Joseph A Lafrenz

US Patent:

54312035, Jul 11, 1995

Filed:

Aug 12, 1993

Appl. No.:

8/106304

Inventors:

Richard M. Schultz - Marengo IL
Arthur M. Koch - Barrington IL
Joseph A. Lafrenz - Schaumburg IL
Andrew K. Miraldi - Marengo IL

Assignee:

R. M. Schultz & Associates, Inc. - McHenry IL

International Classification:

B65B 104
B65B 304

US Classification:

141197

Abstract:

An automatic filling system for a compressed gas tank includes a controller that measures the rate of fill of a tank being filled in order to provide an accurate estimate of the fill time for the tank, given available source pressure. Compressed gas flow is controlled with on/off valves that are driven open by a motor/gearbox/clutch combination to reduce thermal and physical shocks associated with opening of the valve. Whenever power is removed from the clutch, a spring automatically drives the valves closed quickly to provide fail-safe operation.

US Patent:

41433238, Mar 6, 1979

Filed:

May 11, 1977

Appl. No.:

5/795778

Inventors:

Richard F. Cieslak - Algonquin IL
John V. Balding - Palatine IL
Joseph Lafrenz - Schaumburg IL

Assignee:

Industrial Electronics Service Company - Schaumburg IL

International Classification:

H04B 1700

US Classification:

325363

Abstract:

Circuitry for attachment to a radio receiver to monitor and test a detected intermediate frequency signal and an audio signal from a demodulator portion of the receiver to determine whether a transmitted radio frequency signal is within frequency tolerances and modulation limits and to provide an alarm, either visual or audio, when the limits or tolerances are exceeded. An off frequency monitor tests the DC component of the radio demodulator detected IF signal and includes input signal conditioning circuitry for filtering the audio signal, high impedance for minimal loading of the radio, and level shifting. Upper and lower level voltage references indicate maximum permissible frequency deviation from the nominal transmitting frequency. Upper and lower level comparators compare the conditioned direct current (DC) signal to the respective voltage references and provide a changed output state upon an out of tolerance transmission. An over modulation detector, generally in parallel with the off frequency monitor, provides a changed output state of a minimum time duration whenever the modulation limits are exceeded, and includes AC coupling to block the DC component of the radio detector signal, a voltage reference indicative of the maximum modulation level, a comparator for comparing the audio signal to the voltage reference, pulse stretching circuitry to provide a minimum time duration output for intermittent over modulation conditions.

US Patent:

51175622, Jun 2, 1992

Filed:

Apr 14, 1989

Appl. No.:

7/339023

Inventors:

Robert C. Dulay - Wheeling IL
Andrew K. Miraldi - Marengo IL
Joseph A. Lafrenz - Schaumburg IL
Robert T. Seaberg - Fontana WI

International Classification:

F26B 1900

US Classification:

34 48

Abstract:

A radiant energy ink drying device for drying ink on paper exiting a printer includes a lightbox, cooling fans for cooling the light box, and a processing unit. The processing unit controls the operation of the cooling fans based on signals received from a temperature sensor located in the drying area of the lightbox. The processing unit also deactivates the printer based on signals from a paper sensor located on the light box. In addition, an overtemperature sensor deactivates the printer when the light box housing exceeds a predetermined temperature.

US Patent:

42349648, Nov 18, 1980

Filed:

Oct 2, 1978

Appl. No.:

5/948054

Inventors:

Richard F. Cieslak - Algonquin IL
John V. Balding - Palatine IL
Joseph Lafrenz - Schaumburg IL

Assignee:

Industrial Electronics Service Company - Schaumburg IL

International Classification:

H04B 1700

US Classification:

455226

Abstract:

Circuitry for attachment to a radio receiver to monitor and test a detected intermediate frequency signal and an audio signal from a demodulator portion of the receiver to determine whether a transmitted radio frequency signal is within frequency tolerances and modulation limits and to provide an alarm, either visual or audio, when the limits or tolerances are exceeded. An off frequency monitor tests the DC component of the radio demodulator detected IF signal and includes input signal conditioning circuitry for filtering the audio signal, high impedance for minimal loading of the radio, and level shifting. Upper and lower level voltage references indicate maximum permissible frequency deviation from the nominal transmitting frequency. Upper and lower level comparators compare the conditioned direct current (DC) signal to the respective voltage references and provide a changed output state upon an out of tolerance transmission. An over modulation detector, generally in parallel with the off frequency monitor, provides a changed output state of a minimum time duration whenever the modulation limits are exceeded, and includes AC coupling to block the DC component of the radio detector signal, a voltage reference indicative of the maximum modulation level, a comparator for comparing the audio signal to the voltage reference, pulse stretching circuitry to provide a minimum time duration output for intermittent over modulation conditions.