Patents by Inventor Johan Christian Sundelin

Johan Christian Sundelin 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 permanent joining of tubes
    Patent number: 5738388
    Abstract: A device for permanent joining of plastic tubes intended for use as covering or lining tubes when drilling holes in the ground including a female portion on a first tube and a male portion interacting therewith on a second tube. The male portion being provided with annular projections and recesses round its outer circumference and the female portion being provided with annular projections and recesses round its inner circumference with the recesses and projections on one tube interengaging with the projections and recesses on the other tube in such a fashion that at least one of the tubes is radially deformed and the joint can withstand axial and torsional forces.
    Type: Grant
    Filed: November 4, 1996
    Date of Patent: April 14, 1998
    Assignee: Atlas Copco Craelius AB
    Inventor: Johan Christian Sundelin