Patents by Inventor Grigoris Kostakis

Grigoris Kostakis 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).

  • Patent number: 11374396
    Abstract: A circuit protection device is provided. The circuit protection device includes an active energy absorber that is coupled between two power lines in an electrical power distribution system and is configured to selectively conduct fault current responsive to overvoltage conditions. The active energy absorber includes an overvoltage protection module that includes two thyristors that are connected in anti-parallel with one another and a varistor that is connected with the overvoltage protection module as a series circuit. The series circuit including the varistor and the overvoltage protection module is connected between the power lines.
    Type: Grant
    Filed: September 20, 2019
    Date of Patent: June 28, 2022
    Assignee: RIPD RESEARCH AND IP DEVELOPMENT LTD.
    Inventors: Grigoris Kostakis, Zafiris G. Politis, Fotis Xepapas, Alexis Chorozoglou, Christos Prevezianos
  • Patent number: 11114232
    Abstract: An inductor assembly includes a coil including a spirally wound metal foil.
    Type: Grant
    Filed: August 28, 2018
    Date of Patent: September 7, 2021
    Assignee: RAYCAP IP DEVELOPMENT LTD
    Inventors: Grigoris Kostakis, Megaklis Marathias, Fotis Xepapas, Kostas Bakatsias, George Peppas, Zafiris G. Politis
  • Patent number: 10812664
    Abstract: A power transmission system includes a voltage measurement device located on a tower or rooftop for measuring a voltage (VRRH) at a top end of a DC cable connected to a remote radio head (RRH). A voltage control system receives an input voltage (VIN) from a DC power supply and generates an output voltage (VOUT) at a base end of the DC cable. The voltage control system calculates a voltage drop on the DC cable based on the VRRH measurement and then adds different voltage steps to VIN so VOUT compensates for the voltage drop. Calculating the voltage drop allows the PTS to more efficiently supply power to RRHs without having to increase the size of DC power cables.
    Type: Grant
    Filed: January 19, 2018
    Date of Patent: October 20, 2020
    Assignee: RAYCAP S.A.
    Inventors: Grigoris Kostakis, Anestis Kolovos, Nikolaol Tsakiridis, Michael C. Bloxham, Shawn A. Warner, Fotis Xepapas, Zafiris G. Politis
  • Publication number: 20200021098
    Abstract: A crowbar module includes first and second electrical terminals, a module housing, and first and second crowbar units. The first crowbar unit is disposed in the module housing and includes a first thyristor electrically connected between the first and second electrical terminals. The second crowbar unit is disposed in the module housing and includes a second thyristor electrically connected between the first and second electrical terminals in electrical parallel with the first crowbar unit.
    Type: Application
    Filed: September 23, 2019
    Publication date: January 16, 2020
    Inventors: Zafiris G. Politis, Grigoris Kostakis, Thomas Tsovilis, Kostas Bakatsias
  • Publication number: 20200014191
    Abstract: A circuit protection device is provided. The circuit protection device includes an active energy absorber that is coupled between two power lines in an electrical power distribution system and is configured to selectively conduct fault current responsive to overvoltage conditions. The active energy absorber includes an overvoltage protection module that includes two thyristors that are connected in anti-parallel with one another and a varistor that is connected with the overvoltage protection module as a series circuit. The series circuit including the varistor and the overvoltage protection module is connected between the power lines.
    Type: Application
    Filed: September 20, 2019
    Publication date: January 9, 2020
    Inventors: Grigoris Kostakis, Zafiris G. Politis, Fotis Xepapas, Alexis Chorozoglou, Christos Prevezianos
  • Patent number: 10447023
    Abstract: A crowbar module includes first and second electrical terminals, a module housing, and first and second crowbar units. The first crowbar unit is disposed in the module housing and includes a first thyristor electrically connected between the first and second electrical terminals. The second crowbar unit is disposed in the module housing and includes a second thyristor electrically connected between the first and second electrical terminals in electrical parallel with the first crowbar unit.
    Type: Grant
    Filed: March 16, 2016
    Date of Patent: October 15, 2019
    Assignee: RIPD IP Development Ltd
    Inventors: Zafiris G. Politis, Grigoris Kostakis, Thomas Tsovilis, Kostas Bakatsias
  • Patent number: 10447026
    Abstract: A circuit protection device is provided. The circuit protection device includes an active energy absorber that is coupled between two power lines in an electrical power distribution system and is configured to selectively conduct fault current responsive to overvoltage conditions. The active energy absorber includes an overvoltage protection module that includes two thyristors that are connected in anti-parallel with one another and a varistor that is connected with the overvoltage protection module as a series circuit. The series circuit including the varistor and the overvoltage protection module is connected between the power lines.
