Patents by Inventor Eric T. Lindberg

Eric T. Lindberg 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).

  • Control method and control device for a down-the-hole rock drill
    Patent number: 4653593
    Abstract: When drilling deep boreholes with a down-the-hole drill (15), the pressure and the flow of the motive fluid are controlled so that the impact velocity of the piston hammer of the drill is kept within narrow limits independently of the counter pressure in the borehole. For this purpose the quotient of pressure and flow can be held substantially constant.
    Type: Grant
    Filed: July 5, 1985
    Date of Patent: March 31, 1987
    Assignee: Atlas Copco Aktiebolag
    Inventor: Eric T. Lindberg
  • Pneumatically operated impact tool
    Patent number: 4496023
    Abstract: A plastic silencer (12) surrounds a compressed air tool (11) and forms an exhaust chamber (27) around the tool. Two exhaust tubes (31, 32) from the chamber (27) are to the greater part situated in the chamber. A number of holes (35, 36) have been drilled near the inlet ends of the tubes. As a result the building up of ice in the inlet is prevented.
    Type: Grant
    Filed: September 12, 1983
    Date of Patent: January 29, 1985
    Assignee: Atlas Copco Aktiebolag
    Inventors: Eric T. Lindberg, Anna M. Friedman