Patents by Inventor Frederick A. Donahue

Frederick A. Donahue 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).

  • Patent number: 8277006
    Abstract: A method of controlling in a printer the maintenance of an inkjet printhead supplied with fluid from a plurality of fluid sources, the method includes the steps of (a) monitoring the usage of the plurality of fluid sources; (b) identifying a preferred fluid source for use in a maintenance operation based on the monitored usage of the plurality of fluid sources; and (c) performing the maintenance operation using a first quantity of fluid from the preferred fluid source.
    Type: Grant
    Filed: February 24, 2010
    Date of Patent: October 2, 2012
    Assignee: Eastman Kodak Company
    Inventors: Frederick A. Donahue, Donald V. Brumbaugh, Gary A. Kneezel
  • Publication number: 20120081440
    Abstract: The present invention relates to a method that enables image quality of a printed image to be maintained by reducing unintended variations in drop volume, through the adjustment of ink drop ejecting conditions depending on the amount of ink remaining in an ink tank chamber or reservoir, and/or the ink demand for printing an image. The method of printing of the present invention comprises: providing a printhead in fluid communication with an ink chamber or reservoir; detecting at least one parameter related to an amount of negative pressure provided to the printhead; and adjusting an ink drop ejecting condition of the printhead as a function of the parameter so that an amount of variation in size of ejected ink drop is reduced.
    Type: Application
    Filed: December 13, 2011
    Publication date: April 5, 2012
    Inventors: GARY A. KNEEZEL, R. Winfield Trafton, Frederick A. Donahue
  • Patent number: 8136905
    Abstract: The present invention relates to a method that enables image quality of a printed image to be maintained by reducing unintended variations in drop volume, through the adjustment of ink drop ejecting conditions depending on the amount of ink remaining in an ink tank chamber or reservoir, and/or the ink demand for printing an image. The method of printing of the present invention comprises: providing a printhead in fluid communication with an ink chamber or reservoir; detecting at least one parameter related to an amount of negative pressure provided to the printhead; and adjusting an ink drop ejecting condition of the printhead as a function of the parameter so that an amount of variation in size of ejected ink drop is reduced.
    Type: Grant
    Filed: June 26, 2008
    Date of Patent: March 20, 2012
    Assignee: Eastman Kodak Company
    Inventors: Gary A. Kneezel, R. Winfield Trafton, Frederick A. Donahue
  • Publication number: 20110205292
    Abstract: A method of controlling a maintenance operation in an inkjet printer including an inkjet printhead supplied with fluid from a plurality of fluid sources, the method includes the steps of (a) monitoring the usage of the plurality of fluid sources; (b) identifying a first fluid source that is substantially empty; (c) identifying a second fluid source that is not substantially empty; and (d) performing the maintenance operation using a quantity of fluid from at least the second fluid source.
    Type: Application
    Filed: February 24, 2010
    Publication date: August 25, 2011
    Inventors: Gary A. Kneezel, Frederick A. Donahue
  • Publication number: 20110205263
    Abstract: A method of controlling in a printer the maintenance of an inkjet printhead supplied with fluid from a plurality of fluid sources, the method includes the steps of (a) monitoring the usage of the plurality of fluid sources; (b) identifying a preferred fluid source for use in a maintenance operation based on the monitored usage of the plurality of fluid sources; and (c) performing the maintenance operation using a first quantity of fluid from the preferred fluid source.
    Type: Application
    Filed: February 24, 2010
    Publication date: August 25, 2011
    Inventors: Frederick A. Donahue, Donald V. Brumbaugh, Gary A. Kneezel
  • Publication number: 20090322806
    Abstract: The present invention relates generally to the field of inkjet printing, and in particular to a method of printing that provides improved ink usage efficiency. In the method of the present invention a threshold level of ink in an ink chamber or reservoir is stored. The remaining amount of ink in the ink chamber or reservoir is monitored and compared to the threshold level. When the remaining amount of ink in the ink chamber or reservoir is below the threshold level, an ink throughput through the printhead for a printed image is reduced.
    Type: Application
    Filed: June 26, 2008
    Publication date: December 31, 2009
    Inventors: Frederick A. Donahue, R. Winfield Trafton, Gary A. Kneezel
  • Publication number: 20090322822
    Abstract: The present invention relates to a method that enables image quality of a printed image to be maintained by reducing unintended variations in drop volume, through the adjustment of ink drop ejecting conditions depending on the amount of ink remaining in an ink tank chamber or reservoir, and/or the ink demand for printing an image. The method of printing of the present invention comprises: providing a printhead in fluid communication with an ink chamber or reservoir; detecting at least one parameter related to an amount of negative pressure provided to the printhead; and adjusting an ink drop ejecting condition of the printhead as a function of the parameter so that an amount of variation in size of ejected ink drop is reduced.
