Patents by Inventor Ralf Hagmann

Ralf Hagmann 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).

  • Posterior spinal implant
    Patent number: 6077262
    Abstract: A spinal screw or hook has a slotted head to receive a support rod. A two-piece rod retainer is provided with an outer ring-like collar locked into the interior of the slotted head and a fastener extending through the collar to contact a support rod in the bottom of the slot.
    Type: Grant
    Filed: February 20, 1997
    Date of Patent: June 20, 2000
    Assignee: Synthes (U.S.A.)
    Inventors: Johannes F. Schlapfer, Martin Hess, Rene Schelker, Ralf Hagmann