Jason R Lewis

US Patent:

20020104485, Aug 8, 2002

Filed:

Dec 11, 2001

Appl. No.:

10/015111

Inventors:

Jason Lewis - New Braunfels TX, US
Dennus Fitzsimmons - Cross Plains WI, US
Bruce Grill - Middleton WI, US
Steve Roudebush - Middleton WI, US

Assignee:

MS BioScience - Madison WI

International Classification:

A01K007/00
A01K029/00

US Classification:

119/072500, 119/651000

Abstract:

A dispensing device which controls a rate and an amount of discharge of a substance which may be used to treat animals for any number of reasons. The dispensing device has a tank including a top, a bottom and a cover. A movable piston is positioned within the tank, and the movable piston separates the tank into an upper chamber being above the movable piston and a lower chamber being below the movable piston. The dispensing device also includes a dispenser in fluid communication with the tank, and a dispensing head in fluid communication with the dispenser. The dispensing head further includes a plurality of apertures near an outer diameter of the dispensing head.

US Patent:

20210007192, Jan 7, 2021

Filed:

Mar 16, 2020

Appl. No.:

16/819497

Inventors:

- Coopersburg PA, US
Jason E. Lewis - Driftwood TX, US
David J. Knapp - Austin TX, US

Assignee:

Lutron Ketra, LLC - Coopersburg PA

International Classification:

H05B 45/10
G01J 3/46
G01J 3/50
G01J 1/02
G01J 3/02
H05B 45/22
H05B 45/24
H05B 47/10
H05B 47/105
H05B 47/24
H05B 47/21
G01J 1/32
G01J 1/42
G01R 31/44

Abstract:

An illumination device and method is provided herein for calibrating individual LEDs in the illumination device, so as to obtain a desired luminous flux and a desired chromaticity of the device over changes in drive current, temperature, and over time as the LEDs age. The calibration method may include subjecting the illumination device to a first ambient temperature, successively applying at least three different drive currents to a first LED to produce illumination at three or more different levels of brightness, obtaining a plurality of optical measurements from the illumination produced by the first LED at each of the at least three different drive currents, obtaining a plurality of electrical measurements from the photodetector and storing results of the obtaining steps within the illumination device to calibrate the first LED at the first ambient temperature. The plurality of optical measurements may generally include luminous flux and chromaticity, the plurality of electrical measurements may generally include induced photocurrents and forward voltages, and the calibration method steps may be repeated for each LED included within the illumination device and upon subjecting the illumination device to a second ambient temperature.

US Patent:

20170105260, Apr 13, 2017

Filed:

Dec 22, 2016

Appl. No.:

15/388607

Inventors:

- Austin TX, US
Jason E. Lewis - Driftwood TX, US
David J. Knapp - Austin TX, US

Assignee:

Ketra, Inc. - Austin TX

International Classification:

H05B 33/08
G01R 31/44
G01J 3/50
H05B 37/02
G01J 1/42
G01J 3/46

Abstract:

An illumination device and method is provided herein for calibrating individual LEDs in the illumination device, so as to obtain a desired luminous flux and a desired chromaticity of the device over changes in drive current, temperature, and over time as the LEDs age. The calibration method may include subjecting the illumination device to a first ambient temperature, successively applying at least three different drive currents to a first LED to produce illumination at three or more different levels of brightness, obtaining a plurality of optical measurements from the illumination produced by the first LED at each of the at least three different drive currents, obtaining a plurality of electrical measurements from the photodetector and storing results of the obtaining steps within the illumination device to calibrate the first LED at the first ambient temperature. The plurality of optical measurements may generally include luminous flux and chromaticity, the plurality of electrical measurements may generally include induced photocurrents and forward voltages, and the calibration method steps may be repeated for each LED included within the illumination device and upon subjecting the illumination device to a second ambient temperature.

