Patents Assigned to Lexmark International, Inc.
  • 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: 10606181
    Abstract: The toner composition of the present invention and method to make the same includes toner particles mixed with a specific set of extra particulate additives including large colloidal silica sized 90 nm to 120 nm and having a conductivity of less than 20 ?s/cm in combination with medium size silica particles sized 30 nm to 60 nm. Optionally, additional extra particular additives such as silica sized 2 nm to 20 nm, alumina, titania or mixtures thereof can be used. The finished toner having these specific additives exhibited superior printing performance.
    Type: Grant
    Filed: December 27, 2013
    Date of Patent: March 31, 2020
    Assignee: Lexmark International, Inc.
    Inventors: Kasturi Rangan Srinivasan, Rick Owen Jones, Courtney Harrison Soale, Devon Jean Vaccaro Strain, Ligia Aura Bejat
  • Patent number: 10606196
    Abstract: A fuser assembly includes a heated member and a backup member defining a fusing nip. Toner fuses to media in the nip at a fusing temperature and process speed during an imaging operation. Upon receipt of a command to commence imaging, a controller operates a heater to heat the fuser assembly to a first temperature less than the fusing temperature and operates a motor to rotate the fuser assembly at a speed lower than the process speed to prevent overheating the heated and backup members. Before a first media reaches the fusing nip, a speed of the motor is increased to the process speed to properly advance the media through the nip at the process speed. Upon the first media arriving at the fusing nip, the controller increases the temperature of the heater to a second temperature greater than the first temperature to prevent cold offset.
    Type: Grant
    Filed: April 11, 2019
    Date of Patent: March 31, 2020
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Jichang Cao, Douglas Campbell Hamilton, Benjamin Karnik Johnson
  • 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: 10591832
    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 17, 2020
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Kasturi Rangan Srinivasan, Anna Sara McLeland, Rahel Bekru Bogale
  • Patent number: 10591831
    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 17, 2020
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Kasturi Rangan Srinivasan, Anna Sara McLeland, Rahel Bekru Bogale
  • Patent number: 10591846
    Abstract: A replaceable unit for an electrophotographic image forming device according to one example embodiment includes a housing having a reservoir for storing toner. A rotatable shaft is positioned within the reservoir and has an axis of rotation. A first magnet and a second magnet are connected to the shaft and rotatable around the axis of rotation in response to rotation of the shaft. The first magnet and the second magnet are detectable by a magnetic sensor when the replaceable unit is installed in the image forming device. A polarity of the first magnet is oriented opposite a polarity of the second magnet relative to the shaft. An amount of angular offset between the first magnet and the second magnet varies depending on an amount of toner in the reservoir.
    Type: Grant
    Filed: April 27, 2018
    Date of Patent: March 17, 2020
    Assignee: Lexmark International, Inc.
    Inventors: Brian Scott Carpenter, Michael Craig Leemhuis, Robert Watson McAlpine
  • Patent number: 10591834
    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, an amount of hot toner slurry is added to an external reactor holding an amount of chilled cooling water, wherein the temperature of the chilled cooling water in the external reactor is from about 8° C. to about 25° C. The amount of the chilled cooling water in the external reactor is about 10% to about 40% lower compared to the amount of the added hot toner slurry. Toner prepared using this crash cooling method is cooled at a rate of less than 0.8° C./min. Polyester toners and polyester core shell toners having a borax coupling agent between the toner core and toner shell made from this crash cooling processes using less water results in an improvement to the toner's print density and usage efficiency.
    Type: Grant
    Filed: April 16, 2019
    Date of Patent: March 17, 2020
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Kasturi Rangan Srinivasan, Anna Sara McLeland, Rahel Bekru Bogale, Trent Duane Peter
  • Patent number: 10591862
    Abstract: An imaging system having methods for reducing churn in an imaging device which includes identifying a number of unproductive revolutions made in a print engine of the imaging device, determining whether the number of unproductive revolutions exceeds a predetermined threshold, and performing at least one of: using a predetermined speed limit when printing a page and disabling a function in the imaging device upon the determination that the number of unproductive revolutions exceeds the predetermined threshold.
