Patents by Inventor Bror L. E. Rossander

Bror L. E. Rossander 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).

  • Product provided with sound damping element
    Patent number: 4296830
    Abstract: The invention relates to a product (1,9) of metal formed with a hole (5,8,17), particularly a rock drill steel, and provided with an element (10,12,14,15,16,18) for damping sound producing waves in the product annoying for the human ear. The sound damping element is arranged in the hole in the product and has a cross section less than the cross section of the hole. The damping element has at least one contact surface loosely arranged relative to the wall of the hole and located between the nodes of the waves so as to create at least one wave damping effect.
    Type: Grant
    Filed: July 10, 1979
    Date of Patent: October 27, 1981
    Assignee: Fagersta A.B.
    Inventors: Bror L. E. Rossander, Lennart C. Ermebrant, Martin Lesser