1
Karin Buettner Janz, Bernd Derr, Klaus Peter Erkel, Hans Joachim Helisch, Kurt Schellnack, Roland Schumann: Intervertebral disc endoprosthesis. Humboldt Universitaet zu Berlin, Jordan and Hamburg, July 26, 1988: US04759766 (663 worldwide citation)

An intervertebral disc endoprothesis comprises two symmetrical, concave end plates with an intermediate convex spacing piece. The end plates and the spacing piece have a plane guide rim. The end plates either have an edge shoulder or an annular groove for a toroid provided on the spacing piece. Alte ...


2
Roland Schumann: Lengthwise folding arrangement with vertically adjustable conical tip folding mandrel. Veb Kombinat Polygraph Werner Lamberz Leipzig, Michael J Striker, August 26, 1986: US04607830 (6 worldwide citation)

A lengthwise folding arrangement for webs has a drawing-in roller, a horizontal guiding plate which forms a folding edge, a folding mandrel arranged under a plane of a web edge extending between the drawing-in roller and a withdrawing roller, a conical tip provided on the folding mandrel forming a h ...