Patents by Inventor Stephen John Petherick
Stephen John Petherick 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: 20230184962Abstract: A precise line locator is presented that provides precise line location. The locator includes a housing; a wand attached to the housing, the wand including an array of low frequency antennas arranged along the wand, the array of low frequency antennas defining an electromagnetic locate axis of the line locator system; a real-time kinematic (RTK) Global Navigation Satellite (GNSS) antenna attached to the housing; a user interface positioned in the housing; and a processing circuit coupled to the array of low frequency antennas, the RTK GNSS antenna, and the user interface, wherein the underground line locator determines locate data of the underground line based on signals from the array of low frequency antennas and determines a precise position of the underground line locator from the RTK GNSS antenna.Type: ApplicationFiled: October 18, 2022Publication date: June 15, 2023Inventors: Andrzej Zbigniew Regini, William Moore, Stephen John Petherick
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Patent number: 11474262Abstract: A precise line locator is presented that provides precise line location. The locator includes a housing; a wand attached to the housing, the wand including an array of low frequency antennas arranged along the wand, the array of low frequency antennas defining an electromagnetic locate axis of the line locator system; a real-time kinematic (RTK) Global Navigation Satellite (GNSS) antenna attached to the housing; a user interface positioned in the housing; and a processing circuit coupled to the array of low frequency antennas, the RTK GNSS antenna, and the user interface, wherein the underground line locator determines locate data of the underground line based on signals from the array of low frequency antennas and determines a precise position of the underground line locator from the RTK GNSS antenna.Type: GrantFiled: May 21, 2020Date of Patent: October 18, 2022Assignee: METROTECH CORPORATIONInventors: Andrzej Zbigniew Regini, William Moore, Stephen John Petherick
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Publication number: 20200371253Abstract: A precise line locator is presented that provides precise line location. The locator includes a housing; a wand attached to the housing, the wand including an array of low frequency antennas arranged along the wand, the array of low frequency antennas defining an electromagnetic locate axis of the line locator system; a real-time kinematic (RTK) Global Navigation Satellite (GNSS) antenna attached to the housing; a user interface positioned in the housing; and a processing circuit coupled to the array of low frequency antennas, the RTK GNSS antenna, and the user interface, wherein the underground line locator determines locate data of the underground line based on signals from the array of low frequency antennas and determines a precise position of the underground line locator from the RTK GNSS antenna.Type: ApplicationFiled: May 21, 2020Publication date: November 26, 2020Inventors: Andrzej Zbigniew Regini, William Moore, Stephen John Petherick
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Patent number: 10833901Abstract: A transmitter and receiver for performing a signal select algorithm are provided. A transmitter for providing a signal on a line to be located includes at least one direct digital synthesizer, the direct digital synthesizer producing two component frequencies in response to an input square wave signal; and a feedback loop providing the input square wave.Type: GrantFiled: October 17, 2016Date of Patent: November 10, 2020Assignee: Metrotech CorporationInventors: Stephen John Petherick, George Mainescu, Ion Dracea, Razvan Gabriel Stefanoiu, John Mark Royle
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Patent number: 10768330Abstract: A system and method of for estimating the depth of a marker may include a marker locator. The marker locator may include a first transmitter that generates a first activation signal, second transmitter that generates a second activation signal, a receiver that detects first and second response signals, and a processor that determines a depth of a marker based on the first and second response signals. The first transmitter is located at a first position, and the second transmitter is located at a second position apart from the first position. The first and second response signals respectively correspond to the first and second activation signals. The processor is coupled to the receiver. According to some embodiments, the first and second activation signals and the first and second response signals may be separated by time division multiplexing.Type: GrantFiled: July 21, 2016Date of Patent: September 8, 2020Assignee: Metrotech CorporationInventor: Stephen John Petherick
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Patent number: 10338263Abstract: In accordance with some embodiments, a method and apparatus for providing both a low-pass filter value and a high-pass filter value is presented. The combined filter receives an input value into a half-band finite impulse response (FIR) filter with an odd number of taps labeled 0 through N with corresponding filter coefficients labeled 0 through N where odd numbered filter coefficients are zero, the FIR filter providing a filter value. The median value from the FIR filter is digitally shifted to provide a half median value. The half median value is added to the filter value to provide the low-pass filter value and is subtracted from the filter value to provide the high-pass filter value.Type: GrantFiled: July 6, 2015Date of Patent: July 2, 2019Assignee: Metrotech CorporationInventors: John Mark Royle, Stephen John Petherick
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Publication number: 20170099168Abstract: A transmitter and receiver for performing a signal select algorithm are provided. A transmitter for providing a signal on a line to be located includes at least one direct digital synthesizer, the direct digital synthesizer producing two component frequencies in response to an input square wave signal; and a feedback loop providing the input square wave.Type: ApplicationFiled: October 17, 2016Publication date: April 6, 2017Inventors: STEPHEN JOHN PETHERICK, George MAINESCU, Ion DRACEA, Razvan Gabriel STEFANOIU, John Mark ROYLE
