Patents by Inventor Jarmo Leppänen

Jarmo Leppänen 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).

  • Rock drill and method of breaking rock
    Patent number: 7942481
    Abstract: A method of breaking rock which includes the steps of drilling a hole in the rock using a drill rod; leaving the drill rod in the hole; using water flow to direct a propellant charge into the hole through a passage in the drill rod; and at a leading end of the drill rod, firing the propellant charge with, at least, the drill rod and water in the hole and passage providing a stemming function.
    Type: Grant
    Filed: March 13, 2006
    Date of Patent: May 17, 2011
    Assignee: Sandvik Mining and Construction OY
    Inventor: Jarmo Leppänen