Patents by Inventor Brett E. Dahlgren
Brett E. Dahlgren has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11879844Abstract: An example device includes an array of sensor modules. A sensor module includes a body to be positioned in alignment with a planar target, a light source coupled to the body to emit light to the planar target along a source optical path, and a plurality of light sensors coupled to the body. Each light sensor is to sense a different wavelength of light received from the planar target along a sensor optical path. The sensor optical path is different from the source optical path. The bodies of the array of sensor modules are arranged in a planar tiling pattern with respect to a longitudinal axis of the planar target.Type: GrantFiled: April 30, 2019Date of Patent: January 23, 2024Assignee: Hewlett-Packard Development Company, L.P.Inventors: Alexander Govyadinov, Brett E. Dahlgren, Brian John Keefe
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Patent number: 11815430Abstract: A nucleic acid detection device includes a microfluidic opening and a sensor stack. The sensor stack includes an electrochemical electrode and a photodetector. The electrochemical electrode is formed of a conductive material that is transparent to a fluorescent emission, the electrochemical electrode including a first side and an opposite second side, wherein the first side is exposed to the microfluidic opening. The photodetector is positioned relative to the second side of the electrochemical electrode to optically receive the fluorescent emission when passed through the electrochemical electrode.Type: GrantFiled: February 22, 2019Date of Patent: November 14, 2023Assignee: Hewlett-Packard Development Company, L.P.Inventors: Alexander Govyadinov, Brett E. Dahlgren
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Publication number: 20230123792Abstract: The present disclosure is drawn to microfluidic devices. The microfluidic device includes a microfluidic well, a layered composite stack, and an optical sensor. The layered composite stack includes an optical filter composited with an etch-stopping layer. The optical filter defines the microfluidic well. The optical sensor is associated with the microfluidic well and has the optical filter positioned therebetween.Type: ApplicationFiled: March 31, 2020Publication date: April 20, 2023Applicant: Hewlett-Packard Development Company, L.P.Inventors: Alexander Govyadinov, Dennis M. LAZAROFF, Brett E. DAHLGREN, Stefan Enr LUCCHINI, Tod WOODFORD
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Publication number: 20230001412Abstract: A microfluidic reaction chamber with a reaction chamber circuit includes a microfluidic reaction chamber to contain a reaction fluid for amplification of nucleic acids, and a reaction chamber circuit disposed within the microfluidic reaction chamber. The microfluidic reaction chamber includes a base wall, a top wall parallel to the base wall and defined in part by a transparent lid, a first side wall, and a second side wall. The reaction chamber circuit is disposed within the microfluidic reaction chamber, and includes a top surface, a bottom surface, a first side wall, and a second side wall. The reaction chamber circuit is in fluidic contact with the reaction fluid and includes a photodetector to detect a fluorescence signal from a labeled fluorescent tag in the reaction fluid.Type: ApplicationFiled: January 21, 2020Publication date: January 5, 2023Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.Inventors: Alexander GOVYADINOV, Hilary Ely, Brett E DAHLGREN, Si-lam J. CHOY, Erik TORNIAINEN
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Publication number: 20220113255Abstract: An example device includes an array of sensor modules. A sensor module includes a body to be positioned in alignment with a planar target, a light source coupled to the body to emit light to the planar target along a source optical path, and a plurality of light sensors coupled to the body. Each light sensor is to sense a different wavelength of light received from the planar target along a sensor optical path. The sensor optical path is different from the source optical path. The bodies of the array of sensor modules are arranged in a planar tiling pattern with respect to a longitudinal axis of the planar target.Type: ApplicationFiled: April 30, 2019Publication date: April 14, 2022Applicant: Hewlett-Packard Development Company, L.P.Inventors: Alexander Govyadinov, Brett E. Dahlgren, Brian John Keefe
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Publication number: 20210372925Abstract: A nucleic acid detection device includes a microfluidic opening and a sensor stack. The sensor stack includes an electrochemical electrode and a photodetector. The electrochemical electrode is formed of a conductive material that is transparent to a fluorescent emission, the electrochemical electrode including a first side and an opposite second side, wherein the first side is exposed to the microfluidic opening. The photodetector is positioned relative to the second side of the electrochemical electrode to optically receive the fluorescent emission when passed through the electrochemical electrode.Type: ApplicationFiled: February 22, 2019Publication date: December 2, 2021Applicant: Hewlett-Packard Development Company, L.P.Inventors: Alexander Govyadinov, Brett E. Dahlgren
