Patents by Inventor Randolph ELMQUIST

Randolph ELMQUIST 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).

  • Systems, devices, and methods for resistance metrology using graphene with superconducting components
    Patent number: 11867775
    Abstract: A quantum Hall resistance apparatus is to improve resistance standards and includes a substrate, a graphene epitaxially grown on the substrate and having a plurality of first contact patterns at edges of the graphene, a plurality of contacts, each including a second contact pattern and configured to connect to a corresponding first contact pattern, and a protective layer configured to protect the graphene and to increase adherence between the first contact patterns and the second contact patterns. The contacts become a superconductor at a temperature lower than or equal to a predetermined temperature and under up to a predetermined magnetic flux density.
    Type: Grant
    Filed: March 4, 2020
    Date of Patent: January 9, 2024
    Assignees: Government of the United States of America, University of Maryland, College Park
    Inventors: Randolph Elmquist, Albert Rigosi, Mattias Kruskopf
  • SYSTEMS, DEVICES, AND METHODS FOR RESISTANCE METROLOGY USING GRAPHENE WITH SUPERCONDUCTING COMPONENTS
    Publication number: 20220146597
    Abstract: A quantum Hall resistance apparatus is to improve resistance standards and includes a substrate, a graphene epitaxially grown on the substrate and having a plurality of first contact patterns at edges of the graphene, a plurality of contacts, each including a second contact pattern and configured to connect to a corresponding first contact pattern, and a protective layer configured to protect the graphene and to increase adherence between the first contact patterns and the second contact patterns. The contacts become a superconductor at a temperature lower than or equal to a predetermined temperature and under up to a predetermined magnetic flux density.
    Type: Application
    Filed: March 4, 2020
    Publication date: May 12, 2022
    Inventors: Randolph ELMQUIST, Albert RIGOSI, Mattias KRUSKOPF