Patents by Inventor Gerhard Graab

Gerhard Graab 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: 20080020179
    Abstract: A floor covering is provided having a high slip resistance and including a base material which is substantially in sheet or tile form and is made of an elastomeric material and which has a slip-resistant surface containing granular particles. In order to provide ease of manufacture and processing of the floor covering, the granular particles are composed of a polymeric material having a hardness significantly greater than that of the elastomeric material.
    Type: Application
    Filed: July 20, 2007
    Publication date: January 24, 2008
    Applicant: Carl Freudenberg KG
    Inventors: Gerhard Graab, Gregor Grun, Jochen Schmitt
  • Patent number: 7288308
    Abstract: A floor covering of an elastomer material having a textured surface having a plurality of unevenly distributed reliefs, which partially overlap one another and are of a rectangular or square shape having rounded corners and extents of between 1.2 and 6 mm, the height of the reliefs being between 0.01 mm and 0.1 mm.
    Type: Grant
    Filed: May 6, 2004
    Date of Patent: October 30, 2007
    Assignee: Carl Freudenberg KG
    Inventors: Gerhard Graab, Alfons Butscher, Peter Spissinger
  • Publication number: 20060121268
    Abstract: A composite panel having at least two directly contiguous layers or sections of filler-containing foamed plastics, which are each composed of thermoplastic cross-linked and closed-cell foamed material, having at least different hardness and/or color and/or density, and which are bonded to one another without the use of an adhesive. The manufacturing takes place by the foaming and cross-linking of plastic layers in a press. The composite panel is suitable for use in orthopedic technology.
    Type: Application
    Filed: March 22, 2005
    Publication date: June 8, 2006
    Applicant: Carl Freudenberg KG
    Inventors: Gerhard Graab, Juergen Schmitt, Manfred Noe
  • Patent number: 6959652
    Abstract: A table- or workbench covering made of a first electrically conductive layer having a specific resistance in the range of 5×106 ?cm to 5×109 ?cm, and a second electrically conductive layer having a specific resistance in the range of 5×104 ?cm to 5×107 ?cm, the layers being made of rubber mixtures containing antistatic agents and/or electrically conductive particles and are calendered together as well as connected by vulcanization, and which have a sulfate content of <100 ?g/cm2, extractable using deionized water.
    Type: Grant
    Filed: October 15, 2002
    Date of Patent: November 1, 2005
    Assignee: Carl Freudenberg KG
    Inventors: Hans-Michael Kühl, Gerhard Graab
  • Publication number: 20040226244
    Abstract: A floor covering of an elastomer material having a textured surface having a plurality of unevenly distributed reliefs, which partially overlap one another and are of a rectangular or square shape having rounded corners and extents of between 1.2 and 6 mm, the height of the reliefs being between 0.01 mm and 0.1 mm.
    Type: Application
    Filed: May 6, 2004
    Publication date: November 18, 2004
    Applicant: Carl Freudenberg KG
    Inventors: Gerhard Graab, Alfons Butscher, Peter Spissinger
  • Patent number: 6815042
    Abstract: A floor covering made up of at least two layers bonded to one another, including a bottom layer (2) of electrically conductive rubber arranged under a light-colored top layer (1) of rubber, where the top layer (1) is interrupted in partial areas distributed over its area in a pattern, and formed by electrically conductive rubber there. The top layer (1) is produced from a powder (1.1) of first particles (1.2) that are light in color and made of electrically insulating rubber, as well as second particles (1.3) embedded in it, which are made of electrically conductive, at least partially vulcanized rubber. The second particles (1.3) have a diameter D, determined by screen analysis, that is at least as great as the thickness D1 of the top layer and, for practical purposes, not greater than the total of the thicknesses of the top layer and the bottom layer D2. The first (1.2) and the second (1.3) particles are pressed together and to the bottom layer (2), without pores, and bonded by vulcanization.
