Patents by Inventor Rafmag CABRERA-PIZARRO

Rafmag CABRERA-PIZARRO 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).

  • Voltage-controlled resistor based on phase transition materials
    Patent number: 10217549
    Abstract: A voltage-controlled resistor is provided. The resistor structure includes first and second resistive elements each including a phase change material that changes resistance in response to a change in temperature of the phase change material. A heating element is arranged in thermal contact with the first and second resistive elements. A control circuit receives a selected input voltage and supplies power based on the selected input voltage to the heating element to heat the first and second resistive elements to a selected temperature. The first and second resistive elements, which are proximate to and electrically isolated from each other, have a selected resistance at the selected temperature. A feedback circuit senses a change in temperature of the first resistive element and adjusts power supplied to the heating element based on the change in temperature of the first resistive element to maintain a resistance of the second resistive element at the selected resistance.
    Type: Grant
    Filed: March 7, 2014
    Date of Patent: February 26, 2019
    Assignee: Board of Trustees of Michigan State University
    Inventors: Rafmag Cabrera-Pizarro, Nelson Sepulveda-Alancastro
  • VOLTAGE-CONTROLLED RESISTOR BASED ON PHASE TRANSITION MATERIALS
    Publication number: 20160020005
    Abstract: A voltage-controlled resistor is provided. The resistor structure includes first and second resistive elements each including a phase change material that changes resistance in response to a change in temperature of the phase change material. A heating element is arranged in thermal contact with the first and second resistive elements. A control circuit receives a selected input voltage and supplies power based on the selected input voltage to the heating element to heat the first and second resistive elements to a selected temperature. The first and second resistive elements, which are proximate to and electrically isolated from each other, have a selected resistance at the selected temperature. A feedback circuit senses a change in temperature of the first resistive element and adjusts power supplied to the heating element based on the change in temperature of the first resistive element to maintain a resistance of the second resistive element at the selected resistance.
    Type: Application
    Filed: March 7, 2014
    Publication date: January 21, 2016
    Applicant: BOARD OF TRUSTEES OF MICHIGAN STATE UNIVERSTIY
    Inventors: Rafmag CABRERA-PIZARRO, Nelson SEPULVEDA-ALANCASTRO