US Patent:

20160066383, Mar 3, 2016

Filed:

Aug 28, 2014

Appl. No.:

14/471057

Inventors:

- Austin TX, US
Jason E. Lewis - Driftwood TX, US

International Classification:

H05B 33/08

Abstract:

An illumination device and method is provided herein for calibrating individual LEDs and photodetector(s) included within the illumination device, so as to obtain a desired luminous flux and a desired chromaticity of the device over time as the LEDs age. Specifically, a calibration method is provided herein for characterizing each emission LED and each photodetector separately. The wavelength and intensity of the illumination produced by each emission LED is accurately characterized over a plurality of different drive currents and ambient temperatures, and at least a subset of the wavelength and intensity measurement values are stored with a storage medium of the illumination device for each emission LED. The responsivity of the photodetector is accurately characterized over emitter wavelength and photodetector junction temperature, and results of said characterization are stored with the storage medium.

US Patent:

20160066384, Mar 3, 2016

Filed:

Aug 28, 2014

Appl. No.:

14/471081

Inventors:

- Austin TX, US
Jason E. Lewis - Driftwood TX, US

International Classification:

H05B 33/08

Abstract:

An illumination device and method is provided herein for controlling an LED illumination device, so that a desired luminous flux and a desired chromaticity of the device can be maintained over time as the LEDs age. According to one embodiment, the method determines an expected wavelength value and an expected intensity value for each emission LED included within the illumination device at the drive current currently applied to the emission LED and the present emitter forward voltage. In addition, the method determines a photodetector responsivity for each emission LED at the expected wavelength value and the present photodetector forward voltage. The photodetector responsivity calculated for each emission LED is used as a reference for adjusting the lumen output of the emission LED to account for LED aging affects.

US Patent:

20150377699, Dec 31, 2015

Filed:

Jun 25, 2014

Appl. No.:

14/314451

Inventors:

- Austin TX, US
Jason E. Lewis - Driftwood TX, US
David J. Knapp - Austin TX, US

International Classification:

G01J 1/44

Abstract:

An illumination device and method is provided herein for calibrating individual LEDs in the illumination device, so as to obtain a desired luminous flux and a desired chromaticity of the device over changes in drive current, temperature, and over time as the LEDs age. The calibration method may include subjecting the illumination device to a first ambient temperature, successively applying at least three different drive currents to a first LED to produce illumination at three or more different levels of brightness, obtaining a plurality of optical measurements from the illumination produced by the first LED at each of the at least three different drive currents, obtaining a plurality of electrical measurements from the photodetector and storing results of the obtaining steps within the illumination device to calibrate the first LED at the first ambient temperature. The plurality of optical measurements may generally include luminous flux and chromaticity, the plurality of electrical measurements may generally include induced photocurrents and forward voltages, and the calibration method steps may be repeated for each LED included within the illumination device and upon subjecting the illumination device to a second ambient temperature.

US Patent:

20150382422, Dec 31, 2015

Filed:

Jun 25, 2014

Appl. No.:

14/314530

Inventors:

- Austin TX, US
Jason E. Lewis - Driftwood TX, US
David J. Knapp - Austin TX, US

International Classification:

H05B 33/08

Abstract:

An illumination device and method is provided herein for controlling individual light emitting diodes (LEDs) in an LED illumination device, so that a desired luminous flux and a desired chromaticity of the device can be maintained over time as the LEDs age. According to one embodiment, the method comprises applying drive currents to a plurality of LED chains substantially continuously to produce illumination, measuring a photocurrent induced on the photodetector in response to the illumination produced by each LED chain, one LED chain at a time, and received by the photodetector, and measuring a forward voltage developed across the photodetector by applying a non-operative drive current to the photodetector. For each LED chain, the method may further comprise determining an expected photocurrent value corresponding to the forward voltage measured across the photodetector and the drive current currently applied to the LED chain by applying one or more interpolation techniques to a table of stored calibration values correlating forward voltage and photocurrent to drive current at a plurality of different temperatures, and adjusting the drive current currently applied to the LED chain if a difference exists between the expected photocurrent value and the measured photocurrent.