Patents by Inventor Norman Schnittker

Norman Schnittker 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).

  • Separation process for carpets
    Patent number: 7152742
    Abstract: Comminuted carpet pieces are fed to a first stirred tank together with an aqueous solution containing separating salt, to form a first suspension, which is fed to a first mechanical separating stage. A first high-solids phase, a second high-solids phase containing polymer fiber material, and a liquid phase are obtained therefrom. The second high-solids phase is mixed with a water-containing separation solution in a stirred tank, to give a second suspension, which is fed to a second mechanical separating stage. A third high-solids phase, a polymer fiber material-rich phase and a liquid phase are withdrawn therefrom. An acid which is stronger than H2CO3 is introduced into the stirred tank together with the water-containing separation solution, and the pH of the liquid in the stirred tank is adjusted to 2–6.
    Type: Grant
    Filed: January 10, 2002
    Date of Patent: December 26, 2006
    Assignee: Zimmer AG
    Inventors: Roland Donaj, Wolfgang Dilly-Louis, Rudolf Kämpf, Norman Schnittker, Reinhard Wolf
  • Separating system for carpeted floor
    Publication number: 20040094457
    Abstract: Comminuted carpet pieces are fed to a first stirred tank together with an aqueous solution containing separating salt, to form a first suspension, which is fed to a first mechanical separating stage. A first high-solids phase, a second high-solids phase containing polymer fiber material, and a liquid phase are obtained therefrom. The second high-solids phase is mixed with a water-containing separation solution in a stirred tank, to give a second suspension, which is fed to a second mechanical separating stage. A third high-solids phase, a polymer fiber material-rich phase and a liquid phase are withdrawn therefrom. An acid which is stronger than H2CO3 is introduced into the stirred tank together with the water-containing separation solution, and the pH of the liquid in the stirred tank is adjusted to 2-6.
    Type: Application
    Filed: January 16, 2004
    Publication date: May 20, 2004
    Inventors: Roland Donaj, Wolfgang Dilly-Louis, Rudolf Kampf, Norman Schnittker, Reihard Wolf
  • Process for the synthesis of polyethylene carboxylate from polyethylene carboxylate waste
    Patent number: 5869543
    Abstract: The invention comprises a method for synthesizing polyethylene terephthalate from waste polyethylene terephthalate by cleavage with ethylene glycol and separation of bis(hydroxyethylene) terephthalate from the cleavage mixture with a specific temperature program, recrystallization from water, and esterification and polycondensation with the addition of terephthalic acid.The invention further comprises a method for synthesis of polyethylene naphthalate from waste polyethylene naphthalate in a similar manner.
    Type: Grant
    Filed: August 29, 1997
    Date of Patent: February 9, 1999
    Assignee: Zimmer Aktiengesellschaft
    Inventors: Frank Boos, Norman Schnittker, Joachim Seelig