Patents by Inventor Josef Preishuberpflugl

Josef Preishuberpflugl 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).

  • Contactless data transmission and receiving device with a synchronous demodulator
    Patent number: 6028503
    Abstract: A transmission and receiving device for contact data transmission between the device and a transponder. The transmission and receiving device has an antenna resonant circuit, a synchronous demodulator, a measuring unit, a control unit, and a reference signal generator. In operation, the device and the transponder are inductively coupled to each other through the antenna resonance circuit of the device and an antenna resonance circuit in the transponder. In response to an interrogation by the device, the transponder sends a load modulated digital signal to the device. The synchronous demodulator detects digital response data contained in the load modulated digital signal. The measuring unit measures a phase shift between a reference signal generated by the reference signal generator and a resonance signal generated in the antenna resonance circuit in the device by the sent load modulated digital signal.
    Type: Grant
    Filed: November 4, 1997
    Date of Patent: February 22, 2000
    Assignee: U.S. Philips Corporation
    Inventors: Josef Preishuberpflugl, Siegfried Arnold, Bernhard Spiess, Hubert Watzinger