Patents by Inventor Josef Lewkowicz

Josef Lewkowicz 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).

  • Patent number: 4169520
    Abstract: The various air motors of a rock drilling rig are supplied with oil through oil lines which are furnished with predetermined metered oil flows from positive displacement pumps that are operated in synchronism with each other by an air operated oscillator. There is a normally closed shut-off valve in each oil line. The respective shut-off valve is opened when the respective air line is pressurized. When a shut-off valve is closed, the respective metered oil flow escapes through a pressure relief valve.
    Type: Grant
    Filed: May 18, 1978
    Date of Patent: October 2, 1979
    Assignee: Atlas Copco AB
    Inventors: Josef Lewkowicz, Torsten O. Larsson
  • Patent number: 4147234
    Abstract: The various air motors of a rock drilling rig are supplied with oil through oil lines which are furnished with predetermined metered oil flows from positive displacement pumps that are operated in synchronism with each other by an air operated oscillator. There is a normally closed shut-off valve in each oil line. The respective shut-off valve is opened when the respective air line is pressurized. When a shut-off valve is closed, the respective metered oil flow escapes through a pressure relief valve.
    Type: Grant
    Filed: April 21, 1976
    Date of Patent: April 3, 1979
    Assignee: Atlas Copco AB
    Inventors: Josef Lewkowicz, Torsten O. Larsson