Patents by Inventor David Goad
David Goad 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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Publication number: 20240139724Abstract: Highly efficient and rapid filtration-based concentration devices, systems and methods are disclosed with a rotary distribution valve connected to a syringe pump which maintains control and flow of various fluids to a sample through a retentate port.Type: ApplicationFiled: October 26, 2023Publication date: May 2, 2024Inventors: Andrew E. Page, David Goad, Steven D. Graham
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Publication number: 20220341826Abstract: Devices, systems and methods are disclosed which relate to a prefiltration device that can be used with the concentrating pipette instruments and other devices which draw a sample in through one opening and dispense a concentrated or eluted sample out through the same opening. The device allows the sample to be passed through a prefilter when entering the opening and then bypassed the prefilter when being dispensed through the same opening.Type: ApplicationFiled: April 22, 2022Publication date: October 27, 2022Inventors: Alec D. Adolphson, Andrew E. Page, John D. Birkenholz, David Goad
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Patent number: 8313621Abstract: A method and apparatus for anodizing a porous valve metal pellet in a flowing liquid electrolyte is described. The apparatus comprises an insulative container comprised of a lower region, a central region including a cavity for holding the pellet, an upper region, and a continuous passageway extending through the lower, central, and upper regions. Lower and upper screens serving as lower and upper electrodes are disposed in the passageway in the lower and upper container regions, respectively. During anodizing, the electrolyte flows through the lower container region including the lower screen, the porous pellet and then the upper container region including the upper screen. The lower and upper screens are at an opposite electrical polarity as the pellet so that a dielectric oxide is formed on the exposed valve metal including interior portions of the pellet that are exposed to the flowing electrolyte.Type: GrantFiled: January 28, 2011Date of Patent: November 20, 2012Assignee: Greatbatch Ltd.Inventors: David Goad, Neal Nesselbeck, Jason Hahl
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Publication number: 20110122543Abstract: A method and apparatus for anodizing a porous valve metal pellet in a flowing liquid electrolyte is described. The apparatus comprises an insulative container comprised of a lower region, a central region including a cavity for holding the pellet, an upper region, and a continuous passageway extending through the lower, central, and upper regions. Lower and upper screens serving as lower and upper electrodes are disposed in the passageway in the lower and upper container regions, respectively. During anodizing, the electrolyte flows through the lower container region including the lower screen, the porous pellet and then the upper container region including the upper screen. The lower and upper screens are at an opposite electrical polarity as the pellet so that a dielectric oxide is formed on the exposed valve metal including interior portions of the pellet that are exposed to the flowing electrolyte.Type: ApplicationFiled: January 28, 2011Publication date: May 26, 2011Applicant: Greatbatch Ltd.Inventors: David Goad, Neal Nesselbeck, Jason Hahl
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Patent number: 7879217Abstract: A method and apparatus for anodizing a porous valve metal pellet in a flowing liquid electrolyte is described. The apparatus comprises an insulative container comprised of a lower region, a central region including a cavity for holding the pellet, an upper region, and a continuous passageway extending through the lower, central, and upper regions. Lower and upper screens serving as lower and upper electrodes are disposed in the passageway in the lower and upper container regions, respectively. During anodizing, the electrolyte flows through the lower container region including the lower screen, the porous pellet and then the upper container region including the upper screen. The lower and upper screens are at an opposite electrical polarity as the pellet so that a dielectric oxide is formed on the exposed valve metal including interior portions of the pellet that are exposed to the flowing electrolyte.Type: GrantFiled: December 1, 2006Date of Patent: February 1, 2011Assignee: Greatbatch Ltd.Inventors: David Goad, Neal Nesselbeck, Jason Hahl
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Patent number: 7727372Abstract: A method for anodizing valve metal structures to a target formation voltage is described. The valve metal structures are placed in an anodizing electrolyte and connected to a power supply that generates a source voltage to at least one current limiting device. If at least two current limiting devices are used, they are in series with the valve metal structures with the one current limiting device connected to at least one structure. The valve metal structures are then subjected to a current that decreases over time, a formation voltage that increases over time to a level below the voltage from the power supply and a power level that is self-adjusted to a level that decreases excessive heating in the structure. The invention also includes the components for the method.Type: GrantFiled: December 5, 2005Date of Patent: June 1, 2010Assignee: Greatbatch Ltd.Inventors: Yanming Liu, Neal Nesselbeck, David Goad, Barry Muffoletto
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Patent number: 7286336Abstract: An oxygen plasma process for treating a dielectric oxide layer, particularly an anodic oxide, subsequent to its incorporation into an electrolytic capacitor is described. The present treatment reduces DC leakage and improves shelf life stability of the resulting capacitor in comparison to anodic oxides treated in a conventional manner. This is important for critical applications such as implantable cardioverter defibrillators where capacitor charging time and charge/discharge energy efficiency are critical.Type: GrantFiled: May 13, 2005Date of Patent: October 23, 2007Assignee: Greatbatch Ltd.Inventors: Yanming Liu, Barry Muffoletto, David Goad
