Patents by Inventor Ralf Schledjewski

Ralf Schledjewski 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).

  • Patent number: 6524712
    Abstract: A multilayer film is described which has at least one first layer (1) of thermoplastic polyurethane, at least one second layer (2) of thermoplastic elastomer, and optionally a third layer (3) of thermoplastic polyurethane. The ratio of the water vapor permeability level of the first layer (1) to the water vapor permeability level of the second layer (2), of the multilayer film is at least two. When the optional third layer (3) is present in the multilayer film, the first and third layers enclose the second layer. Also described are filled articles (e.g., water beds and hot/cold pads), which are fabricated from the multilayer films of the present invention.
    Type: Grant
    Filed: April 4, 2001
    Date of Patent: February 25, 2003
    Assignee: Wolff Walsrode AG
    Inventors: Ralf Schledjewski, Antoine Cassel, Rainer Brandt, Aileen Craig
  • Patent number: 6455618
    Abstract: Described is a thermoplastic molding composition comprising: a) 0.05 to 1.5 wt. %, with respect to the entire molding composition, of a fatty acid amide ester wax; b) 0.5 to 10 wt. %, with respect to the entire molding composition, of a silica selected from natural silica, synthetic silica and mixtures thereof; c) 0 to 1 wt. %, with respect to the entire molding composition, of a montan wax; and d) at least one thermoplastic elastomer. Also described are a method of preparing the thermoplastic molding composition, and methods of preparing articles from the thermoplastic molding composition.
    Type: Grant
    Filed: June 7, 2001
    Date of Patent: September 24, 2002
    Assignee: Wolff Walsrode AG
    Inventors: Ralf Schledjewski, Hans-Werner Funk, Dirk Schultze, Rainer Brandt
  • Publication number: 20020010240
    Abstract: Described is a thermoplastic molding composition comprising: a) 0.05 to 1.5 wt. %, with respect to the entire molding composition, of a fatty acid amide ester wax; b) 0.5 to 10 wt. %, with respect to the entire molding composition, of a silica selected from natural silica, synthetic silica and mixtures thereof; c) 0 to 1 wt. %, with respect to the entire molding composition, of a montan wax; and d) at least one thermoplastic elastomer. Also described are a method of preparing the thermoplastic molding composition, and methods of preparing articles from the thermoplastic molding composition.
    Type: Application
    Filed: June 7, 2001
    Publication date: January 24, 2002
    Inventors: Ralf Schledjewski, Hans-Werner Funk, Dirk Schultze, Rainer Brandt
  • Patent number: 6331355
    Abstract: The invention provides a monolayered thermoplastic hot-melt adhesive film without a separating layer which can be rolled up and unrolled without the additional use of a separating layer and in which the polymer matrix of copolyamides and/or copolyesters contains an additive combination of 0.4 wt. % to 8.0 wt. % of a spacer and 0.05 wt. % to 1.0 wt. % of a separating and lubricating agent, and optionally up to 1 wt. % of other additives, each with respect to the total mixture.
    Type: Grant
    Filed: December 9, 1999
    Date of Patent: December 18, 2001
    Assignee: Wolff Walsrode AG
    Inventors: Heiko Tebbe, Ralf Schledjewski, Dirk Schultze
  • Patent number: 6251968
    Abstract: The present invention relates to a method for modifying articles and/or semi-finished products made from polymer resin moulding compositions, wherein said articles and/or semi-finished products, which substantially consist of moulding compositions comprising mixtures of thermoplastic polymers where exhibit good biodegradability and thermoplastic polymers which exhibit poor biodegradability, are subjected to biodegradation.
    Type: Grant
    Filed: August 16, 1999
    Date of Patent: June 26, 2001
    Assignee: Wolfe Walsrode AG
    Inventors: Ralf Schledjewski, Dirk Schultze, Gunter Weber, Rainhard Koch
  • Patent number: 5866257
    Abstract: The present invention relates to a multilayer film having at least one layer substantially formed from thermoplastic polyurethanes, and at least one further layer, formed from an olefin-based polymer coupling agent, which contains maleic anhydride as a formulation component and the Vicat softening temperature of which, measured to ASTM D 1525, is less than 60.degree. C.
    Type: Grant
    Filed: November 6, 1997
    Date of Patent: February 2, 1999
    Assignee: Wolff Walsrode AG
    Inventors: Ralf Schledjewski, Dirk Schultze, Nicole Hargarter