Patents by Inventor Lennart Derman

Lennart Derman 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 BREAKING SOLID MATERIAL AND METHOD OF MANUFACTURING A HOSE ELEMENT FOR SUCH A DEVICE
    Publication number: 20090218877
    Abstract: A device for breaking solid material comprises an expansible hose element which is insertable into a hole in the solid material and has an externally substantially geometrically regular cross-section. At least at one of its ends, the hose element comprises a coupling. The device further comprises at least one expansion portion with an expansion chamber. The hose element further comprises an expansion limiter which has a varying radial distance from the outside of the hose element along the circumferential direction of the hose element.
    Type: Application
    Filed: February 15, 2007
    Publication date: September 3, 2009
    Applicant: EMSTONE AB
    Inventors: Karl Gustaf Derman, Lennart Derman