Patents by Inventor Roland Ehmsen

Roland Ehmsen 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).

  • Seal for a reciprocating rod
    Patent number: 5346230
    Abstract: A seal for a reciprocating rod, comprised of a sealing ring of elastomeric material, which is provided at its end facing away from the space to be sealed off with a recess that opens towards the rod and in the direction of the end, into which a guide ring is inserted. At a distance from the end, the guide ring is provided with one radially outwardly pointing projection which is snapped into the sealing ring. The sealing ring is undetachably secured to the guide ring during storage and assembly.
    Type: Grant
    Filed: March 18, 1993
    Date of Patent: September 13, 1994
    Assignee: Firma Carl Freudenberg
    Inventors: Herbert Schumacher, Roland Ehmsen, Werner Trauth
  • Ferrofluid seal for a shaft
    Patent number: 5092611
    Abstract: A ferrofluid seal for a shaft comprising several sealing gaps concentrically arrayed about a shaft. Each gap is filled with ferrofluid liquid through a bore-hole. Each of the bore-holes is sealed and hydraulically isolated from the other bore-holes.
    Type: Grant
    Filed: July 5, 1990
    Date of Patent: March 3, 1992
    Assignee: Firma Carl Freudenberg
    Inventors: Roland Ehmsen, Ulrich Fruedenberg, Fritz Heck, Rolf Vogt