Patents by Inventor Bernhard Maidl

Bernhard Maidl 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).

  • Patent number: 4761099
    Abstract: The present invention is directed to a process for strengthening and sealing geological formations which are moist or contain water, in particular loose stone, by the injection of a mixture which reacts to form polyurethane, characterized in that a polyisocyanate component is injected before injection of the reaction mixture.
    Type: Grant
    Filed: March 27, 1987
    Date of Patent: August 2, 1988
    Assignees: Bayer Aktiengesellschaft, Bergwerksverband GmbH
    Inventors: Max Mann, Manfred Kapps, Frank Meyer, Hans Mehesch, Wolfgang Cornely, Bernhard Maidl, Dietrich Stein, Knud Gerdes
  • Patent number: 4652174
    Abstract: The manufacture of extended, inaccessible holes for underground ducts, conduits and the like is performed by a closed construction process, wherein the preferably remotely-controlled excavation is performed and following that a structure is installed which is employed as the product duct, conduit or the like. The installed structure is provided by injection of an injection material under pressure into an annular space between a form following the excavating apparatus and the ground to manufacture at least one endless inner wall for the hole which then serves as the underground duct, conduit or the like. The novel apparatus of this invention correspondingly comprises a form following the required excavation mechanism conformed to form an annular space between the form and the ground, that form having a form front closing the form and at least one inlet therein for injection of an injection material into the annular space.
    Type: Grant
    Filed: February 4, 1985
    Date of Patent: March 24, 1987
    Assignee: Bergwerksverband GmbH
    Inventors: Wolfgang Cornely, Dietrich Stein, Bernhard Maidl, Karl Kubicki