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Patent number: 10207508Abstract: In some examples, a print cartridge includes a monolithic molding, and a printhead die embedded into a molding. The printhead die has a front surface exposed outside the molding to dispense fluid drops through nozzles and an opposing back surface covered by the molding except at a channel in the molding through which fluid is to pass directly to the back surface. The printhead die also has a nozzle health sensor molded into the molding to detect defective nozzles in the printhead die.Type: GrantFiled: September 14, 2017Date of Patent: February 19, 2019Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.Inventors: Chien-Hua Chen, Michael W. Cumbie, Brett E. Dahlgren
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Publication number: 20180001642Abstract: In some examples, a print cartridge includes a monolithic molding, and a printhead die embedded into a molding. The printhead die has a front surface exposed outside the molding to dispense fluid drops through nozzles and an opposing back surface covered by the molding except at a channel in the molding through which fluid is to pass directly to the back surface. The printhead die also has a nozzle health sensor molded into the molding to detect defective nozzles in the printhead die.Type: ApplicationFiled: September 14, 2017Publication date: January 4, 2018Inventors: Chien-Hua Chen, Michael W. Cumbie, Brett E. Dahlgren
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Patent number: 9770909Abstract: In an implementation, a printhead includes a printhead die molded into a molding. The die has a front surface exposed outside the molding to dispense fluid drops through nozzles and an opposing back surface covered by the molding except at a channel in the molding through which fluid may pass directly to the back surface. The die also has a nozzle health sensor molded into the molding to detect defective nozzles in the printhead die.Type: GrantFiled: January 30, 2014Date of Patent: September 26, 2017Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.Inventors: Chien-Hua Chen, Michael W. Cumbie, Brett E. Dahlgren
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Patent number: 9651425Abstract: A color sensor array includes a plurality of sensors. Each of the plurality of sensors has a width dimension and a length dimension that is elongated with respect to the width dimension. The length dimensions of the sensors are substantially equal to one another and parallel to an illumination plane. Each of the plurality of sensors includes a face defined by opposing first and second elongated sides and opposing first and second non-elongated sides. The first non-elongated sides of the plurality of sensors are aligned with one another along an axis that is substantially perpendicular to the illumination plane.Type: GrantFiled: February 27, 2009Date of Patent: May 16, 2017Assignee: Hewlett-Packard Development Company, L.P.Inventors: Stephan R. Clark, Brett E. Dahlgren
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Publication number: 20160339695Abstract: In an implementation, a printhead includes a printhead die molded into a molding. The die has a front surface exposed outside the molding to dispense fluid drops through nozzles and an opposing back surface covered by the molding except at a channel in the molding through which fluid may pass directly to the back surface. The die also has a nozzle health sensor molded into the molding to detect defective nozzles in the printhead die.Type: ApplicationFiled: January 30, 2014Publication date: November 24, 2016Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.Inventors: Chien-Hua CHEN, Michael W. Cumbie, Brett E. Dahlgren
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Patent number: 9446590Abstract: In one example, a method for making diagonal openings in photodefinable glass includes exposing part of a body of photodefinable glass to a beam of light oriented diagonally to a surface of the body at an angle of 5° or greater measured with respect to a normal to the surface of the body and removing some or all of the part of the body exposed to the light beam to form a diagonal opening in the body.Type: GrantFiled: August 16, 2012Date of Patent: September 20, 2016Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.Inventors: Chien-Hua Chen, Silam J. Choy, Brett E. Dahlgren
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Patent number: 9259925Abstract: In one example, a drop detector includes a light source for illuminating drops passing through a drop zone, multiple light detectors near the light source for detecting light scattered off drops passing through the drop zone, and multiple lenses each configured to focus light from the drop zone on one of the light detectors. In one example, each light detector is arranged in the same plane with all of the other light detectors. In one example, the lenses are configured to focus light from two different spaces in the drop zone on different detectors or groups of detectors. In one example, the lenses are configured to focus light from a single space in the drop zone on multiple detectors.Type: GrantFiled: May 27, 2011Date of Patent: February 16, 2016Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.Inventors: Alexander Govyadinov, Brett E Dahlgren, Anton Nicholas Clarkson, Steven H. Walker, Daniel Burger, Trudy Benjamin
