Patents by Inventor Ernst H. Hirschel

Ernst H. Hirschel 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).

  • Wall with a drag reducing surface and method for making such a wall
    Patent number: 4907765
    Abstract: A wall having a surface in contact with a fluid, has a surface configuration which reduces drag if there is relative movement between the surface and the fluid. The wall is made of metal or of fiber composite material in such a way that sharp edged or fine ridges and grooves between the ridges are formed as integral surface components of the wall structure for simplifying the construction, reducing the weight, and increasing the useful life of structures having such walls.
    Type: Grant
    Filed: April 7, 1988
    Date of Patent: March 13, 1990
    Assignee: Messerschmitt-Boelkow-Blohm GmbH
    Inventors: Ernst H. Hirschel, Hubert Fleckenstein, Peter Thiede
  • Tail end structure for an aircraft fuselage
    Patent number: 4712751
    Abstract: The tail end structure of an aircraft has a cross-sectional configuration th laterally and downwardly extending lobes reaching outside a circular cross-section tail end structure, yet staying within the silhouette of the circular cross-section tail end structure as viewed from the top, the side, and the bottom, whereby the boundary layer formation and the boundary layer separation are improved as compared to a tail end structure having the circular cross-section.
    Type: Grant
    Filed: July 16, 1986
    Date of Patent: December 15, 1987
    Assignee: Messerschmitt-Boelkow-Blohm Gesellschaft mit beschraenkter Haftung
    Inventor: Ernst H. Hirschel