Patents Assigned to Lexmark International, Inc.
  • Patent number: 10691062
    Abstract: A replaceable unit for use in an electrophotographic image forming device according to one example embodiment includes a photoconductor unit having a rotatable photoconductive drum and a developer unit having a rotatable developer roll that is positioned to supply toner to the photoconductive drum. An electrical contact is positioned to contact a corresponding electrical contact in the image forming device when the replaceable unit is installed in the image forming device. A spring mechanically biases the developer unit relative to the photoconductor unit applying a bias force on the developer roll toward the photoconductive drum. The spring is electrically conductive and forms a portion of an electrical path from the electrical contact of the replaceable unit to an imaging component of the replaceable unit for carrying voltage from the electrical contact of the replaceable unit to the imaging component of the replaceable unit.
    Type: Grant
    Filed: March 7, 2019
    Date of Patent: June 23, 2020
    Assignee: Lexmark International, Inc.
    Inventors: Mark William Amann, Brian Lester Boettcher, Gregory Alan Cavill, David Lee Merrifield
  • Patent number: 10691032
    Abstract: An improved organic photoconductor drum having a protective overcoat layer and method to make the same is provided. The protective overcoat layer is prepared from a curable composition including nano metal oxide particles sized less than 400 nm in combination with an urethane acrylate resin having at least 6 functional groups.
    Type: Grant
    Filed: November 3, 2017
    Date of Patent: June 23, 2020
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Weimei Luo, Mark Thomas Bellino
  • Patent number: 10684577
    Abstract: An imaging device has first image transfer from photoconductive drums to an intermediate transfer member (ITM) and second image transfer from the ITM to media. Transfer rolls oppose the drums from an opposite side of the ITM and electrically ground to a frame of the imaging device by mechanical connection. The rolls may be laterally offset from the drums. The ITM has relatively low surface and volume resistivity. An imaging subassembly may include the frame, the ITM, and the transfer rolls grounded to the frame.
    Type: Grant
    Filed: December 3, 2018
    Date of Patent: June 16, 2020
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Christopher Michael Bennett, Matthew David Heid, Gina Marie Johns, Michael Craig Leemhuis, Christopher David Strack
  • Patent number: 10684566
    Abstract: A method of preparing an organic photoconductor drum having a protective overcoat on its outermost surface is provided. In an example embodiment, a photoconductor drum having an electrically conductive substrate, a charge generation layer, a charge transport layer and an outermost protective overcoat layer is provided. The photoconductor drum is cured using a two-step process. The first curing step applies either ionizing irradiation, such as with an electron beam or by gamma rays or applies non-ionizing irradiation such as ultraviolet light to the photoconductor drum. A mask is sized and placed over the print area of the initially cured photoconductor drum, thereby exposing the outermost edges of the photoconductor drum. The outer edges of the masked photoconductor drum is then exposed to a second curing step using ultraviolet light irradiation.
    Type: Grant
    Filed: March 27, 2019
    Date of Patent: June 16, 2020
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Weimei Luo, Mark Thomas Bellino, Rudolph Wayne Hrobsky
  • Patent number: 10684565
    Abstract: An improved overcoat layer for an organic photoconductor drum used in an electrophotographic image forming device is provided. The overcoat layer is prepared from a curable composition including a charge transport molecule containing four radical polymerizable hydrophilic functional groups containing an oxygen atom of the general structure shown below: wherein R1 and R2 contain a spacer group and a radical polymerizable hydrophilic functional group containing an oxygen atom, R3 and R4 are a non-radical polymerizable functional group, and R5 and R6 contain a spacer group and a radical polymerizable hydrophilic functional group containing an oxygen atom. The curable composition may also contain at least one optional curing agent. This overcoat layer improves wear resistance of the organic photoconductor drum without negatively altering the electrophotographic properties, thus protecting the organic photoconductor drum from damage and extending its service life.
    Type: Grant
    Filed: July 31, 2018
    Date of Patent: June 16, 2020
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: David Glenn Black, Mark Thomas Bellino, Weimei Luo
  • Patent number: 10678153
    Abstract: An improved organic photoconductor drum having a protective overcoat layer and method to make the same is provided. The protective overcoat layer is prepared from a curable composition including nano metal oxide particles sized less than 400 nm in combination with an urethane acrylate resin having at least 6 functional groups.
    Type: Grant
    Filed: April 30, 2019
    Date of Patent: June 9, 2020
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Weimei Luo, Mark Thomas Bellino
  • Patent number: 10663891
    Abstract: A color imaging device includes a plurality of developer rolls with a common operating point, such as a common operating voltage. To determine the operating point, an acceptable range of color density is determined for each toner, the range being lighter and darker than an optimum color density for that toner. A search range is devised such that values within the range are examined relative to deviations from the optimum color density per each toner. The common operating point is selected as that having the lowest deviation per all toners. Also, if the common operating point corresponds to a color density darker than the acceptable range of color density for any toner, additional halftoning occurs compared to traditional halftoning, such as for continuous tones or solids. In this way, four color developer rolls can be operated from a single power supply, yet still provide acceptable color images.