    Type: Grant
    Filed: December 23, 2016
    Date of Patent: October 15, 2019
    Assignee: RIPD IP DEVELOPMENT LTD
    Inventors: Grigoris Kostakis, Zafiris G. Politis, Fotis Xepapas, Alexis Chorozoglou, Christos Prevezianos
  • Publication number: 20190080837
    Abstract: An inductor assembly includes a coil including a spirally wound metal foil.
    Type: Application
    Filed: August 28, 2018
    Publication date: March 14, 2019
    Inventors: Grigoris Kostakis, Megaklis Marathias, Fotis Xepapas, Kostas Bakatsias, George Peppas, Zafiris G. Politis
  • Publication number: 20180213091
    Abstract: A power transmission system includes a voltage measurement device located on a tower or rooftop for measuring a voltage (VRRH) at a top end of a DC cable connected to a remote radio head (RRH). A voltage control system receives an input voltage (VIN) from a DC power supply and generates an output voltage (VOUT) at a base end of the DC cable. The voltage control system calculates a voltage drop on the DC cable based on the VRRH measurement and then adds different voltage steps to VIN so VOUT compensates for the voltage drop. Calculating the voltage drop allows the PTS to more efficiently supply power to RRHs without having to increase the size of DC power cables.
    Type: Application
    Filed: January 19, 2018
    Publication date: July 26, 2018
    Inventors: Grigoris KOSTAKIS, Anestis KOLOVOS, Nikolaol TSAKIRIDIS, Michael C. BLOXHAM, Shawn A. WARNER, Fotis XEPAPAS, Zafiris G. POLITIS
  • Publication number: 20180183230
    Abstract: A circuit protection device is provided. The circuit protection device includes an active energy absorber that is coupled between two power lines in an electrical power distribution system and is configured to selectively conduct fault current responsive to overvoltage conditions. The active energy absorber includes an overvoltage protection module that includes two thyristors that are connected in anti-parallel with one another and a varistor that is connected with the overvoltage protection module as a series circuit. The series circuit including the varistor and the overvoltage protection module is connected between the power lines.
    Type: Application
    Filed: December 23, 2016
    Publication date: June 28, 2018
    Inventors: Grigoris Kostakis, Zafiris G. Politis, Fotis Xepapas, Alexis Chorozoglou, Christos Prevezianos
  • Publication number: 20160276821
    Abstract: A crowbar module includes first and second electrical terminals, a module housing, and first and second crowbar units. The first crowbar unit is disposed in the module housing and includes a first thyristor electrically connected between the first and second electrical terminals. The second crowbar unit is disposed in the module housing and includes a second thyristor electrically connected between the first and second electrical terminals in electrical parallel with the first crowbar unit.
    Type: Application
    Filed: March 16, 2016
    Publication date: September 22, 2016
    Inventors: Zafiris G. Politis, Grigoris Kostakis, Thomas Tsovilis, Kostas Bakatsias
  • Patent number: 9229048
    Abstract: Devices include an impulse current generator that is configured to provide a direct impulse current (DIC) that includes a specified waveform to a test load during a test duration, a continuous power supply that is configured to provide a continuous power to the test load during the test duration, a trigger circuit that is configured to determine a trigger condition that corresponds to the DIC and to generate a trigger signal responsive to determining the trigger condition, and a current bypass circuit that is configured to receive the trigger signal generated by the trigger circuit and to conduct a majority portion of the DIC being conducted by the load responsive to the trigger signal.
    Type: Grant
    Filed: September 12, 2013
    Date of Patent: January 5, 2016
    Assignee: Raycap Intellectual Property Ltd.
    Inventors: Grigoris Kostakis, Evaggelia Giannelaki, Thomas Tsovilis, Zafiris Politis
  • Patent number: 9231399
    Abstract: A circuit protection device includes an overvoltage monitor circuit that is operable to monitor a power supply circuit to detect an overvoltage condition on the power supply circuit and to change a state of an overvoltage output responsive to the overvoltage condition on the power supply circuit. A bi-directional switch is operable to interrupt or limit current flow though the power supply circuit responsive to the change in the state of the overvoltage output. A bi-directional voltage limiter is connected across output terminals of the circuit protection device and is operable to limit an overvoltage to a predefined voltage limit.
    Type: Grant
    Filed: August 27, 2012
    Date of Patent: January 5, 2016
    Assignee: Raycap Intellectual Property Ltd.
