Patents by Inventor Rune Rosander

Rune Rosander 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).

  • Patent number: 4757545
    Abstract: A microphone comprising a double membrane condenser unit and an amplifier circuit is connected to a power supply. Signals from the two membranes of the unit are fed to each one amplifier and to each one impedance transformer and are delivered through a signal wire to a power supply unit having phantom power supply. In the power supply unit, the signals are added or subtracted in order to give a continuously variable directional characteristic of a round or eight characteristic and are added or subtracted in different proportions by means of a potentiometer in order to give different degrees of a cardioid characteristic. The microphone can also be used as a stereo microphone by assigning the two signals to the right and the left channel, respectively. For balanced signals an inverting buffer is used and a second impedance transformer.
    Type: Grant
    Filed: February 24, 1984
    Date of Patent: July 12, 1988
    Inventor: Rune Rosander