Patents by Inventor Holger Luethje

Holger Luethje 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).

  • Control device for non-positive connections
    Patent number: 7350419
    Abstract: The invention relates to a control device for non-positive connections, especially screw connections. The device includes two force application elements and a measuring element arranged therebetween. The measuring element is at least partially provided with a layer having a force sensory effect. The surface of the layer is provided with elevations for receiving a force applied by the force application elements.
    Type: Grant
    Filed: April 10, 2003
    Date of Patent: April 1, 2008
    Assignee: Fraunhofer-Gesellschaft zur Forderung der Angewandten Forschung E.V.
    Inventors: Holger Lüthje, Saskia Biehl, Ralf Bandorf
  • Device for adjusting and verifying the tension force of screwed connections
    Patent number: 7260997
    Abstract: The invention relates to a device for adjusting and/or verifying the axial force in screwed connections. The inventive device contains a control device for limiting an axial force acting between two force application elements of the screwed connection. To this end, the invention provides that the control device will record signal values from a measuring element whose electrical resistance varies according to the acting axial force.
    Type: Grant
    Filed: April 11, 2003
    Date of Patent: August 28, 2007
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung E.V.
    Inventors: Holger Luethje, Jan-Hinrich Sick
  • Method and device for determination of the wear resistance of a surface
    Patent number: 7013705
    Abstract: A method and apparatus for determining the wear resistance of the surface of a sample object includes an abrasive grinding belt, run between the sample object and a counter-body, with the grinding belt being pressed against the sample object with a predetermined force by the counter-body. The position of the counter-body is determined at, at least, a first position and a second position, each occurring at two different points in time. The wear resistance of the surface of the sample object is determined from the difference in determined positions.
    Type: Grant
    Filed: February 7, 2003
    Date of Patent: March 21, 2006
    Assignee: Innowep GmbH
    Inventors: Andreas Wortmann, Holger Lüthje
  • Device for adjusting and verifying the tension force of screwed connections
    Publication number: 20050155434
    Abstract: The invention relates to a device (1) for adjusting and/or verifying the axial force in screwed connections. The inventive device contains a control device for limiting an axial force acting between two force application elements of the screwed connection. To this end, the invention provides that the control device comprises means (4, 5) for recording signal values from a measuring element (2) whose electric resistance can vary according to the acting axial force.
    Type: Application
    Filed: April 11, 2003
    Publication date: July 21, 2005
    Inventors: Holger Luethje, Jan-Hinrich Sick
  • Device for applying photoresist to a base body surface
    Patent number: 6294020
    Abstract: An applicator device for applying photoresist to a surface of a base body having a receiving device therefor, including a photoresist feeder movable relative to the base body, the feeder being a point source device, and a device for performing a defined movement of the base body, comprising a conically shaped tip formed on the point source device for applying photoresist in a defined spot.
    Type: Grant
    Filed: February 19, 1999
    Date of Patent: September 25, 2001
    Assignee: Heidelberger Druckmaschinen AG
    Inventors: Holger Lüthje, Simone Daaud, Reinulf Böttcher