    Type: Grant
    Filed: May 28, 2019
    Date of Patent: May 26, 2020
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Marc Cousoulis, Gary Scott Overall
  • Patent number: 10656592
    Abstract: A toner cartridge according to one example embodiment includes a first positioning slot positioned on a first side of a housing of the toner cartridge for receiving a first corresponding positioning rib in an image forming device for defining an axial position of a photoconductive drum relative to the image forming device when the toner cartridge is installed in the image forming device. A second positioning slot is positioned on a second side of the housing for receiving a second corresponding positioning rib in the image forming device for defining an axial position of a developer roll relative to the image forming device when the toner cartridge is installed in the image forming device. The first and second positioning slots extend upward from a bottom of the housing near a longitudinal end of the housing.
    Type: Grant
    Filed: January 9, 2019
    Date of Patent: May 19, 2020
    Assignee: Lexmark International, Inc.
    Inventors: Mark William Amann, Brian Lester Boettcher, David Lee Merrifield
  • Patent number: 10656559
    Abstract: A toner cartridge according to one example embodiment includes a housing having a toner reservoir. An outlet port faces downward on a front of the housing near a first side of the housing. A linkage is positioned on the first side of the housing and has an engagement surface that is accessible at the rear of the housing. A projection is positioned on the first side of the housing and is movable between a first position and a second position. The projection is operatively connected to the linkage such that the projection moves upward from the first position to the second position when the engagement surface receives a forward force that is toward the front of the housing. The projection extends outward sideways from the first side when the projection is in the second position.
    Type: Grant
    Filed: December 20, 2018
    Date of Patent: May 19, 2020
    Assignee: Lexmark International, Inc.
    Inventors: Michael Nuestro Bayubay, Salvador Capurihan Bonanciar, Brian Scott Carpenter, Donato Austria Marmol, Robert Watson McAlpine, Katrina Rosit Lactuan
  • Patent number: 10659647
    Abstract: An imaging device and a method of processing a document at the imaging device which includes receiving a message associated with the document, transmitting the message to a server communicatively connected to the imaging device, receiving an identifier of the message as stored in the server, converting the identifier to an image scannable by a mobile device, and adding the image to an output page of the document. An input language and an output language of the message associated with the document may be predetermined or may be received from a user of the imaging device.
    Type: Grant
    Filed: December 20, 2018
    Date of Patent: May 19, 2020
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventor: Neal Fredrick Vittitoe
  • Patent number: 10659649
    Abstract: A toner container installable in an image forming device having a controller according to one example embodiment includes a housing having a reservoir for storing toner. A chip is positioned on the housing and configured to receive a first write command from the controller of the image forming device. The chip is further configured to determine whether a transmission cycle bit of the first write command matches a transmission cycle bit of a second write command received by the chip from the controller of the image forming device previous to the first write command. The chip is further configured to resend to the controller of the image forming device a response to the second write command if the transmission cycle bit of the first write command matches the transmission cycle bit of the second write command.
    Type: Grant
    Filed: April 12, 2018
    Date of Patent: May 19, 2020
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Nathan Wayne Foley, Jennifer Topmiller Williams, Gregory Scott Woods, Jimmy Daniel Moore, Jr.
  • Patent number: 10649702
    Abstract: A toner container installable in an image forming device having a controller according to one example embodiment includes a housing having a reservoir for storing toner. A chip is positioned on the housing and configured to, after sending a first busy response to the controller of the image forming device, receive a second write command from the controller of the image forming device that is abbreviated relative to a first write command received from the controller of the image forming device and that requests the chip to send a response to the first write command. The chip is further configured to send a response to the first write command to the controller of the image forming device if upon receiving a read command corresponding to the second write command the chip has completed processing the first write command.
    Type: Grant
    Filed: April 12, 2018
    Date of Patent: May 12, 2020
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Nathan Wayne Foley, Jennifer Topmiller Williams, Gregory Scott Woods, Jimmy Daniel Moore, Jr.
  • Patent number: 10649389
    Abstract: An assembly for an image forming device includes a first replaceable unit and a second replaceable unit matable with the first replaceable unit. One of the first and second replaceable units includes a reservoir for storing toner and the other of the first and second replaceable units is configured to receive toner from the one of the first and second replaceable units. An electrical connector on the first replaceable unit is movable between a retracted position and an operative position. The electrical connector on the first replaceable unit includes an electrical contact for contacting a corresponding electrical contact in the image forming device when the electrical connector is in the operative position. A cam on the second replaceable unit is positioned to engage the electrical connector and to cause the electrical connector to move from the retracted position to the operative position when the first and second replaceable units mate.
    Type: Grant
    Filed: April 12, 2019
    Date of Patent: May 12, 2020
    Assignee: Lexmark International, Inc.
