Patents by Inventor Robert Heidhues

Robert Heidhues 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).

  • Tufting carpet
    Patent number: 5494723
    Abstract: A tufting carpet is described which comprises a tufting base, a pile material and a carpet back and essentially consists exclusively of polyamide 6. Through the use of a chemically uniform material in all components of the tufting carpet, the latter can be recycled as a whole for recovery of the monomeric starting material without the need for separation into the individual components, which has hitherto hampered the recycling of tufting carpets and led to major waste disposal problems.
    Type: Grant
    Filed: February 10, 1994
    Date of Patent: February 27, 1996
    Assignee: Norddeutsche Faserwerke GmbH
    Inventors: Karl-Heinz Erren, Regina Grewe, Robert Heidhues, Frank Hoppner