Patents by Inventor Kristi Maggard Rowe
Kristi Maggard Rowe 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: 7922297Abstract: A silicon chip has a plurality of ink jetting structures. Each ink jetting structure of the plurality of ink jetting structures includes a heater stack having an electrical heater element. A power transistor is electrically connected to the electrical heater element. A planarization layer is interposed between the power transistor and the heater stack. The planarization layer has a planar base surface on which the heater stack is formed.Type: GrantFiled: December 18, 2007Date of Patent: April 12, 2011Assignee: Lexmark International, Inc.Inventors: Yimin Guan, Kristi Maggard Rowe, Timothy Lowell Strunk, Carl Edmond Sullivan
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Publication number: 20100123758Abstract: A micro-fluid ejection device, such as an inkjet printhead, includes a substrate, a heater chip on the substrate, a structure on the substrate for supplying ink to the heater chip and a nozzle plate on the heater chip. The heater chip has a plurality of electrically-activatable spaced apart heater elements that can be repetitively subjected to momentary electrical activation and deactivation so as to cause cyclical heating and cooling of ink in the heater chip resulting in repetitive ejection of drops of ink by the nozzle plate on the heater chip. The device also includes a thermal control system in the heater chip being self-managed by operation of a control loop defined by the thermal control system internally of the heater chip and substrate for sensing and limiting the variation of the temperature of the substrate during cyclical operation of the heater elements of the heater chip.Type: ApplicationFiled: November 14, 2008Publication date: May 20, 2010Inventors: Steven Wayne Bergstedt, John Glenn Edelen, George Keith Parish, Kristi Maggard Rowe
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Publication number: 20090153622Abstract: A silicon chip has a plurality of inkjetting structures. Each ink jetting structure of the plurality of ink jetting structures includes a heater stack having an electrical heater element. A power transistor is electrically connected to the electrical heater element. A planarization layer is interposed between the power transistor and the heater stack. The planarization layer has a planar base surface on which the heater stack is formed.Type: ApplicationFiled: December 18, 2007Publication date: June 18, 2009Inventors: Yimin Guan, Kristi Maggard Rowe, Timothy Lowell Strunk, Carl Edmond Sullivan
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Patent number: 7452041Abstract: A method for generating a clock pulse train within a heater chip of an ink jet printer that is used to serially load data into the chip eliminates the need for an externally generated clock signal. These heater chips with internally generated clock signals allow for reduced print head cost.Type: GrantFiled: August 7, 2003Date of Patent: November 18, 2008Assignee: Lexmark International, Inc.Inventors: John Glenn Edelen, Kristi Maggard Rowe
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Patent number: 7244015Abstract: An inkjet printhead heater chip has an ink via asymmetrically arranged in a reciprocating direction of inkjet printhead movement. The ink via has two sides and a longitudinal extent substantially parallel to a print medium advance direction. A column of fluid firing elements exists exclusively along a single side of the two sides. The heater chip and ink via each have a centroid and neither resides coincidentally with one another. Preferably, the heater chip centroid resides externally to a boundary of the ink via. In other aspects, the column of fluid firing elements can be a sole column or plural and may be centered in the reciprocating direction. The ink via can be a sole via or plural. The heater chip can be rectangular and the ink vias can be closer to either the long or short ends thereof. Inkjet printers for housing the printheads are also disclosed.Type: GrantFiled: November 8, 2005Date of Patent: July 17, 2007Assignee: Lexmark International, Inc.Inventors: George Keith Parish, Kristi Maggard Rowe
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Patent number: 7083266Abstract: A micro-miniature fluid ejecting device. The fluid ejecting device includes a semiconductor substrate having fluid ejectors formed on a surface of the substrate. A flexible circuit is fixedly attached to the semiconductor substrate. The flexible circuit has power contacts for providing power to the fluid ejectors. At least one drive circuit is connected to the fluid ejectors. The drive circuit is disposed on one of the semiconductor substrate and the flexible circuit. A fluid sequencer is connected to the drive circuit for selectively activating the fluid ejectors. The fluid sequencer is also disposed on one of the semiconductor substrate and the flexible circuit. The semiconductor substrate is attached to a housing. A fluid source is provided for supplying fluid to the semiconductor substrate for ejection by the fluid ejectors. The fluid ejecting device provides low cost construction for application specific miniature fluid jetting devices.Type: GrantFiled: October 30, 2002Date of Patent: August 1, 2006Assignee: Lexmark International, Inc.Inventors: Adam Jude Ahne, John Douglas Anderson, Stephen Andrew Budelsky, Mark Joseph Edwards, Randall David Mayo, George Keith Parish, Kristi Maggard Rowe, David Craig Stevenson
