Patents by Inventor Matthew Purcell
Matthew Purcell 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: 20220274006Abstract: The present application relates to athletic field covers with wind-refracting layer.Type: ApplicationFiled: February 26, 2021Publication date: September 1, 2022Inventor: Matthew Purcell
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Patent number: 10065910Abstract: The present disclosure relates generally to ceramic materials suitable for use as catalyst support materials, catalysts using such materials and methods for using them, such as methods for converting sugars, sugar alcohols, glycerol, and bio-renewable organic acids to commercially-valuable chemicals and intermediates. One aspect of the invention is a ceramic material including zirconium oxide and one or more metal oxides selected from nickel oxide, copper oxide, cobalt oxide, iron oxide and zinc oxide, the ceramic material being at least about 50 wt. % zirconium oxide. In certain embodiments, the ceramic material is substantially free of any binder, extrusion aid or additional stabilizing agent.Type: GrantFiled: March 20, 2017Date of Patent: September 4, 2018Assignee: Clariant CorporationInventors: Wenqin Shen, Franz Petzold, Karen Libby, Wayne Turbeville, Matthew Purcell, Marc K. Born
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Publication number: 20170190643Abstract: The present disclosure relates generally to ceramic materials suitable for use as catalyst support materials, catalysts using such materials and methods for using them, such as methods for converting sugars, sugar alcohols, glycerol, and bio-renewable organic acids to commercially-valuable chemicals and intermediates. One aspect of the invention is a ceramic material including zirconium oxide and one or more metal oxides selected from nickel oxide, copper oxide, cobalt oxide, iron oxide and zinc oxide, the ceramic material being at least about 50 wt. % zirconium oxide. In certain embodiments, the ceramic material is substantially free of any binder, extrusion aid or additional stabilizing agent.Type: ApplicationFiled: March 20, 2017Publication date: July 6, 2017Inventors: Wenqin Shen, Franz Petzold, Karen Libby, Wayne Turbeville, Matthew Purcell, Marc K. Born
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Patent number: 9313427Abstract: An image sensor having improved dynamic range includes a signal that is read out for a selection of pixels which act as a calibration to govern the choice of exposure levels to be applied to the rest of the array. In this way, the sensor is operable to adapt to variations in scene intensity. The pixels in the array are vertically and horizontally addressed so as to enable accounted for small areas of intensity variation across an imaged scene.Type: GrantFiled: December 11, 2012Date of Patent: April 12, 2016Assignees: STMicroelectronics (Grenoble 2) SAS, STMicroelectronics (Research & Development) LimitedInventors: John Kevin Moore, Matthew Purcell, Graeme Storm, Tarek Lule
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Publication number: 20150314274Abstract: The present disclosure relates generally to ceramic materials suitable for use as catalyst support materials, catalysts using such materials and methods for using them, such as methods for converting sugars, sugar alcohols, glycerol, and bio-renewable organic acids to commercially-valuable chemicals and intermediates. One aspect of the invention is a ceramic material including zirconium oxide and one or more metal oxides selected from nickel oxide, copper oxide, cobalt oxide, iron oxide and zinc oxide, the ceramic material being at least about 50 wt. % zirconium oxide. In certain embodiments, the ceramic material is substantially free of any binder or additional stabilizing agent.Type: ApplicationFiled: May 2, 2014Publication date: November 5, 2015Applicant: CLARIANT CORPORATIONInventors: Wenqin SHEN, Franz PETZOLD, Karen LIBBY, Wayne TURBEVILLE, Matthew PURCELL, Marc K. BORN
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Patent number: 8841595Abstract: An image sensor includes an array of pixels. Each pixel has at least one photo-sensitive element. Readout circuitry receives an analog signal from each pixel at a first time and at a second time, between which the analog signal changes. The image sensor further includes associated support circuitry which is a source of time variant noise. The signal level at both first and second times includes pixel noise. Sample and hold circuitry is provided to maintain substantially level at least a proportion of this support circuitry noise time invariant at the sensor output between the first time and the second time.Type: GrantFiled: June 30, 2011Date of Patent: September 23, 2014Assignee: STMicroelectronics (Research & Development) LimitedInventors: Graeme Storm, Matthew Purcell
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Patent number: 8772695Abstract: Each column of pixels in an image sensor array has at least two column bitlines connected to an output of each pixel. A readout input circuit includes first inputs and a second input. Each first input is connected, via a capacitance, to a comparator input node. The second input is connected via a capacitance to the same comparator input node. The first inputs receive, in parallel, an analog signal acquired from the pixels via the column bitlines. The analog signals vary during a pixel readout period and have a first level during a first calibration period and a second level during a second read period with the analog signals being constantly read onto the capacitances during both the first calibration period and the second read period. The comparator compares an average of the signals on the plurality of first inputs to the reference signal.Type: GrantFiled: December 13, 2011Date of Patent: July 8, 2014Assignee: STMicroelectronics (Research & Development) LimitedInventors: Graeme Storm, Matthew Purcell, Derek Tolmie, John Kevin Moore, Michael Wigley