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Publication number: 20170023692Abstract: A system and method of for estimating the depth of a marker may include a marker locator. The marker locator may include a first transmitter that generates a first activation signal, second transmitter that generates a second activation signal, a receiver that detects first and second response signals, and a processor that determines a depth of a marker based on the first and second response signals. The first transmitter is located at a first position, and the second transmitter is located at a second position apart from the first position. The first and second response signals respectively correspond to the first and second activation signals. The processor is coupled to the receiver. According to some embodiments, the first and second activation signals and the first and second response signals may be separated by time division multiplexing.Type: ApplicationFiled: July 21, 2016Publication date: January 26, 2017Applicant: Metrotech CorporationInventor: Stephen John PETHERICK
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Publication number: 20170010381Abstract: In accordance with some embodiments, a method and apparatus for providing both a low-pass filter value and a high-pass filter value is presented. The combined filter receives an input value into a half-band finite impulse response (FIR) filter with an odd number of taps labeled 0 through N with corresponding filter coefficients labeled 0 through N where odd numbered filter coefficients are zero, the FIR filter providing a filter value. The median value from the FIR filter is digitally shifted to provide a half median value. The half median value is added to the filter value to provide the low-pass filter value and is subtracted from the filter value to provide the high-pass filter value.Type: ApplicationFiled: July 6, 2015Publication date: January 12, 2017Inventors: John Mark Royle, Stephen John Petherick
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Patent number: 9473203Abstract: A transmitter and receiver for performing a signal select algorithm are provided. A transmitter for providing a signal on a line to be located includes at least one direct digital synthesizer, the direct digital synthesizer producing two component frequencies in response to an input square wave signal; and a feedback loop providing the input square wave.Type: GrantFiled: April 30, 2013Date of Patent: October 18, 2016Assignee: METROTECH CORPORATIONInventors: Stephen John Petherick, George Mainescu, Ion Dracea, Razvan Gabriel Stefanoiu, John Mark Royle
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Publication number: 20130287125Abstract: A transmitter and receiver for performing a signal select algorithm are provided. A transmitter for providing a signal on a line to be located includes at least one direct digital synthesizer, the direct digital synthesizer producing two component frequencies in response to an input square wave signal; and a feedback loop providing the input square wave.Type: ApplicationFiled: April 30, 2013Publication date: October 31, 2013Applicant: Vivax-MetrotechInventors: Stephen John Petherick, George Mainescu, Ion Dracea, Razvan Gabriel Stefanoiu, John Mark Royle
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Patent number: 6954071Abstract: Cathodic protection voltages are used to resist the damage to pipes or cables from electrolytic effects. However, localized fields can lead to stray currents and may result in corrosion and it is therefore desirable to detect and analyse those stray currents. Frequently there are several pipes in the area of interest and so it is necessary to distinguish between those pipes. Therefore the cathodic voltage on the pipes is modulated, with different pipes having different modulations. This modulation may be applied using an interrupter. Orthogonal modulations with non-unitary aspect ratios improve the discrimination between the pipes while maximizing the energy content of the modulation pattern. The analysis is improved when the interrupters are synchronized with each other and so repeating on the same time-base. This synchronization may be achieved using an external time signal such as GPS. An interrupter which can be used in this regard is also proposed, and may be powered from the cathodic voltage itself.Type: GrantFiled: July 1, 2003Date of Patent: October 11, 2005Assignee: Radiodetection LimitedInventors: David William Flatt, Stephen John Petherick, Robert Ashworth Worsely
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Publication number: 20040004479Abstract: Cathodic protection voltages are used to resist the damage to pipes or cables from electrolytic effects. However, localised fields can lead to stray currents and may result in corrosion and it is therefore desirable to detect and analyse those stray currents. Frequently there are several pipes in the area of interest and so it is necessary to distinguish between those pipes. Therefore the cathodic voltage on the pipes is modulated, with different pipes having different modulations. This modulation may be applied using an interrupter. Orthogonal modulations with non-unitary aspect ratios improve the discrimination between the pipes whilst maximising the energy content of the modulation pattern. The analysis is improved when the interrupters are synchronised with each other and so repeating on the same time-base. This synchronisation may be achieved using an external time signal such as GPS. An interrupter which can be used in this regard is also proposed, and may be powered from the cathodic voltage itself.Type: ApplicationFiled: July 1, 2003Publication date: January 8, 2004Applicant: Radiodetection Limited,Inventors: David William Flatt, Stephen John Petherick, Robert Ashworth Worsley
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Patent number: 6617855Abstract: Cathodic protection voltages are used to resist the damage to pipes or cables from electrolytic effects. However, localised fields can lead to stray currents and may result in corrosion and it is therefore desirable to detect and analyse those stray currents. Frequently there are several pipes in the area of interest and so it is necessary to distinguish between those pipes. Therefore the cathodic voltage on the pipes is modulated, with different pipes having different modulations. This modulation may be applied using an interrupter. Orthogonal modulations with non-unitary aspect ratios improve the discrimination between the pipes whilst maximising the energy content of the modulation pattern. The analysis is improved when the interrupters are synchronised with each other and so repeating on the same time-base. This synchronisation may be achieved using an external time signal such as GPS. An interrupter which can be used in this regard is also proposed, and may be powered from the cathodic voltage itself.Type: GrantFiled: March 23, 2001Date of Patent: September 9, 2003Assignee: Radiodetection LimitedInventors: David William Flatt, Stephen John Petherick, Robert Ashworth Worsely