Geoffrey B Wilson

US Patent:

6396484, May 28, 2002

Filed:

Sep 29, 1999

Appl. No.:

09/408818

Inventors:

Robert Adler - Northbrook IL
Arie Ravid - Newark CA
Geoffrey D. Wilson - Oxnard CA

Assignee:

Elo Touchsystems, Inc. - Fremont CA

International Classification:

G09G 500

US Classification:

345177, 345173, 345176

Abstract:

A method and apparatus for adapting an acoustic touchscreen controller to the operating frequency requirements of a specific touchscreen are provided. The adaptive controller can either utilize look-up tables to achieve the desired output frequency or the it can use a multi-step process in which it first determines the frequency requirements of the touchscreen, and then adjusts the burst frequency characteristics, the receiver circuit center frequency, or both in accordance with the touchscreen requirements. In one embodiment, the adaptive controller compensates for global frequency mismatch errors. In this embodiment a digital multiplier is used to modify the output of a crystal reference oscillator. The reference oscillator output is used to control the frequency of the signal from the receiving transducers and/or to generate the desired frequency of the tone burst sent to the transmitting transducers. In another embodiment that is intended to compensate for both global and local frequency variations, the adaptive controller uses a digital signal processor.

US Patent:

6492979, Dec 10, 2002

Filed:

Sep 7, 1999

Appl. No.:

09/391352

Inventors:

Joel Kent - Fremont CA
Geoffrey D. Wilson - Oxnard CA

Assignee:

Elo TouchSystems, Inc. - Fremont CA

International Classification:

G09G 500

US Classification:

345173, 345174, 345179, 345156, 345178, 345175, 178 189, 178 1809, 178 1805, 178 1803, 178 1801

Abstract:

A method and apparatus for discriminating against false touches in a touchscreen system is provided. The system is designed to confirm a touch registered by one touch sensor with another touch sensor, preferably of a different sensor type, prior to acting upon the touch (i. e. , sending touch coordinates to the operating system). If the touch registered by the first touch sensor is not confirmed by the second touch sensor, the touch is invalidated. Thus the strengths of one type of sensor are used to overcome the deficiencies of another type of sensor. This system is particularly well suited to meet the demands of an outdoor or semi-outdoor application. In one embodiment, one or more force sensors are used as the false touch sensor and a projective-capacitive sensor is used as the position coordinate determining sensor. In another embodiment, a projective-capacitive sensor is used as the false touch sensor. As the projective-capacitive sensor is only being used to provide touch confirmation, in this embodiment very few electrodes are required as well as minimal channel electronics.

US Patent:

6504530, Jan 7, 2003

Filed:

Sep 7, 1999

Appl. No.:

09/390207

Inventors:

Geoffrey D. Wilson - Oxnard CA
Victor E. Borgnis - Fremont CA
Joel Kent - Fremont CA
Mike Lewis - Oakland CA
Drew Loucks - San Jose CA
James Roney - Fremont CA
Michael Bruno Patti - San Francisco CA

Assignee:

ELO Touchsystems, Inc. - Fremont CA

International Classification:

G09G 500

US Classification:

345173, 345174, 345175, 345177

Abstract:

A method and apparatus for discriminating against false touches in a touchscreen system is provided. The system is designed to confirm a touch registered by one touch sensor with another touch sensor, preferably of a different sensor type, prior to acting upon the touch (i. e. , sending touch coordinates to the operating system). If the touch registered by the first touch sensor is not confirmed by the second touch sensor, the touch is invalidated. Thus the strengths of one type of sensor are used to overcome the deficiencies of another type of sensor. In one aspect, the secondary touch sensor comprises a force sensor to discriminate between true and false touches on other types of touch sensors, such as contaminants on optical and surface acoustic wave sensors, noise or weak signals on capacitive sensors, etc. The force sensor may be a simple one-element system that merely indicates that a touch has occurred or a multi-element system that can provide confirming or supplementary coordinate data. In another aspect, a capacitive sensor is used to confirm or veto touch data from optical, surface acoustic wave, and force sensors.

