Patents by Inventor Helmut Sandau

Helmut Sandau 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).

  • Keyless system for actuating a motor-vehicle door latch
    Patent number: 7126453
    Abstract: A keyless actuating system has a switchable electrical device, a coded transponder adapted to be carried by a user, and a vehicle-mounted interrogating unit adapted when enabled to remotely coact with the transponder for switching the device when the transponder holds a predetermined code. A first capacitor element is carried on the vehicle, and a second capacitor element is carried on the user. A control circuit determines the capacitance between the first and second elements when the user is near the vehicle for enabling the interrogating unit only when the capacitance between the first and second elements passes a predetermined threshold. Normally the second capacitor element is actually the user.
    Type: Grant
    Filed: February 19, 2002
    Date of Patent: October 24, 2006
    Assignee: Kiekert AG
    Inventors: Helmut Sandau, Bernd Gerdes
  • Keyless system for actuating a motor-vehicle door latch
    Publication number: 20020125994
    Abstract: A keyless actuating system has a switchable electrical device, a coded transponder adapted to be carried by a user, and a vehicle-mounted interrogating unit adapted when enabled to remotely coact with the transponder for switching the device when the transponder holds a predetermined code. A first capacitor element is carried on the vehicle, and a second capacitor element is carried on the user. A control circuit determines the capacitance between the first and second elements when the user is near the vehicle for enabling the interrogating unit only when the capacitance between the first and second elements passes a predetermined threshold. Normally the second capacitor element is actually the user.
    Type: Application
    Filed: February 19, 2002
    Publication date: September 12, 2002
    Applicant: Kiekert AG
    Inventors: Helmut Sandau, Bernd Gerdes