Patents by Inventor Helge Wahlgreen

Helge Wahlgreen 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).

  • Pick-up system for bridge of stringed musical instrument and musical instrument employing same
    Patent number: 5223660
    Abstract: A pick-up system for placing in connection with the bridge of a stringed instrument consisting of individual, cylindrically designed microphone units, that are inserted in bored tight-fitting holes in the bridge close to the individual strings, such that the microphones are rotatably frictionally fixed therein. The acoustic axes of the microphones are transversely oriented, whereby for individual adjustment it is possible by turning the microphones in the tight-fitting holes to adjust the angle between the individual axes and the respective directions to the strings.
    Type: Grant
    Filed: April 26, 1990
    Date of Patent: June 29, 1993
    Assignee: Jorgen Wilson
    Inventor: Helge Wahlgreen