Patents by Inventor Leif S. Johansson

Leif S. Johansson 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).

  • Frame construction for string instruments
    Patent number: 4423656
    Abstract: The invention relates to a modular frame construction for string instruments. Instead of making the frame of the string instrument in one piece, the frame according to this invention is assembled from a number of modules which each comprise a longitudinal tubular member of square cross-section on which strings are supported under tension.
    Type: Grant
    Filed: October 29, 1981
    Date of Patent: January 3, 1984
    Inventor: Leif S. Johansson
  • Hearing protector
    Patent number: D668392
    Type: Grant
    Filed: April 28, 2011
    Date of Patent: October 2, 2012
    Assignee: 3M Innovative Properties Company
    Inventors: Lars G. E. Carlborg, Johan Rapp, Leif S. Johansson, Martin L. Birath, August H. Michael, Oskar E. Juhlin
  • Hearing protector
    Patent number: D671273
    Type: Grant
    Filed: April 28, 2011
    Date of Patent: November 20, 2012
    Assignee: 3M Innovative Properties Company
    Inventors: Lars G. E. Carlborg, Johan Rapp, Leif S. Johansson, Martin L. Birath, August H. Michael, Oskar E. Juhlin