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Patent number: 7077509Abstract: An inkjet printhead heater chip has an ink via asymmetrically arranged in a reciprocating direction of inkjet printhead movement. The ink via has two sides and a longitudinal extent substantially parallel to a print medium advance direction. A column of fluid firing elements exists exclusively along a single side of the two sides. The heater chip and ink via each have a centroid and neither resides coincidentally with one another. Preferably, the heater chip centroid resides externally to a boundary of the ink via. In other aspects, the column of fluid firing elements can be a sole column or plural and may be centered in the reciprocating direction. The ink via can be a sole via or plural. The heater chip can be rectangular and the ink vias can be closer to either the long or short ends thereof. Inkjet printers for housing the printheads are also disclosed.Type: GrantFiled: September 22, 2004Date of Patent: July 18, 2006Assignee: Lexmark International, Inc.Inventors: George Keith Parish, Kristi Maggard Rowe
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Patent number: 7025440Abstract: A low-profile ink jet cartridge assembly for an ink jet printer. The low profile ink jet cartridge assembly includes a substantially rectangular ink jet cartridge body having a printhead side, opposing side surfaces attached to the printhead side and a length, a height, and a width, wherein the length is greater than the height and the width. A printhead containing a semiconductor substrate is attached to the printhead side of the ink cartridge. A flexible circuit having a width, a length, a first edge along the length thereof, a second edge along the length thereof, first printer contact pads along at least a portion of the length thereof adjacent the first edge, and second printer contact pads along at least a portion of the length thereof adjacent the second edge is attached to the ink cartridge on the opposing side surfaces of the cartridge body.Type: GrantFiled: October 15, 2003Date of Patent: April 11, 2006Assignee: Lexmark International, Inc.Inventors: Paul William Graf, John Richard Fowler, Kristi Maggard Rowe, Timothy Lorn Howard, Matthew Joe Russell, Paul Timothy Spivey, Frank Edward Anderson
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Patent number: 7014299Abstract: An inkjet printhead heater chip has an ink via asymmetrically arranged in a reciprocating direction of inkjet printhead movement. The ink via has two sides and a longitudinal extent substantially parallel to a print medium advance direction. A column of fluid firing elements exists exclusively along a single side of the two sides. The heater chip and ink via each have a centroid and neither resides coincidentally with one another. Preferably, the heater chip centroid resides externally to a boundary of the ink via. In other aspects, the column of fluid firing elements can be a sole column or plural and may be centered in the reciprocating direction. The ink via can be a sole via or plural. The heater chip can be rectangular and the ink vias can be closer to either the long or short ends thereof. Inkjet printers for housing the printheads are also disclosed.Type: GrantFiled: September 22, 2004Date of Patent: March 21, 2006Assignee: Lexmark International, Inc.Inventors: George Keith Parish, Kristi Maggard Rowe
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Patent number: 6976752Abstract: An ink jet printer includes a printhead control circuit that produces printhead command signals based on data signals provided by the printer. A power circuit actuates ink ejectors in response to the printhead command signals and includes a plurality of compensation circuits. Each ink ejector is associated with a single compensation circuit and each compensation circuit includes a number of switches connected in parallel with each other. Each switch in a single compensation circuit is connected to actuate a single ink ejector when the switch is turned on. The compensation circuits adjust their internal resistance by turning on more or less switches and thereby compensate for changing effective parasitic resistance of the power lines.Type: GrantFiled: October 28, 2003Date of Patent: December 20, 2005Assignee: Lexmark International, Inc.Inventors: George Keith Parish, Kristi Maggard Rowe, John Glenn Edelen