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Publication number: 20150210074Abstract: In one example, a method for making diagonal openings in photodefinable glass includes exposing part of a body of photodefinable glass to a beam of light oriented diagonally to a surface of the body at an angle of 5° or greater measured with respect to a normal to the surface of the body and removing some or all of the part of the body exposed to the light beam to form a diagonal opening in the body.Type: ApplicationFiled: August 16, 2012Publication date: July 30, 2015Inventors: Chien-Hua Chen, Silam J. Choy, Brett E. Dahlgren
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Patent number: 9007586Abstract: An optical system includes a lens, a pupil relay, and an aperture stop positioned at a focal point of the lens between the lens and the pupil relay. The lens is configured to collect a plurality of light bundles. Each light bundle emanates from a field point of an object plane and has a center ray substantially parallel to an optical axis of the lens. The lens is configured to direct the center ray of each light bundle through the aperture stop and onto the pupil relay. The pupil relay is configured to image a plane of the aperture stop onto a sensor array.Type: GrantFiled: April 20, 2009Date of Patent: April 14, 2015Assignee: Hewlett-Packard Development Company, L.P.Inventors: Stephan Clark, Brett E. Dahlgren
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Patent number: 8687193Abstract: A color measurement device includes a light pipe and a light source. The light pipe is oriented length-wise towards a color sample surface along a first axis that is non-perpendicular to the surface. A color sample is positioned on the surface. The light pipe has a near opening, a far opening, and a face at the far opening. The near opening is closer to the color sample than the far opening. The light source is positioned near the far opening of the light pipe, and is to output light along a second axis and into the light pipe at the far opening. The light reflects off the surface after exiting the light pipe at the near opening. The second axis is non-perpendicular to the face of the light pipe at the far opening. The light non-uniformly illuminates the color sample after exiting the light pipe at the near opening.Type: GrantFiled: October 31, 2008Date of Patent: April 1, 2014Assignee: Hewlett-Packard Development Company, L.P.Inventors: Brett E. Dahlgren, Stephan R. Clark
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Publication number: 20140078213Abstract: In one example, a drop detector includes a light source for illuminating drops passing through a drop zone, multiple light detectors near the light source for detecting light scattered off drops passing through the drop zone, and multiple lenses each configured to focus light from the drop zone on one of the light detectors. In one example, each light detector is arranged in the same plane with all of the other light detectors. In one example, the lenses are configured to focus light from two different spaces in the drop zone on different detectors or groups of detectors. In one example, the lenses are configured to focus light from a single space in the drop zone on multiple detectors.Type: ApplicationFiled: May 27, 2011Publication date: March 20, 2014Inventors: Alexander Govyadinov, Brett E. Dahlgren, Anton Nicholas Clarkson, Steven H. Walker, Daniel Burger, Trudy Benjamin
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Patent number: 8665438Abstract: A color sensing apparatus includes an optical system that produces a spatially uniform light beam independent of the use of a diffusion chamber, and a color sensor that senses reflected light of a reflection of the spatially uniform light beam, wherein the optical system includes a light integrator with a tapered inlet surface and a lens secured to an exit plane thereof.Type: GrantFiled: January 30, 2013Date of Patent: March 4, 2014Assignee: Hewlett-Packard Development Company, L.P.Inventors: Stephan R. Clark, Brett E. Dahlgren
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Patent number: 8665381Abstract: One embodiment of a viewing cone adjustment system includes a projection lens that defines a projection lens optical axis adjustably offset from a viewing screen optical axis, and an image source device that defines an image source optical axis adjustably offset from the projection lens optical axis.Type: GrantFiled: April 22, 2005Date of Patent: March 4, 2014Assignee: Hewlett-Packard Development Company, L.P.Inventor: Brett E. Dahlgren
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Patent number: 8625157Abstract: A method includes collecting, within a printer body, ambient light entering the printer body. Characteristics of the collected ambient light are measured. A color profile based on the measured characteristics is identified. The identified color profile is provided for use in forming a color image on a medium.Type: GrantFiled: October 23, 2009Date of Patent: January 7, 2014Assignee: Hewlett-Packard Development Company, L.P.Inventors: Oscar Martinez, Brett E Dahlgren