    Type: Grant
    Filed: March 12, 2002
    Date of Patent: November 9, 2004
    Assignee: Carl Freudenberg KG
    Inventors: Gerhard Graab, Klaus Heckel
  • Publication number: 20040161589
    Abstract: A web-type floor covering made of vulcanized rubber that includes an elastic rubber web, the top side of which forms a decorative surface, first decorative particles being at least partially embedded in the rubber web so that the first decorative particles are visible from the top side, a transparent coating, in particular made of epoxy resin, being applied to the first decorative particles on at least part of their contact surface with the rubber web, the first decorative particles being preferably made of a different material from that used for the rubber web.
    Type: Application
    Filed: February 13, 2004
    Publication date: August 19, 2004
    Inventors: Gerhard Graab, Klaus Heckel, Dieter Rischer, Gerhard Heidecke
  • Publication number: 20040142163
    Abstract: An electrically conductive floor covering made of first particles of a polymer material which are surrounded with electrically conductive second particles and compressed in the intermediate space between the top and bottom sides of the floor covering, with the floor covering having at least one cut surface and the electrically conductive second particles forming conductive paths which connect the upper side and the lower side of the floor covering in an electrically conductive way, in which the first particles comprise at least one granulated elastomer material and form a matrix, in which the second particles form electric conductive paths along the particle boundaries of the first particles.
    Type: Application
    Filed: January 9, 2004
    Publication date: July 22, 2004
    Inventors: Hans-Michael Kuhl, Gerhard Graab, Peter Platzer, Ralf Moller
  • Patent number: 6709732
    Abstract: A web-type floor covering made of vulcanized rubber that includes an elastic rubber web, the top side of which forms a decorative surface, first decorative particles being at least partially embedded in the rubber web so that the first decorative particles are visible from the top side, a transparent coating, in particular made of epoxy resin, being applied to the first decorative particles on at least part of their contact surface with the rubber web, the first decorative particles being preferably made of a different material from that used for the rubber web.
    Type: Grant
    Filed: April 4, 2000
    Date of Patent: March 23, 2004
    Assignee: Firma Carl Freudenberg
    Inventors: Gerhard Graab, Klaus Heckel, Dieter Rischer, Gerhard Heidecke
  • Patent number: 6695999
    Abstract: A method to produce an electrically conductive floor covering made of first particles of a polymer material which are surrounded with electrically conductive second particles and compressed in the intermediate space between the top and bottom sides of the floor covering, with the floor covering having at least one cut surface and the electrically conductive second particles forming conductive paths which connect the upper side and the lower side of the floor covering in an electrically conductive way, in which the first particles comprise at least one granulated elastomer material and form a matrix, in which the second particles form electric conductive paths along the particle boundaries of the first particles.
    Type: Grant
    Filed: January 17, 2002
    Date of Patent: February 24, 2004
    Assignee: Firma Carl Freudenberg
    Inventors: Hans-Michael Kühl, Gerhard Graab, Peter Platzer, Ralf Möller
  • Publication number: 20030095394
    Abstract: A table- or workbench covering made of a first electrically conductive layer having a specific resistance in the range of 5×106 &OHgr;cm to 5×109 &OHgr;cm, and a second electrically conductive layer having a specific resistance in the range of 5×104 &OHgr;cm to 5×107 &OHgr;cm, the layers being made of rubber mixtures containing antistatic agents and/or electrically conductive particles and are calendered together as well as connected by vulcanization, and which have a sulfate content of <100 &mgr;g/cm2, extractable using deionized water.
    Type: Application
    Filed: October 15, 2002
    Publication date: May 22, 2003
    Inventors: Hans-Michael Kuhl, Gerhard Graab
  • Patent number: 6503424
    Abstract: A multicolored, patterned floor covering is disclosed along with a method for its manufacture. The floor covering is made of a sheeting which has a first color, and a granular material dyed differently from the sheeting which is embedded in the sheeting along at least in the area of the top side. The sheeting and the granular material consist of cross-linkable, elastomeric materials, the granular material comprising particles which have at least two subregions dyed differently from each other and from the sheeting. The quantity and color of the fractions of each component as selected so that the mixed color resulting from an homogeneous intermixing of all the components contained in the floor covering agrees with the first color.
