Patents by Inventor STEFAN HORNFECK

STEFAN HORNFECK 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).

  • Rotary pencil
    Patent number: 8696226
    Abstract: A rotary pencil includes a sleeve-shaped shaft having a front end and a rear end, a threaded spindle mounted to be fixed against rotation and axially movable in said shaft and having an at least single-start external thread. At least one threaded element is fixed in axial and rotating directions relative to the shaft and engages into the external thread. The front end of the external thread is adjoined by a cylindrical spindle section which extends over the entire circumference of the spindle, namely a free-running section, and has an external diameter corresponding to a core diameter of the external thread.
    Type: Grant
    Filed: September 7, 2010
    Date of Patent: April 15, 2014
    Assignee: Faber-Castell AG
    Inventor: Stefan Hornfeck
  • ROTARY PENCIL
    Publication number: 20110058887
    Abstract: A rotary pencil includes a sleeve-shaped shaft having a front end and a rear end, a threaded spindle mounted to be fixed against rotation and axially movable in said shaft and having an at least single-start external thread. At least one threaded element is fixed in axial and rotating directions relative to the shaft and engages into the external thread. The front end of the external thread is adjoined by a cylindrical spindle section which extends over the entire circumference of the spindle, namely a free-running section, and has an external diameter corresponding to a core diameter of the external thread.
    Type: Application
    Filed: September 7, 2010
    Publication date: March 10, 2011
    Applicant: FABER-CASTELL AG
    Inventor: STEFAN HORNFECK