US Patent:

6630929, Oct 7, 2003

Filed:

Sep 29, 1999

Appl. No.:

09/408594

Inventors:

Robert Adler - Northbrook IL
Joel Kent - Fremont CA
Jeffrey L. Sharp - Ruckersville VA
Geoffrey D. Wilson - Oxnard CA

Assignee:

ELO Touchsystems, Inc. - Fremont CA

International Classification:

G09G 500

US Classification:

345177, 345173, 345176, 178 1804

Abstract:

A method and apparatus for adapting an acoustic touchscreen controller to the operating frequency requirements of a specific touchscreen are provided. The adaptive controller can either utilize look-up tables to achieve the desired output frequency or the it can use a multi-step process in which it first determines the frequency requirements of the touchscreen, and then adjusts the burst frequency characteristics, the receiver circuit center frequency, or both in accordance with the touchscreen requirements. In one embodiment, the adaptive controller compensates for global frequency mismatch errors. In this embodiment a digital multiplier is used to modify the output of a crystal reference oscillator. The reference oscillator output is used to control the frequency of the signal from the receiving transducers and/or to generate the desired frequency of the tone burst sent to the transmitting transducers. In another embodiment that is intended to compensate for both global and local frequency variations, the adaptive controller uses a digital signal processor.

US Patent:

43882226, Jun 14, 1983

Filed:

Jun 7, 1979

Appl. No.:

6/046466

Inventors:

Geoffrey Wilson - Westlake Village CA
Masami Kayamoto - Whittier CA

Assignee:

Filtrol Corporation - Los Angeles CA

International Classification:

B01J 2104
B01J 2385
B01J 2388
B01J 2718

US Classification:

252437

Abstract:

This invention relates to improvements in substrates containing alumina and a Group IV-B oxide and in producing the same and in processes of producing hydrodesulfurizing catalysts based on Group VIII and Group VI-B in the catalysts employing such substrates, and hydrodesulfurizing process employing the same.

US Patent:

62784447, Aug 21, 2001

Filed:

Aug 21, 1998

Appl. No.:

9/138289

Inventors:

Geoffrey D. Wilson - Oxnard CA
Joe H. Babb - Knoxville TN

International Classification:

G08C 2100

US Classification:

345173

Abstract:

A method and apparatus for making a five-wire touch-screen compatible with a four-wire interface is provided. A non-microprocessor-based converter is used that can be integrated directly into the touch-screen housing or the screen-to-interface ribbon cable. In one aspect of the converter, an analog logic and switching element routes the reference voltage from the four-wire controller to a current injection control device. The current injection control device applies a constant current to the outermost screen member of the touch-screen. When the outermost screen member and the innermost screen member of the touch screen come into contact, the current from the outermost member is injected into the resistive coating of the innermost member at the point of contact. The injected current is distributed to the four contact electrodes of the innermost member in direct proportion to the coordinates of the point of contact. Each of the four currents is converted to a voltage and routed to a logic amplifier that outputs a pair of voltages proportional to the x- and y-coordinates of the compression point.

US Patent:

40187144, Apr 19, 1977

Filed:

Dec 3, 1975

Appl. No.:

5/637363

Inventors:

Geoffrey R. Wilson - Westlake Village CA
Masami Kayamoto - Whittier CA

Assignee:

Filtrol Corporation - Los Angeles CA

International Classification:

B01J 2104
B01J 2106
B01J 2384
B01J 2388

US Classification:

252465

Abstract:

A shaped hydrodesulfurization catalyst comprising a nonzeolitic substrate impregnated with a Group VI and a Group VIII catalytic metal and with a Group IV-B promoter and having a high resistance to abrasion and a process of producing the same employing a substantially nonacid Group IV-B metal compound as the source of the Group IV-B promoter.

US Patent:

41961013, Apr 1, 1980

Filed:

Feb 3, 1978

Appl. No.:

5/874753

Inventors:

Geoffrey R. Wilson - Westlake Village CA
Masami Kayamoto - Whittier CA

Assignee:

Filtrol Corporation - Los Angeles CA

International Classification:

B01J 2104
B01J 2106
B01J 2316
B01J 2374
B01J 2704

US Classification:

252439

Abstract:

Shaped alumina pellets containing titania, catalysts employing the same, and process for producing the same.