Patents by Inventor Hans J. Friedrich

Hans J. Friedrich 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).

  • Method of applying and bonding free-flowing bulb material to artificial grass
    Patent number: 4735825
    Abstract: The invention relates to an artificial grass, in particular for sports and playing areas, having a filling of free-flowing bulk material, in particular sand, provided between its pile threads such that the free ends of the pile threads project above the filling. According to the invention, the filling is fixed in relation to the pile threads by a bonding agent.
    Type: Grant
    Filed: July 15, 1987
    Date of Patent: April 5, 1988
    Assignee: J. F. Adolff AG
    Inventor: Hans J. Friedrich