Patents by Inventor Szilard Trefan

Szilard Trefan 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).

  • Process and apparatus for uprooting trees
    Patent number: 7066449
    Abstract: The subject of the invention is the excavation of trees by disrooting then by a hydraulic equipment, when the power machine (1) is connected in a rotatable manner to the timber holding frame (9), the supporting frame (3) and the elevating working cylinder (10); the timber holding frame (9) is connected to the timber holding equipment (8), wich is able to catch the timber (6) by its arms (7); the timber holding frame (9) is connected to the throwing working cylinder (5) and the supporting frame (3) is attached in a rotatable manner to the supporting cylinder (4); and in case of articulated setting-up of the supporting frame (3) the movement of the two parts of the supporting frame is done by the adjusting tool (2); then the upper part of the throwing working cylinder (5) is connect to any part of the supporting frame (3); furthermore the other end of the elevating working cylinder (10) is connected to the supporting frame (3) or in case of rigid joint setting-up of the supporting frame (3) one end of the adjus
    Type: Grant
    Filed: May 3, 2000
    Date of Patent: June 27, 2006
    Inventors: Lajos Trefan, Szabolcs Trefan, Szilard Trefan