    Type: Application
    Filed: June 26, 2008
    Publication date: December 31, 2009
    Inventors: Gary A. Kneezel, R. Winfield Trafton, Frederick A. Donahue
  • Patent number: 7030972
    Abstract: Method and system for detecting the presence and determining characteristics of objects such as ink cartridges in printing systems. The system includes a signal transceiver capable of transmitting signals using a photo emitter and capable of receiving signals sent from the objects using a photo detector, and a monitoring system coupled to the signal transceiver for processing received signals to determine characteristics of the objects. Further, the photo emitter is at least partially covered by a first optical polarizer and the objects include a reflective surface that is at least partially covered by a second optical polarizer. When signals are transmitted from the signal transceiver to the objects, the second optical polarizer allows the signals to reach the reflective surface and reflect back towards the signal transceiver if the orientations of the first and second optical polarizers are substantially the same.
    Type: Grant
    Filed: February 12, 2002
    Date of Patent: April 18, 2006
    Assignee: Xerox Corporation
    Inventors: Frederick A. Donahue, Eric A. Merz
  • Publication number: 20030151734
    Abstract: Method and system for detecting the presence and determining characteristics of objects such as ink cartridges in printing systems. The system includes a signal transceiver capable of transmitting signals using a photo emitter and capable of receiving signals sent from the objects using a photo detector, and a monitoring system coupled to the signal transceiver for processing received signals to determine characteristics of the objects. Further, the photo emitter is at least partially covered by a first optical polarizer and the objects include a reflective surface that is at least partially covered by a second optical polarizer. When signals are transmitted from the signal transceiver to the objects, the second optical polarizer allows the signals to reach the reflective surface and reflect back towards the signal transceiver if the orientations of the first and second optical polarizers are substantially the same.
    Type: Application
    Filed: February 12, 2002
    Publication date: August 14, 2003
    Applicant: Xerox Corporation
    Inventors: Frederick A. Donahue, Eric A. Merz
  • Patent number: 6578942
    Abstract: In the system of this application, a liquid crystal temperature sensor is applied to the exterior of the print head cartridge of a printing system to give an optical indication of the temperature at the print head that is readable by an optical scanner.
    Type: Grant
    Filed: April 10, 2002
    Date of Patent: June 17, 2003
    Assignee: Xerox Corporation
    Inventors: Richard H. Tuhro, Frederick A. Donahue
  • Patent number: 6494553
    Abstract: An ink jet printer that includes a printhead for ejecting ink droplets, an ink container for supplying ink to the printhead, and an ink level sensor for measuring the level of ink in the ink container, includes an ink level sensor activator. The ink level sensor activator causes the ink level sensor to measure the level of ink in the ink container after the printhead has ejected a predetermined quantity of ink. The ink level sensor activator records the quantity of ink ejected by the printhead onto the print medium by measuring to the number of droplets of ink ejected, and/or by determining the number of pixels in an image to be printed for which ink is to be ejected. If the quantity of ink ejected has a predetermined threshold, the ink level sensor measures the quantity of ink in the ink container.
    Type: Grant
    Filed: June 11, 2001
    Date of Patent: December 17, 2002
    Assignee: Xerox Corporation
    Inventors: Frederick A. Donahue, Richard E. Butts, Ronald C. Macera
  • Patent number: 6450712
    Abstract: A printer control apparatus and an algorithm for determining the peak instantaneous speed of a substrate through a thermal ink jet printer and a printer apparatus are disclosed herein. The printer includes a dryer module, a print head module, and a controller. The method includes determining the tolerable peak instantaneous speeds of the substrate through the print head and dryer modules, which by their sequential nature, operate out of phase from one another. The lower of the two speeds is then selected as the optimum instantaneous speed of the substrate through the printer. A controller in the printer carries out methods disclosed herein.
    Type: Grant
    Filed: January 29, 2001
    Date of Patent: September 17, 2002
    Assignee: Xerox Corporation
    Inventors: Dinesh S. Shah, Frederick A. Donahue, John F. Moreland, Thomas N. Taylor
  • Publication number: 20020102121
    Abstract: A printer control apparatus and an algorithm for determining the peak instantaneous speed of a substrate through a thermal ink jet printer and a printer apparatus are disclosed herein. The printer includes a dryer module, a print head module, and a controller. The method includes determining the tolerable peak instantaneous speeds of the substrate through the print head and dryer modules, which by their sequential nature, operate out of phase from one another. The lower of the two speeds is then selected as the optimum instantaneous speed of the substrate through the printer. A controller in the printer carries out methods disclosed herein.
