Patents by Inventor Jan .ANG.. Bjerngren

Jan .ANG.. Bjerngren 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 for removing degraded concrete
    Patent number: 4619551
    Abstract: A device for removing degraded concrete from a layer of concrete (11). The device includes a carrier (12) and a guide mechanism (13) on the carrier for guiding a nozzle device (14) along a path above the concrete layer. The nozzle device is provided with a noncavitating nozzle (16) which is inclined relative to the concrete layer such that the nozzle points in the direction of movement of the nozzle device for either direction of movement of the nozzle device.
    Type: Grant
    Filed: March 14, 1985
    Date of Patent: October 28, 1986
    Assignee: Atlas Copco Aktiebolag
    Inventors: Hans Juan, Jan .ANG.. Bjerngren, Carl .ANG.. Stromdahl