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Publication number: 20070221507Abstract: An improved formation electrolyte and method for anodizing valve metal anodes used in electrolytic capacitors, particularly for high voltage sintered tantalum powder anode, is described. The anodizing electrolyte composition is comprised of 1) a phosphorus oxyacid and/or its salt, such as phosphoric acid and ammonium phosphate; 2) a weak inorganic acid/salt (such as boric acid, ammonium borate) or a weak carboxylic acid/salt; 3) water; and 4) a protic solvent or a mixture of two or more protic solvents. The weak mono-carboxylic acid/salt has 2 to 7 carbon atoms and the weak di- or poly-carboxylic acid/salt has 3 to 13 carbon atoms. The present electrolytes have high anodizing breakdown voltage capability and the formed dielectric oxides have improved oxide quality including good oxide hydration resistant ability, and result in more stable capacitor performance. These properties are particularly important for critical applications such as implantable cardioverter defibrillators (ICDs).Type: ApplicationFiled: February 21, 2007Publication date: September 27, 2007Applicant: GREATBATCH LTD.Inventors: Yanming Liu, David Goad, David Budek, Christina Scheuer
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Publication number: 20070125658Abstract: A method and apparatus for anodizing a porous valve metal pellet in a flowing liquid electrolyte is described. The apparatus comprises an insulative container comprised of a lower region, a central region including a cavity for holding the pellet, an upper region, and a continuous passageway extending through the lower, central, and upper regions. Lower and upper screens serving as lower and upper electrodes are disposed in the passageway in the lower and upper container regions, respectively. During anodizing, the electrolyte flows through the lower container region including the lower screen, the porous pellet and then the upper container region including the upper screen. The lower and upper screens are at an opposite electrical polarity as the pellet so that a dielectric oxide is formed on the exposed valve metal including interior portions of the pellet that are exposed to the flowing electrolyte.Type: ApplicationFiled: December 1, 2006Publication date: June 7, 2007Inventors: David Goad, Neal Nesselbeck, Jason Hahl
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Publication number: 20060196774Abstract: A method for anodizing valve metal structures to a target formation voltage is described. The valve metal structures are placed in an anodizing electrolyte and connected to a power supply that generates a source voltage to at least one current limiting device. If at least two current limiting devices are used, they are in series with the valve metal structures with the one current limiting device connected to at least one structure. The valve metal structures are then subjected to a current that decreases over time, a formation voltage that increases over time to a level below the voltage from the power supply and a power level that is self-adjusted to a level that decreases excessive heating in the structure. The invention also includes the components for the method.Type: ApplicationFiled: December 5, 2005Publication date: September 7, 2006Applicant: GREATBATCH, INC.Inventors: Yanming Liu, Neal Nesselbeck, David Goad, Barry Muffoletto
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Publication number: 20060191796Abstract: The present invention is directed to a method for anodizing valve metal structures to a target formation voltage with a controlled power source.Type: ApplicationFiled: December 1, 2005Publication date: August 31, 2006Applicant: Greatbatch, Inc.Inventors: Barry Muffoletto, David Goad, Neal Nesselbeck, Ashish Shah, Joseph Spaulding, Monica Kaforey, Christina Scheuer, Yanming Liu
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Publication number: 20050254199Abstract: An oxygen plasma process for treating a dielectric oxide layer, particularly an anodic oxide, subsequent to its incorporation into an electrolytic capacitor is described. The present treatment reduces DC leakage and improves shelf life stability of the resulting capacitor in comparison to anodic oxides treated in a conventional manner. This is important for critical applications such as implantable cardioverter defibrillators where capacitor charging time and charge/discharge energy efficiency are critical.Type: ApplicationFiled: May 13, 2005Publication date: November 17, 2005Inventors: Yanming Liu, Barry Muffoletto, David Goad
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Patent number: 6965510Abstract: A sintering method for valve metal powders, such as tantalum, niobium, aluminum, titanium, and their alloys, is described. The valve metal powders are pressed into a pellet and sintered at a relatively high temperature, but for a relatively short time. The anodized valve metal structure is then useful as an anode in an electrolytic capacitor.Type: GrantFiled: December 13, 2004Date of Patent: November 15, 2005Assignee: Wilson Greatbatch Technologies, Inc.Inventors: Yanming Liu, David Goad, Barry Muffoletto
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Patent number: 5405493Abstract: A method of etching increases the surface area of a metal foil by creating uniformly distributed etch tunnels. The foil is pretreated by depositing a discontinuous surface layer of metal that is cathodic to the foil, followed by chemically etching the foil to remove a portion of the deposited metal. Finally, the foil is electrochemically etched to create the etch tunnels.Type: GrantFiled: January 26, 1994Date of Patent: April 11, 1995Assignee: KDK CorporationInventor: David Goad