Patents by Inventor Eric G. Nelson
Eric G. Nelson 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: 11334003Abstract: A binary ink developer (BID) may include a power supply electrically coupled to an electrode, a developer roller, and a cleaner roller. The BID may also include a controller to determine a level of image ghosting based on a sum of currents at the electrode, the developer roller and the cleaner roller, and instruct the power supply to provide an adjusted voltage to the cleaner roller in response to a determination of the level of image ghosting.Type: GrantFiled: December 18, 2018Date of Patent: May 17, 2022Assignee: Hewlett-Packard Development Company, L.P.Inventor: Eric G. Nelson
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Publication number: 20220146950Abstract: A photoconductor marking apparatus is disclosed. The apparatus includes a radiation source to emit radiation capable of irreversibly modifying photoconductive properties of a layer of a multi-layered photoconductor. The apparatus also includes processing apparatus to: determine a pattern to be applied to a photoconductor to be used in a print apparatus, the photoconductor having an imaging area within which print agent is to be deposited; and control the radiation source to direct radiation towards the photoconductor in a region outside the imaging area, so as to irreversibly modify photoconductive properties of a layer of the photoconductor according to the determined pattern. A method and a machine-readable medium are also disclosed.Type: ApplicationFiled: October 18, 2019Publication date: May 12, 2022Applicant: Hewlett-Packard Development Company, L.P.Inventors: Eric G. NELSON, Barry J. OLDFIELD
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Patent number: 11320761Abstract: An electrophotographic printer includes a charge roller in charge-transferring relation to a photoconductive imaging portion. The printer may determine an AC voltage setpoint of the charge roller.Type: GrantFiled: December 20, 2018Date of Patent: May 3, 2022Assignee: Hewlett-Packard Development Company, L.P.Inventors: Seongsik Chang, Brad Thomas Dransfield, Eric G. Nelson, Bruce J. Jackson, Omer Gila, Anthony William McLennan, Asaf Anufa, Daniel Espinosa
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Publication number: 20210302860Abstract: An electrophotographic printer includes a charge roller in charge-transferring relation to a photoconductive imaging portion. The printer may determine an AC voltage setpoint of the charge roller.Type: ApplicationFiled: December 20, 2018Publication date: September 30, 2021Applicant: Hewlett-Packard Development Company, L.P.Inventors: Seongsik Chang, Brad Thomas Dransfield, Eric G. Nelson, Bruce J. Jackson, Omer Gila, Anthony William McLennan, Asaf An ufa, Daniel Espinosa
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Publication number: 20210302877Abstract: A binary ink developer (BID) may include a power supply electrically coupled to an electrode, a developer roller, and a cleaner roller. The BID may also include a controller to determine a level of image ghosting based on a sum of currents at the electrode, the developer roller and the cleaner roller, and instruct the power supply to provide an adjusted voltage to the cleaner roller in response to a determination of the level of image ghosting.Type: ApplicationFiled: December 18, 2018Publication date: September 30, 2021Applicant: Hewlett-Packard Development Company, L.P.Inventor: Eric G. Nelson
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Patent number: 10908529Abstract: A print agent supply unit includes: an inlet chamber to distribute print agent within the print agent supply unit; a valve to selectively permit print agent into the inlet chamber, the valve including: a print agent inlet opening; and a valve member to selectively close the print agent inlet opening, the valve member being tapered towards an upstream end of the valve member.Type: GrantFiled: September 21, 2017Date of Patent: February 2, 2021Assignee: HP Indigo B.V.Inventors: Shachar Berger, Sagie Shanun, Ziv Yosef, Sarah Ann Russell, Eric G Nelson
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Patent number: 10795281Abstract: A method of balancing current in a developer roller is described. The method includes pulsing voltage to a squeegee roller and a cleaner roller. The pulsed voltage yields a differential voltage at the developer roller after impression. The method also includes pulsing compensating voltage to at least one of the squeegee roller or the cleaner roller to reduce or cancel an accumulated developer current imbalance of the developer roller. The compensating voltage pulses include pulses before or after the impression.Type: GrantFiled: August 24, 2017Date of Patent: October 6, 2020Assignee: HP Indigo B.V.Inventors: Guang Jin Li, Eric G Nelson, Ido Finkelman
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Patent number: 10719037Abstract: Example implementations provide a method of controlling an ink developer used in electro-photography; the method comprising, following cessation of printing, varying a plurality of voltages associated with movement of ink within the ink developer at temporally disparate times.Type: GrantFiled: May 29, 2019Date of Patent: July 21, 2020Assignee: HP Indigo B.V.Inventors: Eric G. Nelson, Yoav Nachmias, Vitaly Portnoy, Michel Assenheimer, Amiran Lavon
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Publication number: 20200209783Abstract: A print agent supply unit comprising: an inlet chamber to distribute print agent within the print agent supply unit; a valve to selectively permit print agent into the inlet chamber, the valve comprising: a print agent inlet opening; and a valve member to selectively close the print agent inlet opening, the valve member being tapered towards an upstream end of the valve member.Type: ApplicationFiled: September 21, 2017Publication date: July 2, 2020Inventors: Shachar Berger, Sagie Shanun, Ziv Yosef, Sarah Ann Russell, Eric G. Nelson
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Patent number: 10684571Abstract: An example system includes a power supply. The power supply is electrically coupled to an electrode, a developer roller, and a cleaner roller. The system also includes a controller. The controller is to instruct the power supply to reduce, at a first time, a magnitude of an electrode voltage supplied to the electrode. The controller also is to instruct the power supply to set, at a second time, a developer roller voltage and a cleaner roller voltage each to about a wet null voltage.Type: GrantFiled: August 19, 2015Date of Patent: June 16, 2020Assignee: HP Indigo B.V.Inventors: Eric G. Nelson, Yoav Nachmias, Michel Assenheimer, Vitaly Portnoy
