Patents by Inventor Johannes Wassen

Johannes Wassen 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).

  • Apparatus for forming a split tube
    Patent number: 4403491
    Abstract: A die member has a conical bore with a cylindrical extension, and a shallow groove in the conical bore; a conical mandrel with a cylindrical extension fills the conical bore, except for the groove which merges into an annular space between the cylindrical bore and the extension. A metal strip is pulled through the groove and the space is to be folded into a split tube.
    Type: Grant
    Filed: November 2, 1981
    Date of Patent: September 13, 1983
    Assignee: Mannesmann Aktiengesellschaft
    Inventors: Johannes Wassen, Siegfried Honisch
  • Drawing hollow blanks in multiple steps
    Patent number: 4217770
    Abstract: Plural dies for stepwise drawing a hollow blank on a mandrel are spaced so that a downstream die is placed at a location where the drawing strain from the previous die has been reduced to zero because the tensile stress in the deforming zone is balanced by adhesion to the mandrel.
    Type: Grant
    Filed: September 11, 1978
    Date of Patent: August 19, 1980
    Assignee: Mannesmann Aktiengesellschaft
    Inventor: Johannes Wassen