Patents by Inventor Rolf Gunter Rosenhan

Rolf Gunter Rosenhan 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).

  • Screwdriver, screwdriver bit or the like
    Patent number: 5953969
    Abstract: A screwdriver or screwdriver bit comprising a working end with radially extending engagement surfaces profiled in particular by machining or forming. A surface layer forming a working surface due to nitriting has a hardness of at least 900 HV 0.3 or 67-68 HRC and in an intermediate layer, lying between the hard surface layer and a softer region of a core of the working end, the hardness decreases with a hardness gradient of 1500 to 3000 HV 0.3/mm.
    Type: Grant
    Filed: September 12, 1997
    Date of Patent: September 21, 1999
    Assignee: Wera Werk Hermann Werner GmbH & Co.
    Inventor: Rolf Gunter Rosenhan