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Patent number: 10663890Abstract: An example developer unit includes a developer roller. The developer unit also includes a set of electrodes proximate to the developer roller. The set of electrodes form a cavity. The developer unit includes an inlet to the cavity. The inlet is to receive printing fluid. The developer unit includes an insert in the inlet. The insert is to distribute the printing fluid evenly in the cavity.Type: GrantFiled: November 5, 2019Date of Patent: May 26, 2020Assignee: Hewlett-Packard Development Company, L.P.Inventors: David Sabo, Eric G. Nelson
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Publication number: 20200125001Abstract: A method of balancing current in a developer roller is described. The method comprises pulsing voltage to a squeegee roller and a cleaner roller. The pulsed voltage yields a differential voltage at the developer roller after impression. The method also comprises pulsing compensating voltage to at least one of the squeegee roller or the cleaner roller to reduce or cancel an accumulated developer current imbalance of the developer roller. The compensating voltage pulses comprise pulses before or after the impression.Type: ApplicationFiled: August 24, 2017Publication date: April 23, 2020Inventors: Guang Jin Li, Eric G. Nelson, Ido Finkelman
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Publication number: 20200064757Abstract: An example developer unit includes a developer roller. The developer unit also includes a set of electrodes proximate to the developer roller. The set of electrodes form a cavity. The developer unit includes an inlet to the cavity. The inlet is to receive printing fluid. The developer unit includes an insert in the inlet. The insert is to distribute the printing fluid evenly in the cavity.Type: ApplicationFiled: November 5, 2019Publication date: February 27, 2020Applicant: Hewlett-Packard Development Company, L.P.Inventors: David SABO, Eric G. NELSON
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Patent number: 10571830Abstract: In example implementations, an apparatus includes a planar surface, a curved mounting surface and a wiper blade. The curved mounting surface may be coupled adjacent to the planar surface. The wiper blade may be clamped to the planar surface. A bottom of the wiper blade can rest on the curved mounting surface such that a free length of the wiper blade is different at a plurality of points along a width of the wiper blade.Type: GrantFiled: May 3, 2019Date of Patent: February 25, 2020Assignee: HP Indigo B.V.Inventors: Eric G. Nelson, Lavi Cohen
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Patent number: 10545434Abstract: In an example, a method of wetting a print blanket includes receiving a null cycle trigger during a printing session. The method also includes maintaining printing voltages on a forecast BID (binary ink developer) that has been prepared to print a next color separation onto a photoreceptor, and applying wet null voltages to a non-forecast BID. The method then includes engaging the non-forecast BID with the photoreceptor to transfer fluid other than ink to the photoreceptor during the null cycle.Type: GrantFiled: January 13, 2019Date of Patent: January 28, 2020Assignee: HP Indigo B.V.Inventors: Vitaly Portnoy, Michel Assenheimer, Amiran Lavon, Eric G Nelson, Amir Ofir
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Patent number: 10474067Abstract: An example developer unit includes a developer roller. The developer unit also includes a set of electrodes proximate to the developer roller. The set of electrodes form a cavity. The developer unit includes an inlet to the cavity. The inlet is to receive printing fluid. The developer unit includes an insert in the inlet. The insert is to distribute the printing fluid evenly in the cavity.Type: GrantFiled: September 30, 2015Date of Patent: November 12, 2019Assignee: Hewlett-Packard Development Company, L.P.Inventors: David Sabo, Eric G. Nelson
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Publication number: 20190286015Abstract: Example implementations provide a method of controlling an ink developer used in electro-photography; the method comprising, following cessation of printing, varying a plurality of voltages associated with movement of ink within the ink developer at temporally disparate times.Type: ApplicationFiled: May 29, 2019Publication date: September 19, 2019Applicant: HP INDIGO B.V.Inventors: Eric G. Nelson, Yoav Nachmias, Vitaly Portnoy, Michel Assenheimer, Amiran Lavon
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Publication number: 20190258193Abstract: In example implementations, an apparatus includes a planar surface, a curved mounting surface and a wiper blade. The curved mounting surface may be coupled adjacent to the planar surface. The wiper blade may be clamped to the planar surface. A bottom of the wiper blade can rest on the curved mounting surface such that a free length of the wiper blade is different at a plurality of points along a width of the wiper blade.Type: ApplicationFiled: May 3, 2019Publication date: August 22, 2019Applicant: HP Indigo B.V.Inventors: Eric G. Nelson, Lavi Cohen
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Patent number: 10353320Abstract: Example implementations provide a method of controlling an ink developer used in electro-photography; the method comprising, following cessation of printing, varying a plurality of voltages associated with movement of ink within the ink developer at temporally disparate times.Type: GrantFiled: August 19, 2015Date of Patent: July 16, 2019Assignee: HP Indigo B.V.Inventors: Eric G. Nelson, Yoav Nachmias, Michel Assenheimer, Vitaly Portnoy, Amiran Lavon
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Patent number: 10310417Abstract: In example implementations, an apparatus includes a planar surface, a curved mounting surface and a wiper blade. The curved mounting surface may be coupled adjacent to the planar surface. The wiper blade may be clamped to the planar surface. A bottom of the wiper blade can rest on the curved mounting surface such that a free length of the wiper blade is different at a plurality of points along a width of the wiper blade.Type: GrantFiled: January 29, 2016Date of Patent: June 4, 2019Assignee: HP Indigo B.V.Inventors: Eric G. Nelson, Lavi Cohen