    Type: Grant
    Filed: January 15, 2019
    Date of Patent: March 17, 2020
    Assignee: LEXMARK INTERNATIONAL, INC
    Inventors: Douglas Anthony Able, Kevin Dean Schoedinger
  • Patent number: 10591833
    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, an amount of hot toner slurry is added to an external reactor holding an amount of chilled cooling water, wherein the temperature of the chilled cooling water in the external reactor is from about 8° C. to about 25° C. The amount of the chilled cooling water in the external reactor is about 10% to about 40% lower compared to the amount of the added hot toner slurry. Toner prepared using this crash cooling method is cooled at a rate of less than 0.8° C./min. Polyester toners and polyester core shell toners having a borax coupling agent between the toner core and toner shell made from this crash cooling processes using less water results in an improvement to the toner's print density and usage efficiency.
    Type: Grant
    Filed: April 16, 2019
    Date of Patent: March 17, 2020
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Kasturi Rangan Srinivasan, Anna Sara McLeland, Rahel Bekru Bogale, Trent Duane Peter
  • Patent number: 10591835
    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, an amount of hot toner slurry is added to an external reactor holding an amount of chilled cooling water, wherein the temperature of the chilled cooling water in the external reactor is from about 8° C. to about 25° C. The amount of the chilled cooling water in the external reactor is about 10% to about 40% lower compared to the amount of the added hot toner slurry. Toner prepared using this crash cooling method is cooled at a rate of less than 0.8° C./min. Polyester toners and polyester core shell toners having a borax coupling agent between the toner core and toner shell made from this crash cooling processes using less water results in an improvement to the toner's print density and usage efficiency.
    Type: Grant
    Filed: April 16, 2019
    Date of Patent: March 17, 2020
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Kasturi Rangan Srinivasan, Anna Sara McLeland, Rahel Bekru Bogale, Trent Duane Peter
  • Patent number: 10579003
    Abstract: An imaging device includes a photoconductive drum charged by a charge roll and opposed by a transfer roll to transfer an image from the drum. The drum becomes biased to a negative voltage by setting charges of negative voltage on both the charge roll and transfer roll. A controller switches the bias of the transfer roll to a positive voltage from the negative voltage and a delta or difference in a charge of the drum is determined from before and after the switching. Based on the delta, the voltage on the charge roll is boosted by a boost voltage to improve the charge on the drum. In this way, deteriorating or defective charge rolls can be still used to charge the drum to a proper voltage for imaging. Techniques for determining the delta, the boost and the magnitude of voltage charges are further embodiments.
    Type: Grant
    Filed: May 21, 2019
    Date of Patent: March 3, 2020
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Michael Brian Bacelieri, Douglas Anthony Able, Andrew Pryse Dale, Jared Kuohui Lin, Robert Watson McAlpine, Matthew Russell Smither
  • Patent number: 10571818
    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: December 19, 2018
    Date of Patent: February 25, 2020
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Weimei Luo, Mark Thomas Bellino, Rudolph Wayne Hrobsky
  • Patent number: 10571817
    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: December 19, 2018
    Date of Patent: February 25, 2020
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Weimei Luo, Mark Thomas Bellino, Rudolph Wayne Hrobsky
  • Patent number: 10566296
    Abstract: In the invention described, magnetic field characteristics of randomly placed magnetized particles are exploited by using the magnetic field fluctuations produced by the particles as measured by a sensor. The magnetized particles generate a complex magnetic field near the surface of an integrated circuit chip on a bank card or identification card that can be used as a “fingerprint.” The positioning and orientation of the magnetized particles is an uncontrolled process, and thus the interaction between the sensor and the particles is complex. The randomness of the magnetic field magnitude and direction near the surface of the material containing the magnetic particles can be used to obtain a unique identifier for an item such as an integrated circuit chip on a bank card or identification card carrying the PUF.
    Type: Grant
    Filed: November 10, 2017
    Date of Patent: February 18, 2020
    Assignee: Lexmark International, Inc.
    Inventors: Roger Steven Cannon, William Corbett, Gary A. Denton, James Paul Drummond, Kelly Ann Killeen, Carl E. Sullivan
  • 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