Patents by Inventor Dirk Förstner

Dirk Förstner 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).

  • Handheld work apparatus
    Patent number: 9138884
    Abstract: A handheld work apparatus has an electric drive motor (24) and a power supply unit for the drive motor (24). The power supply unit is arranged in a receptacle (7) of a housing (2) of the work apparatus. The work apparatus has an electronic control (17) and a blower wheel (29) for conveying cooling air. The blower wheel (29) is driven by a drive motor (24). The housing (2) has at least one air inlet opening (10) for cooling air via which the blower wheel (29) draws in a first cooling air flow (22) during operation. A second cooling air flow (23) is drawn into the housing (2) via the receptacle (7).
    Type: Grant
    Filed: September 12, 2011
    Date of Patent: September 22, 2015
    Assignee: Andreas Stihl AG & Co. KG
    Inventors: Georg Heinzelmann, Gernot Liebhard, Dirk Förstner
  • HANDHELD WORK APPARATUS
    Publication number: 20120066916
    Abstract: A handheld work apparatus has an electric drive motor (24) and a power supply unit for the drive motor (24). The power supply unit is arranged in a receptacle (7) of a housing (2) of the work apparatus. The work apparatus has an electronic control (17) and a blower wheel (29) for conveying cooling air. The blower wheel (29) is driven by a drive motor (24). The housing (2) has at least one air inlet opening (10) for cooling air via which the blower wheel (29) draws in a first cooling air flow (22) during operation. A second cooling air flow (23) is drawn into the housing (2) via the receptacle (7).
    Type: Application
    Filed: September 12, 2011
    Publication date: March 22, 2012
    Inventors: Georg Heinzelmann, Gernot Liebhard, Dirk Förstner