Patents by Inventor Karl-Erik H. Mattsson

Karl-Erik H. Mattsson 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).

  • Cylinder with two-stage movement, especially a welding cylinder
    Patent number: 4296679
    Abstract: In a cylinder with a two-stage movement, a first piston moves in a housing, and in the first piston a second piston moves, which has a piston rod sliding in an end of the housing. On its side facing away from the piston rod, the second piston is provided with a guide member which is guided in the first piston. The first piston can be held in a position in which the piston rod is extended far out of the housing. With the aid of the second piston, the piston rod can perform a certain axial movement relative to the first piston, at the same time as guiding is effected with the aid of the guide member and the first piston.
    Type: Grant
    Filed: October 31, 1979
    Date of Patent: October 27, 1981
    Assignee: AB Volvo
    Inventor: Karl-Erik H. Mattsson