    Type: Application
    Filed: January 29, 2001
    Publication date: August 1, 2002
    Inventors: Dinesh S. Shaw, Frederick A. Donahue, John F. Moreland, Thomas N. Taylor
  • Publication number: 20020063760
    Abstract: A system is provided for identifying an ink cartridge. The system includes an a printer having a main body. An ink cartridge is provided which includes radio frequency identification structure having an integrated circuit and antenna structure. A sensing structure is attached to the main body of the printer. The sensing structure is constructed and arranged to transmit a powering signal. The radio frequency identification structure is constructed and arranged to (1) receive the powering signal and to convert the powering signal to a voltage to power the integrated circuit and (2) transmit a radio frequency digital signal which identifies at least one characteristic of the ink cartridge for receipt by the sensing structure.
    Type: Application
    Filed: November 29, 2000
    Publication date: May 30, 2002
    Inventors: Steven J. Dietl, Frederick A. Donahue
  • Patent number: 6238046
    Abstract: A variable throughput active-passive dryer assembly is provided for handling and controllably drying wet sheets printed in a liquid ink printer.
    Type: Grant
    Filed: October 4, 1999
    Date of Patent: May 29, 2001
    Assignee: Xerox Corporation
    Inventor: Frederick A. Donahue
  • Patent number: 6176563
    Abstract: A method of replenishing fluid used in an marking device maintenance station of an ink marking device includes obtaining condensate from ambient air through a condensation process and channeling the condensate to a reservoir in communication with the marking device maintenance station.
    Type: Grant
    Filed: January 19, 1999
    Date of Patent: January 23, 2001
    Assignee: Xerox Corporation
    Inventors: David G. Anderson, Frederick A. Donahue, Leonard M. Carreira, Arthur M. Gooray
  • Patent number: 6174037
    Abstract: A liquid ink printer in which liquid ink is deposited on a recording medium in swaths in response to image data received thereby including a power supply, having a maximum power rating determined as a function of a number of passes per swath necessary to compete a swath having maximum ink coverage. The printer includes a print power regulation circuit, including a regulation circuit input, for receiving the image data, and a regulation circuit output, for transmitting image data in a number of passes per swath, the number of passes per swath being determined as a function of the maximum power rating, and a liquid ink printhead, coupled to the power supply and to the print power regulation circuit, for ejecting the liquid ink according to the transmitted image data.
    Type: Grant
    Filed: June 2, 1997
    Date of Patent: January 16, 2001
    Assignee: Xerox Corporation
    Inventors: Frederick A. Donahue, Donald M. Stevens
  • Patent number: 6158837
    Abstract: An ink jet printer of the type having at least one customer replaceable ink cartridge with an ink monitoring system detects whether or not the ink in the cartridge contains qualified ink or not and adjusts the normal printing mode to a non-normal printing when non-qualified ink is detected, thereby providing the customer the option to print with non-qualified ink with minimized effect on the printer or print quality.
    Type: Grant
    Filed: September 19, 1997
    Date of Patent: December 12, 2000
    Assignee: Xerox Corporation
    Inventors: Brian S. Hilton, Eric A. Merz, Frederick A. Donahue
  • Patent number: 6155669
    Abstract: A liquid ink printer, depositing liquid ink to form an image, on a recording medium, including a printing dimension defining a maximum print area to receive the liquid ink, moving along a recording medium path. The printer includes a printbar, including a plurality of nozzles, aligned substantially perpendicular to the recording medium path, to deposit a swath of ink on the recording medium during movement of the recording medium along the recording medium path, a recording medium transport, disposed adjacent the plurality of nozzles, to move the recording medium along the recording medium path, and an encoder system, spaced from the recording medium transport, to determine the position of the recording medium transport with respect to the array of nozzles. The printbar includes a mounting substrate to mount a plurality of printhead dies including the nozzles and an optical reader of the encoder system.
    Type: Grant
    Filed: January 8, 1998
    Date of Patent: December 5, 2000
    Assignee: Xerox Corporation
    Inventors: Frederick A. Donahue, David G. Anderson
  • Patent number: 6089693
    Abstract: A liquid ink printer, depositing ink drops to form an image, including a pagewidth printbar, movable to print a complete image when defective nozzles of the printbar are identified. A positioning device, coupled to the pagewidth printbar, positions the printbar at a plurality of discrete locations, to move a functioning nozzle to the location in the image where the defective nozzle should deposit drops of ink. Defective nozzles are identified by the printer control mechanism and a user is given the option to fix the image through a user interface where the printer is directed to fill in the missing information of the image. Defective nozzles can also be identified by printing a test pattern which identifies to a user which of the nozzles are non-functioning. The user then inputs this information to the printer.
    Type: Grant
    Filed: January 8, 1998
    Date of Patent: July 18, 2000
    Assignee: Xerox Corporation
    Inventors: Donald J. Drake, Frederick A. Donahue