Patents by Inventor Gerhard Boll

Gerhard Boll 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).

  • Piston-cylinder unit
    Patent number: 7197975
    Abstract: Piston-cylinder unit including a working cylinder; a piston attached to a piston rod and installed with freedom of axial displacement in the working cylinder; and fastening elements, at least one of which is screwed into a threaded bore in the piston rod, where the interior pressure in the working cylinder holds a valve in the bore of the piston rod against an end surface of the fastening element. A vent groove leading to the atmosphere is provided between the end surface and the valve to create a pressure gradient to the working space, the groove being provided between the inner surface of the piston rod and the fastening element.
    Type: Grant
    Filed: March 16, 2005
    Date of Patent: April 3, 2007
    Assignee: ZF Friedrichshafen AG
    Inventors: Gerhard Boll, Klaus Peter Klein, Klaus Schmitz
  • Piston-cylinder unit
    Publication number: 20050217477
    Abstract: Piston-cylinder unit including a working cylinder; a piston attached to a piston rod and installed with freedom of axial displacement in the working cylinder; and fastening elements, at least one of which is screwed into a threaded bore in the piston rod, where the interior pressure in the working cylinder holds a valve in the bore of the piston rod against an end surface of the fastening element. A vent groove leading to the atmosphere is provided between the end surface and the valve to create a pressure gradient to the working space, the groove being provided between the inner surface of the piston rod and the fastening element.
    Type: Application
    Filed: March 16, 2005
    Publication date: October 6, 2005
    Inventors: Gerhard Boll, Klaus Klein, Klaus Schmitz