Patents by Inventor Staffan Ralberg

Staffan Ralberg 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 a method for non-contacting sensing of the rotational state of a rotor
    Patent number: 6850054
    Abstract: A device and a method for non-contacting sensing of the rotational state of a rotor (10). The rotor has a surface divided into an electrically conductive part (1e) and a nonconductive part (1f). Three electric coils (2a, 2b, 2c) are each included in a respective parallel resonant circuit and are applied close to and with their longitudinal axes oriented towards the rotational path of the electrically conductive part of the rotor. The resonant oscillations are damped depending on the rotational position of the rotor. The rotational state is evaluated with an electronic circuit. In a liquid-flow meter, the coils may be applied in the dry part of the meter.
    Type: Grant
    Filed: July 2, 2001
    Date of Patent: February 1, 2005
    Assignee: Elster Messtechnik GmbH
    Inventors: Tord Kjellin, Staffan Ralberg
  • Device and a method for non-contacting sensing of the rotational state of a rotor
    Publication number: 20040012384
    Abstract: A device and a method for non-contacting sensing of the rotational state of a rotor (10). The rotor has a surface divided into an electrically conductive part (1e) and a nonconductive part (1f). Three electric coils (2a, 2b, 2c) are each included in a respective parallel resonant circuit and are applied close to and with their longitudinal axes oriented towards the rotational path of the electrically conductive part of the rotor. The resonant oscillations are damped depending on the rotational position of the rotor. The rotational state is evaluated with an electronic circuit In a liquid-flow meter, the coils may be applied in the dry part of the meter.
    Type: Application
    Filed: July 25, 2003
    Publication date: January 22, 2004
    Inventors: Tord Kjellin, Staffan Ralberg