Patents by Inventor Nathan A. Johanningsmeier

Nathan A. Johanningsmeier 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).

  • GROUNDING CIRCUIT FOR ALTERNATE AUDIO PLUG DESIGNS
    Publication number: 20130329916
    Abstract: Circuits, methods, and apparatus for grounding contacts in an audio jack. One example may provide a driver, such as a charge pump, driving a first depletion mode transistor coupled between a first contact in an audio jack and ground, and a second depletion mode transistor coupled between a second contact in the audio jack and ground. The first depletion mode transistor and second depletion mode transistor may be p-channel transistors or n-channel transistors.
    Type: Application
    Filed: June 10, 2012
    Publication date: December 12, 2013
    Applicant: Apple Inc.
    Inventors: David C. Breece, III, Cara S. Yang, Nathan Johanningsmeier, Kavitha Srinivasan