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Publication number: 20120312963Abstract: Each column of pixels in an image sensor array has at least two column bitlines connected to an output of each pixel. A readout input circuit includes first inputs and a second input. Each first input is connected, via a capacitance, to a comparator input node. The second input is connected via a capacitance to the same comparator input node. The first inputs receive, in parallel, an analog signal acquired from the pixels via the column bitlines. The analog signals vary during a pixel readout period and have a first level during a first calibration period and a second level during a second read period with the analog signals being constantly read onto the capacitances during both the first calibration period and the second read period. The comparator compares an average of the signals on the plurality of first inputs to the reference signal.Type: ApplicationFiled: December 13, 2011Publication date: December 13, 2012Applicant: STMMicroelectronics (Research & Development) LimtedInventors: Graeme STORM, Matthew PURCELL, Derek TOLMIE, John Kevin MOORE, Michael WIGLEY
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Patent number: 8305474Abstract: An image sensor has a per-column ADC arrangement including first and second capacitors allowing a comparator circuit to perform correlated double sampling. The capacitors are continuously connected to, respectively, the analog pixel signal and a ramp signal without use of a hold operation. The comparator circuit comprises a differential input being connected to the junction of the two capacitors and being biased by a reference signal. The reference signal is preferably sampled and held from a reference voltage. The use of a differential input as first stage of the comparator addresses problems arising from ground voltage bounce when a large pixel array images a scene with low contrast. Connectivity of the differential input stage allows the ramp signal to see a constant capacitive load thus reduce image artifacts referred to as smear.Type: GrantFiled: November 19, 2009Date of Patent: November 6, 2012Assignees: STMicroelectronics (R&D) Ltd., STMicroelectronics SA (Morocco), STMicroelectronics (Grenoble 2) SASInventors: Matthew Purcell, Graeme Storm, Derek Tolmie, Mhamed El Hachimi, Laurent Simony, Min Qu
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Patent number: 8134623Abstract: An image sensor has a per-column ADC arrangement including first and second capacitors for correlated double sampling, and a comparator circuit. The capacitors are continuously connected to, respectively, the analog pixel signal and a ramp signal without use of a hold operation. The comparator circuit comprises a differential amplifier having one input connected to the junction of the two capacitors and another input connected to a reference signal. The reference signal is preferably sampled and held from a reference voltage. The use of a differential amplifier as first stage of the comparator addresses problems arising from ground voltage bounce when a large pixel array images a scene with low contrast.Type: GrantFiled: March 11, 2009Date of Patent: March 13, 2012Assignee: STMicroelectronics (Research & Development) Ltd.Inventors: Matthew Purcell, Graeme Storm, Min Qu
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Publication number: 20120006973Abstract: An image sensor includes an array of pixels. Each pixel has at least one photo-sensitive element. Readout circuitry receives an analog signal from each pixel at a first time and at a second time, between which the analog signal changes. The image sensor further includes associated support circuitry which is a source of time variant noise. The signal level at both first and second times includes pixel noise. Sample and hold circuitry is provided to maintain substantially level at least a proportion of this support circuitry noise time invariant at the sensor output between the first time and the second time.Type: ApplicationFiled: June 30, 2011Publication date: January 12, 2012Applicant: STMicroelectronics (Research & Development) LimitedInventors: Graeme Storm, Matthew Purcell
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Patent number: 8054210Abstract: An image sensor includes a pixel array, and a correlated double sample circuit coupled to one of the pixels in the pixel array. The correlated double sample circuit includes first and second inputs, and first and second sample capacitors respectively coupled to the first and second inputs. The first input is for receiving an analog signal from a pixel, and the second input is for receiving a time varying reference signal. The analog signal varies during a pixel readout period, and has a first level during a first reset period and a second-level during a second read period. A comparator circuit compares the time varying reference signal and the analog signal. The analog signal and the time varying reference signal are constantly read onto one of the first and second sample capacitors during both the first reset period and the second read period.Type: GrantFiled: January 17, 2008Date of Patent: November 8, 2011Assignee: STMicroelectronics (Research & Development) LimitedInventors: Matthew Purcell, Rachel Elliott, Graeme Storm
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Publication number: 20100157035Abstract: An image sensor has a per-column ADC arrangement including first and second capacitors allowing a comparator circuit to perform correlated double sampling. The capacitors are continuously connected to, respectively, the analog pixel signal and a ramp signal without use of a hold operation. The comparator circuit comprises a differential input being connected to the junction of the two capacitors and being biased by a reference signal. The reference signal is preferably sampled and held from a reference voltage. The use of a differential input as first stage of the comparator addresses problems arising from ground voltage bounce when a large pixel array images a scene with low contrast. Connectivity of the differential input stage allows the ramp signal to see a constant capacitive load thus reduce image artifacts referred to as smear.Type: ApplicationFiled: November 19, 2009Publication date: June 24, 2010Applicants: STMicroelectronics (Research & Development) Limited, STMicroelectronics SA (Morocco), STMicroelectronics (Grenoble 2) SASInventors: Matthew Purcell, Graeme Storm, Derek Tolmie, Mhamed El Hachim, Laurent Simony, Min Qu