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Patent number: 6913345Abstract: A method of firing a plurality of jetting heaters in an ink jet printer includes identifying a first of the jetting heaters to be fired. A second of the jetting heaters to be fired immediately after the firing of the first jetting heater is also identified. Power is simultaneously applied to each of the first jetting heater and the second jetting heater.Type: GrantFiled: March 21, 2003Date of Patent: July 5, 2005Assignee: Lexmark International, Inc.Inventors: George Keith Parish, Kristi Maggard Rowe
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Patent number: 6890066Abstract: An inkjet printer includes a printhead for ejecting ink onto a print medium. The printhead includes electrical and mechanical structure for controlling the ejection of the ink. The printhead includes an ink ejector chip having at least one active device, such as a transistor and the like. A guard ring substantially surrounds select active devices included on the chip. The guard ring tends to prevent latch-up when the chip operates to energize the ink. The chip is manufactured using a substrate devoid of an overlying epitaxial layer which tends to reduce the cost of manufacturing the chip.Type: GrantFiled: May 22, 2003Date of Patent: May 10, 2005Assignee: Lexmark International, Inc.Inventors: George Keith Parish, Kristi Maggard Rowe, John Glenn Edelen
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Patent number: 6863381Abstract: An inkjet printhead heater chip has an ink via asymmetrically arranged in a reciprocating direction of inkjet printhead movement. The ink via has two sides and a longitudinal extent substantially parallel to a print medium advance direction. A column of fluid firing elements exists exclusively along a single side of the two sides. The heater chip and ink via each have a centroid and neither resides coincidentally with one another. Preferably, the heater chip centroid resides externally to a boundary of the ink via. In other aspects, the column of fluid firing elements can be a sole column or plural and may be centered in the reciprocating direction. The ink via can be a sole via or plural. The heater chip can be rectangular and the ink vias can be closer to either the long or short ends thereof. Inkjet printers for housing the printheads are also disclosed.Type: GrantFiled: December 30, 2002Date of Patent: March 8, 2005Assignee: Lexmark International, Inc.Inventors: George Keith Parish, Kristi Maggard Rowe
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Publication number: 20040233255Abstract: An inkjet printer includes a printhead for ejecting ink onto a print medium. The printhead includes electrical and mechanical structure for controlling the ejection of the ink. The printhead includes an ink ejector chip having at least one active device, such as a transistor and the like. A guard ring substantially surrounds select active devices included on the chip. The guard ring tends to prevent latch-up when the chip operates to energize the ink. The chip is manufactured using a substrate devoid of an overlying epitaxial layer which tends to reduce the cost of manufacturing the chip.Type: ApplicationFiled: May 22, 2003Publication date: November 25, 2004Inventors: George Keith Parish, Kristi Maggard Rowe, John Glenn Edelen
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Publication number: 20040183861Abstract: A method of firing a plurality of jetting heaters in an ink jet printer includes identifying a first of the jetting heaters to be fired. A second of the jetting heaters to be fired immediately after the firing of the first jetting heater is also identified. Power is simultaneously applied to each of the first jetting heater and the second jetting heater.Type: ApplicationFiled: March 21, 2003Publication date: September 23, 2004Inventors: George Keith Parish, Kristi Maggard Rowe
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Patent number: 6789871Abstract: An inkjet printhead heater chip has an integral voltage regulator that derives two output voltages from a single chip input voltage. One of the two output voltages powers control logic circuitry as the other powers FET drivers. Preferred output voltages include +3.3 volts for the control logic circuitry and +7.5 volts for the FET drivers. A Vgs of the FET is about +7.5 volts which enables a FET area width of about 400 microns. Outputs of the control logic circuitry provide input to the FET drivers. A resistive heater for ejecting ink couples between a drain of the FET and the chip input voltage. Voltage regulating capacitors exist on the heater chip in parallel with the input voltage and each of the output voltages. Preferred capacitors have a gate oxide and a polysilicon layer overlying a substrate. Inkjet printers for housing the printheads are also disclosed.Type: GrantFiled: December 27, 2002Date of Patent: September 14, 2004Assignee: Lexmark International, Inc.Inventors: John Glenn Edelen, George Keith Parish, Kristi Maggard Rowe
