corresponding to a location on the semiconductor layer surface to be used to report an electrical property at a location on a test wafer substantially unaffected by the electrical properties of the semiconductor layer and base structure below that location.