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Patent number: 7659500Abstract: A column current source for an image sensor includes an array of pixels arranged in rows and columns, a reference current source, a transistor connected as a source follower to the reference current source and forming one half of a current mirror, and a plurality of current sources each connected to a column of pixels and with each current source forming the other half of the current mirror, thereby mirroring the reference current source. The current sources are connected to a first common node. A resistor is connected between the first common node and a second common node. One or more resistors are connected in series between the second common node and the transistor drain, and two or more switches are selectively operable to short circuit the resistors allowing the current sources to provide more than two current levels, thereby optimizing the image sensor current consumption for mobile devices.Type: GrantFiled: December 28, 2007Date of Patent: February 9, 2010Assignee: STMicroelectronics (Research & Development ) LimitedInventor: Matthew Purcell
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Patent number: 7659498Abstract: An image sensor includes a power supply ripple rejection circuit having an input connected to a supply voltage reference, and an output connected to an output voltage reference. The power supply ripple rejection circuit reduces the affect of variance in the supply voltage reference on the output voltage reference.Type: GrantFiled: January 21, 2005Date of Patent: February 9, 2010Assignee: STMicroelectronics Ltd.Inventors: Matthew Purcell, Arnauld Laflaquiere
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Publication number: 20090237536Abstract: An image sensor has a per-column ADC arrangement including first and second capacitors for correlated double sampling, and a comparator circuit. The capacitors are continuously connected to, respectively, the analog pixel signal and a ramp signal without use of a hold operation. The comparator circuit comprises a differential amplifier having one input connected to the junction of the two capacitors and another input connected to a reference signal. The reference signal is preferably sampled and held from a reference voltage. The use of a differential amplifier as first stage of the comparator addresses problems arising from ground voltage bounce when a large pixel array images a scene with low contrast.Type: ApplicationFiled: March 11, 2009Publication date: September 24, 2009Applicant: STMicroelectronics (Research & Development) LimitedInventors: Matthew Purcell, Graeme Storm, Min Qu
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Publication number: 20080210848Abstract: A column current source for an image sensor includes an array of pixels arranged in rows and columns, a reference current source, a transistor connected as a source follower to the reference current source and forming one half of a current mirror, and a plurality of current sources each connected to a column of pixels and with each current source forming the other half of the current mirror, thereby mirroring the reference current source. The current sources are connected to a first common node. A resistor is connected between the first common node and a second common node. One or more resistors are connected in series between the second common node and the transistor drain, and two or more switches are selectively operable to short circuit the resistors allowing the current sources to provide more than two current levels, thereby optimizing the image sensor current consumption for mobile devices.Type: ApplicationFiled: December 28, 2007Publication date: September 4, 2008Applicant: STMicroelectronics (Research & Development) LimitedInventor: Matthew PURCELL
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Publication number: 20080192126Abstract: An image sensor includes a pixel array, and a correlated double sample circuit coupled to one of the pixels in the pixel array. The correlated double sample circuit includes first and second inputs, and first and second sample capacitors respectively coupled to the first and second inputs. The first input is for receiving an analog signal from a pixel, and the second input is for receiving a time varying reference signal. The analog signal varies during a pixel readout period, and has a first level during a first reset period and a second-level during a second read period. A comparator circuit compares the time varying reference signal and the analog signal. The analog signal and the time varying reference signal are constantly read onto one of the first and second sample capacitors during both the first reset period and the second read period.Type: ApplicationFiled: January 17, 2008Publication date: August 14, 2008Applicant: STMicroelectronics (Research & Development) Limited, Country of Incorporation: United KingdomInventors: Matthew Purcell, Rachel Elliott, Graeme Storm
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Patent number: 7265329Abstract: The image sensor makes use of a distributed amplifier having its non-inverting input provided by a pixel amplifier transistor, and its inverting input and output provided in the pixel's column circuitry. The distributed amplifier is directly integrated with the image sensor's ADC circuit, and sampling and autozero are performed in a single step, thus reducing the number of noise contributions made by the components of the image sensor's readout chain.Type: GrantFiled: September 9, 2005Date of Patent: September 4, 2007Assignee: STMicroelectronics Ltd.Inventors: Robert Henderson, Matthew Purcell
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Patent number: 7238925Abstract: An image sensor includes an array of pixels arranged in rows and columns. A reference current source provides the reference current to a transistor forming one half of a current mirror. Each column has a current source, which forms the other half of a current mirror. A switch is provided to selectively connect a resistance between ground and the transistor. When the resistance is connected, the transistor is starved of gate-source voltage, which reduces the current supplied by each current source.Type: GrantFiled: April 13, 2005Date of Patent: July 3, 2007Assignee: STMicroelectronics Ltd.Inventors: Matthew Purcell, Robert Henderson