    Inventors: Grigoris Kostakis, Evaggelia Giannelaki, Thomas Tsovilis, Zafiris Politis, Konstantinos Samaras
  • Patent number: 9099860
    Abstract: A suppression system provides more effective protection for communication stations with distributed radio and power systems. The suppression system provides surge protection both locally close to the radio station building where the power plant and telecommunication equipment are located and remotely next to the radios and antennas located outside of the building on the communication tower. Local and remote suppression units may include monitor circuitry that monitor remote and local DC voltage levels and alarm conditions. The alarm conditions may include over-voltage protection failures, intrusions, and/or water infiltration. Displays on both the local and remote suppression units identify the voltage levels and alarm conditions.
    Type: Grant
    Filed: December 9, 2013
    Date of Patent: August 4, 2015
    Assignee: RAYCAP INTELLECTUAL PROPERTY LTD.
    Inventors: Jonathan V. Martinez, Shawn A. Warner, Konstantinos Bakatsias, Grigoris Kostakis, Robert A. Miller
  • Publication number: 20150061692
    Abstract: Devices include an impulse current generator that is configured to provide a direct impulse current (DIC) that includes a specified waveform to a test load during a test duration, a continuous power supply that is configured to provide a continuous power to the test load during the test duration, a trigger circuit that is configured to determine a trigger condition that corresponds to the DIC and to generate a trigger signal responsive to determining the trigger condition, and a current bypass circuit that is configured to receive the trigger signal generated by the trigger circuit and to conduct a majority portion of the DIC being conducted by the load responsive to the trigger signal.
    Type: Application
    Filed: September 12, 2013
    Publication date: March 5, 2015
    Applicant: Raycap Intellectual Property Ltd.
    Inventors: Grigoris Kostakis, Evaggelia Giannelaki, Thomas Tsovilis, Zafiris Politis
  • Publication number: 20140168842
    Abstract: A suppression system provides more effective protection for communication stations with distributed radio and power systems. The suppression system provides surge protection both locally close to the radio station building where the power plant and telecommunication equipment are located and remotely next to the radios and antennas located outside of the building on the communication tower. Local and remote suppression units may include monitor circuitry that monitor remote and local DC voltage levels and alarm conditions. The alarm conditions may include over-voltage protection failures, intrusions, and/or water infiltration. Displays on both the local and remote suppression units identify the voltage levels and alarm conditions.
    Type: Application
    Filed: December 9, 2013
    Publication date: June 19, 2014
    Applicant: Raycap Intellectual Property Ltd.
    Inventors: Jonathan V. Martinez, Shawn A. Warner, Konstantinos Bakatsias, Grigoris Kostakis, Robert A. Miller
  • Patent number: 8743525
    Abstract: An overvoltage protection device includes first and second electrically conductive electrode members and a varistor member formed of a varistor material and electrically connected with each of the first and second electrode members. The overvoltage protection device has an integral fail-safe mechanism operative to electrically short circuit the first and second electrode members about the varistor member by fusing first and second metal surfaces in the overvoltage protection device to one another using an electric arc.
    Type: Grant
    Filed: July 18, 2012
    Date of Patent: June 3, 2014
    Assignee: Raycap Intellectual Property, Ltd
    Inventors: Fotis Xepapas, Evaggelia Giannelaki, Grigoris Kostakis, Zafiris Politis, Kostas Samaras
  • Publication number: 20140055898
    Abstract: A circuit protection device includes an overvoltage monitor circuit that is operable to monitor a power supply circuit to detect an overvoltage condition on the power supply circuit and to change a state of an overvoltage output responsive to the overvoltage condition on the power supply circuit. A bi-directional switch is operable to interrupt or limit current flow though the power supply circuit responsive to the change in the state of the overvoltage output. A bi-directional voltage limiter is connected across output terminals of the circuit protection device and is operable to limit an overvoltage to a predefined voltage limit.
    Type: Application
    Filed: August 27, 2012
    Publication date: February 27, 2014
    Applicant: Raycap Corporation
    Inventors: Grigoris Kostakis, Evaggelia Giannelaki, Thomas Tsovilis, Zafiris Politis, Konstantinos Samaras
  • Publication number: 20130335869
    Abstract: An overvoltage protection device includes first and second electrically conductive electrode members and a varistor member formed of a varistor material and electrically connected with each of the first and second electrode members. The overvoltage protection device has an integral fail-safe mechanism operative to electrically short circuit the first and second electrode members about the varistor member by fusing first and second metal surfaces in the overvoltage protection device to one another using an electric arc.
    Type: Application
    Filed: July 18, 2012
    Publication date: December 19, 2013
    Inventors: Fotis Xepapas, Evaggelia Giannelaki, Grigoris Kostakis, Zafiris Politis, Kostas Samaras