Patents by Inventor Willi Schwarz

Willi Schwarz 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).

  • Publication number: 20070179230
    Abstract: To prevent packaging materials made of thermoplastic polymers from adhering to pasty and fatty foods, a nonstick composition comprising a fatty acid ester of a polyhydric alcohol having at least one fatty acid radical per ester molecule with 19 or more carbon atoms is incorporated into at least one selected area of a polymer packaging material. Even if included only in surface-close regions or layers of the packaging material, a permanent nonstick effect is observed.
    Type: Application
    Filed: January 16, 2007
    Publication date: August 2, 2007
    Inventors: Bernd SPERLICH, Willi SCHWARZ, Hans WUNDERLICH
  • Patent number: 6749948
    Abstract: A peelable, biaxially oriented, transparent multilayer polyolefin film having at least three layers is described. The peelable, biaxially oriented, transparent multilayer polyolefin film, comprises: (a) a transparent polyolefin base layer; (b) at least one peelable outer layer comprising one of, (i) a polymer selected from at least one of LLDPE, LDPE, MDPE, ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer and HDPE, and (ii) a combination of at least one propylene co- or terpolymer and at least one ethylenic polymer; and (c) at least one intermediate layer comprising a propylene co- or terpolymer. The intermediate layer (c) of the multilayer film is interposed between the base layer (a) and the peelable layer (b). Also described is a method of preparing the multilayer film, which results in the base layer and intermediate layer(s) being biaxially stretched, and the peelable layer(s) being monoaxially stretched. The multilayer films of the present invention have utility as packaging films.
    Type: Grant
    Filed: May 14, 2002
    Date of Patent: June 15, 2004
    Assignee: Wipak Walsrode GmbH Co. & KG
    Inventors: Bernd Sperlich, Hans Wunderlich, Helmut Wagner, Willi Schwarz
  • Patent number: 6645609
    Abstract: Described is a stretched multilayered film comprising: (a) a polyolefin layer; and (b) at least one peelable outer layer. Each peelable outer layer (b) independently is 0.5 to 5 &mgr;m thick, comprises a copolymer of vinyl acetate and ethylene, and has a vinyl acetate proportion of from 3 to 30 wt. %, based on the weight of the peelable outer layer (b). Also described is a method of using the multilayered film as a packaging film.
    Type: Grant
    Filed: June 13, 2001
    Date of Patent: November 11, 2003
    Assignee: Wolff Walsrode AG
    Inventors: Bernd Sperlich, Helmut Wagner, Willi Schwarz, Hans Wunderlich
  • Publication number: 20030068514
    Abstract: A peelable, biaxially oriented, transparent multilayer polyolefin film having at least three layers is described. The peelable, biaxially oriented, transparent multilayer polyolefin film, comprises: (a) a transparent polyolefin base layer; (b) at least one peelable outer layer comprising one of, (i) a polymer selected from at least one of LLDPE, LDPE, MDPE, ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer and HDPE, and (ii) a combination of at least one propylene co- or terpolymer and at least one ethylenic polymer; and (c) at least one intermediate layer comprising a propylene co- or terpolymer. The intermediate layer (c) of the multilayer film is interposed between the base layer (a) and the peelable layer (b). Also described is a method of preparing the multilayer film, which results in the base layer and intermediate layer(s) being biaxially stretched, and the peelable layer(s) being monoaxially stretched. The multilayer films of the present invention have utility as packaging films.
    Type: Application
    Filed: May 14, 2002
    Publication date: April 10, 2003
    Inventors: Bernd Sperlich, Hans Wunderlich, Helmut Wagner, Willi Schwarz
  • Patent number: 6489038
    Abstract: A multi-layered film that may be heat laminated to a substrate is described. The multi-layered film comprises a base layer comprising polypropylene, a first external layer comprising polypropylene, and a second external layer. The base layer is interposed between the first and second external layers. The second external layer comprises a mixture of first (i) and second (ii) ethylene vinyl acetate (EVA) copolymers, each having different vinyl acetate residue contents. The content of vinyl acetate residues in the first EVA copolymer (i) is 10 to 30 percent by weight, based on the weight of the first copolymer (i), the content of vinyl acetate residues in the second EVA copolymer (ii) is 1 to 10 percent by weight, based on the weight of the second copolymer (ii). The multi-layered film is heat laminated and oriented at least monoaxially.
    Type: Grant
    Filed: August 4, 2000
    Date of Patent: December 3, 2002
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Bernd Sperlich, Willi Schwarz
  • Publication number: 20020022125
    Abstract: Described is a stretched multilayered film comprising: (a) a polyolefin layer; and (b) at least one peelable outer layer. Each peelable outer layer (b) independently is 0.5 to 5 &mgr;m thick, comprises a copolymer of vinyl acetate and ethylene, and has a vinyl acetate proportion of from 3 to 30 wt. %, based on the weight of the peelable outer layer (b). Also described is a method of using the multilayered film as a packaging film.
    Type: Application
    Filed: June 13, 2001
    Publication date: February 21, 2002
    Inventors: Bernd Sperlich, Helmut Wagner, Willi Schwarz, Hans Wunderlich
  • Publication number: 20010053441
    Abstract: Described is a multi-layer composite film comprising, (a) a biaxially oriented polypropylene film as a base film; (b) at least one polyolefin film superposed over said biaxially oriented polypropylene film; and (c) a colorant deposited on the polyolefin film. The colorant is interposed between the biaxially oriented polypropylene film and at least one of the superposed polyolefin films, and the thickness of the multi-layer composite film ranges between 8 &mgr;m and 26 &mgr;m. Also described are a method of producing the multi-layer composite film, and a method of using the multi-layer composite film as a packaging material.
    Type: Application
    Filed: May 4, 2001
    Publication date: December 20, 2001
    Inventors: Bernd Sperlich, Helmut Wagner, Willi Schwarz, Hans Wunderlich
  • Patent number: 4965975
    Abstract: Means for erecting a wall of preferably disc-like wall blocks, particularly glass blocks, having marginal support portions adjacent the wall surfaces limiting the bearing sides of the blocks, an offset surface being located between the support portions. A flat strip is located between the offset surfaces of superimposed or adjacent wall blocks which is made preferably of tension material. Support pieces are connected to the flat strip or are integrally formed therewith, the support pieces having a suitable support section adapted to be located between superimposed or adjacent support portions.
    Type: Grant
    Filed: March 6, 1989
    Date of Patent: October 30, 1990
    Inventor: Willi Schwarz