Patents by Inventor Hans-Joachim Popp

Hans-Joachim Popp 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).

  • Device and process for detecting and identifying wearable user identification units
    Patent number: 5984175
    Abstract: A device for detecting and identifying wearable identification units (20) for users at a predetermined distance around a central station (2). The central station (2) has a transmitter (4) and a receiver (6) for electromagnetic signals and a control unit (8), which initiates the sending of a polling signal at predetermined time. The time may be based on multiples of intervals.
    Type: Grant
    Filed: August 28, 1997
    Date of Patent: November 16, 1999
    Assignee: Dragerwerk AG
    Inventor: Hans-Joachim Popp