    Inventors: Brian Scott Carpenter, Gregory Alan Cavill, James Richard Leemhuis
  • Patent number: 10649401
    Abstract: A toner cartridge according to one embodiment includes a housing having first and second alignment guides that extend outward from a first side and a second side of the housing, respectively, and that run along a front-to-rear dimension of the housing. Third and fourth alignment guides extend outward from the first side of the housing. The third alignment guide is spaced toward the front of the housing from the fourth alignment guide. Bottom surfaces of the third and fourth alignment guides are unobstructed to sit on top of a corresponding guide surface in an image forming device to control a vertical position of the toner cartridge in the image forming device. The bottom surfaces of the third and fourth alignment guides are aligned with each other in a vertical dimension of the housing and are positioned higher than the first and second alignment guides.
    Type: Grant
    Filed: January 21, 2019
    Date of Patent: May 12, 2020
    Assignee: Lexmark International, Inc.
    Inventors: Jason Paul Hale, Kyle Bradley Martin, Jeremy Keith Payne, Matthew Lee Rogers, Edward Lynn Triplett
  • Patent number: 10625962
    Abstract: Separation strips in a dam aid in the separation of adjacent sheets of media being fed from a stack of sheets so that only one sheet is fed to a process station and, more particularly, to separating the uppermost or top sheet of a stack of sheets from the next adjacent sheet during feeding of the top sheet from the stack of sheets of media. When a lift plate is present that adjusts the height of the media stack, rotation of the separation strips to maintain a constant separation angle improves media feed reliability. Curvature of the separation strips may also maintain the separation angle as the lift plate raises the position of the top media sheet.
    Type: Grant
    Filed: July 18, 2018
    Date of Patent: April 21, 2020
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Angel Macuha Alagos, Edmund Hulin James, III, Stacey Vaughan Mitchell, Chad Michael Piening, Louann Behymer Samuels, Curtis Duane Woodson
  • Patent number: 10620555
    Abstract: A method of curing a protective overcoat layer on the outermost portion of an organic photoconductor drum using dual curing process is provided. The first curing step applies either ionizing irradiation, such as with an electron beam or by gamma rays or applies non-ionizing irradiation such as ultraviolet light to the overcoated photoconductor drum. A mask or shield is sized to be placed over the print area of the initially cured photoconductor drum, thereby exposing the outermost edges of the photoconductor drum. The outer edges of the masked photoconductor drum is then exposed to a second curing step using non-ionizing irradiation such as ultraviolet light.
    Type: Grant
    Filed: March 27, 2019
    Date of Patent: April 14, 2020
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Weimei Luo, Mark Thomas Bellino, Rudolph Wayne Hrobsky
  • Patent number: 10613450
    Abstract: The present disclosure relates generally to a method to make a chemically prepared toner that employs a crash cooling process. In particular, the crash cooling process involves the addition of a toner slurry having a temperature between 70° C. and 90° C. to an equivalent amount of cold water having a temperature between 5° C. and 20° C. Polyester and styrene acrylic toners as well as polyester core shell toners having a borax coupling agent between the toner core and toner shell made from this cooling process results in an improvement to the amount of toner waste, thereby achieving a higher toner usage efficiency for an electrophotographic printing system.
    Type: Grant
    Filed: April 3, 2019
    Date of Patent: April 7, 2020
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Kasturi Rangan Srinivasan, Rahel Bekru Bogale, Trent Duane Peter, Brian David Munson
  • Patent number: 10606182
    Abstract: The present disclosure relates generally to a method to make a chemically prepared toner that employs a crash cooling process. In the crash cooling process, hot toner slurry is added to an external reactor containing a coolant comprised of previously cooled toner slurry in combination with cooled de-ionized water. The previously cooled toner slurry found in the coolant has the same toner composition as the incoming hot toner slurry. Also, the amount of the coolant in the external reactor is equivalent to the amount of incoming hot toner slurry. Polyester toners and polyester core shell toners having a borax coupling agent between the toner core and toner shell made from this crash cooling process results in an improvement to the toner performance especially a decrease in the overall toner usage.
    Type: Grant
    Filed: April 16, 2019
    Date of Patent: March 31, 2020
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Kasturi Rangan Srinivasan, Anna Sara McLeland, Rahel Bekru Bogale
  • Patent number: 10606199
    Abstract: An image forming device includes a controller and a power supply unit in communication with the controller. The power supply unit includes a voltage converter for supplying voltage to a component of the image forming device. A memory unit on the voltage converter stores characterization data specific to the voltage converter having been characterized during production of the power supply unit and defining a predefined voltage response characteristic of the voltage converter. The controller is configured to selectively adjust a voltage response of the voltage converter to deviate away from the predefined voltage response characteristic based on a detected error condition relating to a replaceable unit installed in the image forming device. When the error condition has been corrected, the controller is configured to adjust the voltage response of the voltage converter to the predefined voltage response characteristic.
    Type: Grant
    Filed: September 19, 2018
    Date of Patent: March 31, 2020
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventor: Don Dexter A. Antonio
  • Patent number: D881987
    Type: Grant
    Filed: May 2, 2018
    Date of Patent: April 21, 2020
    Assignee: Lexmark International, Inc.
    Inventors: Thomas Eugene Pangburn, Steven David Sieckowski, Zachary Gaylord Wiles, Jeffrey Allen Hendren