Patents by Inventor Lakshmi Channarayapatna

Lakshmi Channarayapatna 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).

  • Ink set for reducing printhead corrosion
    Patent number: 8939544
    Abstract: An ink set for an inkjet printer. The ink set includes an aqueous first ink comprising a first colorant and absent any potassium ions; and an aqueous second ink comprising a second colorant and potassium ions. The second aqueous ink comprises an AI(III) additive in an amount greater than the first ink.
    Type: Grant
    Filed: May 16, 2014
    Date of Patent: January 27, 2015
    Assignee: Memjet Technology Ltd.
    Inventors: Simon Fielder, Michele Gimona, Katja Johanna Digweed, Lakshmi Channarayapatna
  • INKJET PRINTER HAVING PRINTHEAD AND INK FOR MINIMIZING CORROSION OF EXPOSED CORRODIBLE STRUCTURES WITHIN PRINTHEAD
    Publication number: 20140253629
    Abstract: An inkjet printer includes: an inkjet printhead having an exposed corrodible structure containing silicon nitride, borophosphosilicate glass (BPSG) or silicon oxide; and an ink reservoir containing said ink which is in fluid communication with said printhead. The ink includes: water; a dye; and a metal additive for minimizing corrosion of the exposed structure.
    Type: Application
    Filed: May 16, 2014
    Publication date: September 11, 2014
    Inventors: Simon Fielder, Michele Gimona, Katja Johanna Digweed, Lakshmi Channarayapatna
  • Inkjet printer having printhead and ink for minimizing corrosion of exposed corrodible structures within printhead
    Patent number: 8757779
    Abstract: An inkjet printer includes: an inkjet printhead having an exposed corrodible structure containing silicon nitride, borophosphosilicate glass (BPSG) or silicon oxide; and an ink reservoir containing said ink which is in fluid communication with said printhead. The ink includes: water; a dye; and a metal additive for minimizing corrosion of the exposed structure.
    Type: Grant
    Filed: May 11, 2012
    Date of Patent: June 24, 2014
    Assignee: ZAMTEC Ltd
    Inventors: Simon Fielder, Michele Gimona, Katja Johanna Digweed, Lakshmi Channarayapatna
  • INKJET PRINTER HAVING PRINTHEAD AND INK FOR MINIMIZING CORROSION OF EXPOSED CORRODIBLE STRUCTURES WITHIN PRINTHEAD
    Publication number: 20120287206
    Abstract: An inkjet printer includes: an inkjet printhead having an exposed corrodible structure containing silicon nitride, borophosphosilicate glass (BPSG) or silicon oxide; and an ink reservoir containing said ink which is in fluid communication with said printhead. The ink includes: water; a dye; and a metal additive for minimizing corrosion of the exposed structure.
    Type: Application
    Filed: May 11, 2012
    Publication date: November 15, 2012
    Inventors: Simon Fielder, Michele Gimona, Katja Johanna Digweed, Lakshmi Channarayapatna
  • INKJET PRINTER HAVING PRINTHEAD AND INK FOR MINIMIZING CORROSION OF EXPOSED CORRODIBLE STRUCTURES WITHIN PRINTHEAD
    Publication number: 20120287207
    Abstract: An inkjet printer includes: an inkjet printhead having an exposed corrodible structure containing silicon nitride, borophosphosilicate glass (BPSG) or silicon oxide; and an ink reservoir containing said ink which is in fluid communication with said printhead. The ink includes: water; a dye; and a metal additive for minimizing corrosion of the exposed structure.
    Type: Application
    Filed: May 11, 2012
    Publication date: November 15, 2012
    Inventors: Simon Fielder, Michele Gimona, Katja Johanna Digweed, Lakshmi Channarayapatna
  • Inkjet printhead with titanium aluminium alloy heater
    Patent number: 8025367
    Abstract: An inkjet printhead with a resistive heaters for vaporizing ink to eject drops through respective nozzles. The heater is formed from a TiAlX alloy where Ti contributes more than 40% by weight, Al contributes more than 40% by weight and X contributes less than 5% by weight and comprises zero or more of Ag, Cr, Mo, Nb, Si, Ta and W.
    Type: Grant
    Filed: October 17, 2008
    Date of Patent: September 27, 2011
    Assignee: Silverbrook Research Pty Ltd
    Inventors: Angus John North, Jennifer Mia Fishburn, Lakshmi Channarayapatna
  • Printhead incorporating pressure pulse diffusing structures between ink chambers supplied by same ink inlet
    Patent number: 7980674
    Abstract: An inkjet printer includes a printhead having a plurality of ink chambers fed be an ink inlet, each ink chamber having a heater element for ejecting drops of ink from a nozzle aperture of each chamber; a plurality of pressure pulse diffusing structure positioned between the plurality of ink chambers fed by the ink inlet, the plurality of pressure pulse diffusing structures for retarding a propagation of pressure waves generated by each ink chamber to adjacent ink chambers; and a controller for receiving print data and generating drive pulses to energize the heater elements in accordance with the print data. The controller increases the drive pulse energy during the printhead lifetime such that the drive pulse energy is never less than that of a preceding drive pulse.
    Type: Grant
    Filed: January 31, 2011
    Date of Patent: July 19, 2011
    Assignee: Silverbrook Research Pty Ltd
    Inventors: Kia Silverbrook, Roger Mervyn Lloyd Foote, Angus John North, Jennifer Mia Fishburn, Paul David Lunsmann, Lakshmi Channarayapatna Shankar, Frederik Jacobus Crous, Matthew Stewart Walker, Samuel George Mallinson, Paul Justin Reichl