Mark M Mathews

US Patent:

6762577, Jul 13, 2004

Filed:

Nov 14, 2001

Appl. No.:

09/993783

Inventors:

Steven Gray - Prospect KY
Wolfgang Daum - Louisville KY
John Steven Holmes - Sellersburg IN
Rollie Richard Herzog - Louisville KY
Mark Robert Mathews - Lombard IL

Assignee:

General Electric Company - Schenectady NY

International Classification:

H02P 729

US Classification:

318268, 318432, 388909

Abstract:

A method for controlling speed in a pulse-width-modulation-controlled motor powered by a load voltage source is provided. The method includes the steps of measuring the motor load voltage, and setting a pulse-width-modulation duty cycle based on the measured voltage.

US Patent:

6782706, Aug 31, 2004

Filed:

Dec 22, 2000

Appl. No.:

09/742545

Inventors:

John S. Holmes - Sellersburg IN
Rollie R. Herzog - Louisville KY
Mark Robert Mathews - Lombard IL
Robert M. Bultman - Smithfield KY
Tim Holder - Lagrange KY
Wolfgang Daum - Louisville KY

Assignee:

General Electric Company - Schenectady NY

International Classification:

F25B 4902

US Classification:

62229, 62127, 62203, 62157

Abstract:

A control system for a refrigeration system having a refrigeration compartment and a quick chill/thaw pan. A main controller board, electrically connected to a temperature adjustment board and a dispenser board through the serial communications bus, controls the temperature of the refrigeration compartment and the quick chill/thaw pan. The control system accepts a plurality of inputs to determine a refrigeration mode and to execute a plurality of software algorithms to control the refrigeration compartment as both a chill pan to rapidly chill food and beverage items without freezing and a thaw pan to timely thaw frozen items at controlled temperature levels.

US Patent:

7005983, Feb 28, 2006

Filed:

Jan 5, 2001

Appl. No.:

09/754592

Inventors:

John Steven Holmes - Sellersburg IN, US
Rollie Richard Herzog - Louisville KY, US
Mark Robert Mathews - Lombard IL, US
Robert Marten Bultman - Smithfield KY, US

Assignee:

General Electric Company - Schenectady NY

International Classification:

G08B 13/08

US Classification:

3405456, 3406861, 49 13

Abstract:

A detection apparatus for detecting refrigerator door openings is coupled to at least one switch configured to be activated by a door opening. When the door is opened, the switch is activated and inputs a signal to the detection apparatus. The detection apparatus rectifies the signal; and phase-shifts the rectified signal so that it leads or lags the line voltage. The shifted output signal is fed to a processor that detects the opening of the door based upon the shifted signal. Signals output by a plurality of switches that generate a signal when activated mixed using an opto-coupler. Relative impedance of the lead and lag circuits may be adjusted to differentiate a phase shift of one shifted signal relative to another signal. The processor converts a value in degrees of phase shifting of the mixed signal to a time value, and based upon the time value, the processor determines which of the doors is open.

US Patent:

7644590, Jan 12, 2010

Filed:

Aug 16, 2004

Appl. No.:

10/919081

Inventors:

John S. Holmes - Sellersburg IN, US
Rollie R. Herzog - Louisville KY, US
Mark Robert Mathews - Lombard IL, US
Robert M. Bultman - Smithfield KY, US
Tim Holder - Lagrange KY, US
Wolfgang Daum - Louisville KY, US

Assignee:

General Electric Company - Schenectady NY

International Classification:

F25D 17/06
F25B 29/00

US Classification:

62 90, 165 63

Abstract:

A control system for a refrigeration system having a refrigeration compartment and a quick chill/thaw pan. A main controller board, electrically connected to a temperature adjustment board and a dispenser board through the serial communications bus, controls the temperature of the refrigeration compartment and the quick chill/thaw pan. The control system accepts a plurality of inputs to determine a refrigeration mode and to execute a plurality of software algorithms to control the refrigeration compartment as both a chill pan to rapidly chill food and beverage items without freezing and a thaw pan to timely thaw frozen items at controlled temperature levels.