Patents by Inventor Egon Haar

Egon Haar 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).

  • Device for equalizing changes in level between a ground area surface and a frame for a manhole cover, and a method for mounting the device
    Patent number: 6851225
    Abstract: A device for equalizing changes in level between a ground area surface extending over a ground structure and a frame for closure of an installation projecting into a ground structure therebelow, comprises a plate-shaped dragging body connected to the closure frame and projecting horizontally into the ground structure below a carrying layer thereof so as to transfer the change in level to the closure frame, the plate-shaped dragging body being a separate structural element which supports the closure frame on an upper side thereof.
    Type: Grant
    Filed: April 18, 2000
    Date of Patent: February 8, 2005
    Inventors: Egon Haar, Ernst Hackenberg