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Publication number: 20040125173Abstract: An inkjet printhead heater chip has an ink via asymmetrically arranged in a reciprocating direction of inkjet printhead movement. The ink via has two sides and a longitudinal extent substantially parallel to a print medium advance direction. A column of fluid firing elements exists exclusively along a single side of the two sides. The heater chip and ink via each have a centroid and neither resides coincidentally with one another. Preferably, the heater chip centroid resides externally to a boundary of the ink via. In other aspects, the column of fluid firing elements can be a sole column or plural and may be centered in the reciprocating direction. The ink via can be a sole via or plural. The heater chip can be rectangular and the ink vias can be closer to either the long or short ends thereof. Inkjet printers for housing the printheads are also disclosed.Type: ApplicationFiled: December 30, 2002Publication date: July 1, 2004Inventors: George Keith Parish, Kristi Maggard Rowe
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Publication number: 20040125157Abstract: An inkjet printhead heater chip has an integral voltage regulator that derives two output voltages from a single chip input voltage. One of the two output voltages powers control logic circuitry as the other powers FET drivers. Preferred output voltages include +3.3 volts for the control logic circuitry and +7.5 volts for the FET drivers. A Vgs of the FET is about +7.5 volts which enables a FET area width of about 400 microns. Outputs of the control logic circuitry provide input to the FET drivers. A resistive heater for ejecting ink couples between a drain of the FET and the chip input voltage. Voltage regulating capacitors exist on the heater chip in parallel with the input voltage and each of the output voltages. Preferred capacitors have a gate oxide and a polysilicon layer overlying a substrate. Inkjet printers for housing the printheads are also disclosed.Type: ApplicationFiled: December 27, 2002Publication date: July 1, 2004Inventors: John Glenn Edelen, George Keith Parish, Kristi Maggard Rowe
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Publication number: 20040085399Abstract: A micro-miniature fluid ejecting device. The fluid ejecting device includes a semiconductor substrate having fluid ejectors formed on a surface of the substrate. A flexible circuit is fixedly attached to the semiconductor substrate. The flexible circuit has power contacts for providing power to the fluid ejectors. At least one drive circuit is connected to the fluid ejectors. The drive circuit is disposed on one of the semiconductor substrate and the flexible circuit. A fluid sequencer is connected to the drive circuit for selectively activating the fluid ejectors. The fluid sequencer is also disposed on one of the semiconductor substrate and the flexible circuit. The semiconductor substrate is attached to a housing. A fluid source is provided for supplying fluid to the semiconductor substrate for ejection by the fluid ejectors. The fluid ejecting device provides low cost construction for application specific miniature fluid jetting devices.Type: ApplicationFiled: October 30, 2002Publication date: May 6, 2004Inventors: Adam Jude Ahne, John Douglas Anderson, Stephen Andrew Budelsky, Mark Joseph Edwards, Randall David Mayo, George Keith Parish, Kristi Maggard Rowe, David Craig Stevenson
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Patent number: 6704996Abstract: The invention provides a method for reducing ink corrosion of exposed metal layers on a chip surface of a semiconductor chip for an ink jet printhead. The method includes depositing a protective layer in a plasma process to the chip surface, the protective layer being deposited adjacent ink ejectors so that the protective layer substantially circumscribes an ink via in the chip. A thick film layer is applied to the protective layer and chip, whereby the protective layer and thick film layer are sufficient to promote increased adhesion between the thick film layer and a nozzle plate attached to the thick film layer thereby substantially reducing a tendency for the nozzle plate and thick film layer to delaminate from one another during printhead manufacture or use and interrupting contact between ink and the exposed metal layers on the chip surface.Type: GrantFiled: February 3, 2003Date of Patent: March 16, 2004Assignee: Lexmark International, Inc.Inventors: Jim Michael Mrvos, George Keith Parish, Kristi Maggard Rowe