Theodore L Lester

US Patent:

46757406, Jun 23, 1987

Filed:

Apr 12, 1985

Appl. No.:

6/722873

Inventors:

Michael P. Bafaro - Schaumburg IL
Theodore V. Lester - Schiller Park IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04N 318

US Classification:

358243

Abstract:

A scanning CRT display system is disclosed in which transitions of a horizontal sync signal are directly utilized to provide control signals for driving a FET (field effect transistor) power drive device which controls horizontal deflection yoke current. Protection circuitry is provided such that the FET power drive device is turned off if excessive FET through current is sensed, and protection circuitry also prevents turning on the FET drive device if an excessively high flyback voltage is present at the drain terminal of the FET device. Linearization of the horizontal deflection yoke current is provided by effectively sensing the temperature variable on resistance of the FET output drive device and providing a compensation control signal in accordance therewith, wherein this compensation control signal controls the magnetization provided by a control winding on a saturable magnetic core on which a linearity compensation coil is also wound. The linearity compensation coil and the deflection yoke are connected in series and the compensation control signal effectively reduces the series inductance of these elements so as to provide linearity compensation for horizontal deflection yoke current.

US Patent:

46493255, Mar 10, 1987

Filed:

Jan 21, 1986

Appl. No.:

6/820778

Inventors:

Thomas R. Guerin - Hoffman Estates IL
Theodore V. Lester - Schiller Park IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H01J 2952

US Classification:

315383

Abstract:

A scanning CRT control system is disclosed in which horizontal sync pulses are used to develop a pulse signal that provides an input to a transformer circuit also receiving a relatively low DC power supply input signal. The transformer circuit develops a very high DC voltage connected to a CRT screen while also providing a relatively lower voltage power supply signal that is utilized to develop the power supply signal provided to a video driver that controls beam excitation for the CRT. A compensation circuit is provided between the transformer circuit and a power supply terminal of the video driver such that a compensating signal is provided at the transformer circuit in accordance with each horizontal video scan line. The compensating signal has a frequency corresponding to the horizontal sweep frequency and a magnitude that varies in accordance with the average current loading of each individual horizontal scan line. In this manner the compensating signal will cause a variation in horizontal beam positioning so as to maintain horizontal orientation between different sequential horizontal scan lines regardless of the average beam current intensity of each of the horizontal scan lines.

US Patent:

20210271270, Sep 2, 2021

Filed:

Feb 28, 2020

Appl. No.:

16/805367

Inventors:

Michael Bafaro - Schaumburg IL, US
Theodore V. Lester - Schiller Park IL, US
Peter Paul Walter - Elgin IL, US

International Classification:

G05D 7/06
F16K 17/36
G01M 3/04

Abstract:

A system which detects gas leaks near devices which use “natural gas” or other flammable gases such as methane, ethane, propane or butane and implements multiple automatic responses to the detection of such leaks including emitting audible alarms, contacting utility and emergency service providers, and shutting off the flow of the flammable gases is disclosed. Optional to the system allowing the system to report on the approximate location of the leak and/or the approximate danger level caused by the leak by reporting on the gas/air ratios in the area are also disclosed. A method for implementing the method of the invention is also disclosed.