Patents by Inventor Ralf Krotz

Ralf Krotz 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).

  • Bone sealants
    Patent number: 6420454
    Abstract: The present invention relates to improved bone sealants for staunching local haemorrhages on bones, which are characterized in that the bone sealant consists of a polyester oligomer synthesized from polyol, lactide and glycolide, and water-soulble polymers.
    Type: Grant
    Filed: December 3, 1999
    Date of Patent: July 16, 2002
    Assignee: Merck Patent Gesellschaft
    Inventors: Robert Wenz, Ralf Krotz, Wolfgang Ritter
  • A cylinder for mixing components to form bone cement
    Patent number: 5551778
    Abstract: A device for mixing and discharging bone cement has a mixing cylinder which consists of two cylinder parts and in which an openworked mixing plunger can be moved axially. The lower cylinder part is sealed off by a discharging plunger. A separating plunger is arranged axially displaceably in the mixing cylinder between the mixing plunger and the discharging plunger, which separating plunger seals off the one cylinder part before the two cylinder parts are connected. The separating plunger has through-flow channels through which a liquid monomer can flow from the lower cylinder part to a pulverulent polymer in the upper cylinder part at the start of the mixing procedure.
    Type: Grant
    Filed: July 14, 1995
    Date of Patent: September 3, 1996
    Assignee: Merck Patent Gesellschaft Mit Berschrankter Haftung
    Inventors: Gunter Hauke, Rainer Specht, Ralf Krotz, Reiner Funk, Peter Martin, Berthold Nies