    Type: Grant
    Filed: January 31, 2001
    Date of Patent: January 7, 2003
    Assignee: Firma Carl Freudenberg
    Inventors: Gerhard Graab, Klaus Heckel, Dieter Rischer, Thorsten Nahe, Helmut Grünhag
  • Publication number: 20020168500
    Abstract: A floor covering made up of at least two layers bonded to one another, including a bottom layer (2) of electrically conductive rubber arranged under a light-colored top layer (1) of rubber, where the top layer (1) is interrupted in partial areas distributed over its area in a pattern, and formed by electrically conductive rubber there. The top layer (1) is produced from a powder (1.1) of first particles (1.2) that are light in color and made of electrically insulating rubber, as well as second particles (1.3) embedded in it, which are made of electrically conductive, at least partially vulcanized rubber. The second particles (1.3) have a diameter D, determined by screen analysis, that is at least as great as the thickness D1 of the top layer and, for practical purposes, not greater than the total of the thicknesses of the top layer and the bottom layer D2. The first (1.2) and the second (1.3) particles are pressed together and to the bottom layer (2), without pores, and bonded by vulcanization.
    Type: Application
    Filed: March 12, 2002
    Publication date: November 14, 2002
    Inventors: Gerhard Graab, Klaus Heckel
  • Publication number: 20020102385
    Abstract: An electrically conductive floor covering made of first particles of a polymer material which are surrounded with electrically conductive second particles and compressed in the intermediate space between the top and bottom sides of the floor covering, with the floor covering having at least one cut surface and the electrically conductive second particles forming conductive paths which connect the upper side and the lower side of the floor covering in an electrically conductive way, in which the first particles comprise at least one granulated elastomer material and form a matrix, in which the second particles form electric conductive paths along the particle boundaries of the first particles.
    Type: Application
    Filed: January 17, 2002
    Publication date: August 1, 2002
    Inventors: Hans-Michael Kuhl, Gerhard Graab, Peter Platzer, Ralf Moller
  • Publication number: 20020006499
    Abstract: A homogeneous floor covering composed of elastomer, varicolored granular particles contains 3 to 20 percent by weight of a copolymer of ethylene, including at least one comonomer of vinyl esters of saturated carboxylic acids having up to 4 C-atoms in the acid group, or including at least one unsaturated mono- or dicarboxylic acid, or including at least one ester of unsaturated mono- or dicarboxylic acids having up to 8 C-atoms in the alcohol portion. In this context, the ethylene content of the copolymer is 40 to 95% percent by weight, the rest is comonomer, and the melt-flow index of the copolymer must lie between 0.1 and 50. A corresponding manufacturing process is specified.
    Type: Application
    Filed: April 12, 2001
    Publication date: January 17, 2002
    Inventors: Hans-Michael Kuhl, Gerhard Graab, Klaus Heckel
  • Publication number: 20010005542
    Abstract: A multicolored, patterned floor covering is disclosed along with a method for its manufacture. The floor covering is made of a sheeting which has a first color, and a granular material dyed differently from the sheeting which is embedded in the sheeting along at least in the area of the top side. The sheeting and the granular material consist of cross-linkable, elastomeric materials, the granular material comprising particles which have at least two subregions dyed differently from each other and from the sheeting. The quantity and color of the fractions of each component as selected so that the mixed color resulting from an homogeneous intermixing of all the components contained in the floor covering agrees with the first color.
    Type: Application
    Filed: January 31, 2001
    Publication date: June 28, 2001
    Inventors: Gerhard Graab, Klaus Heckel, Dieter Rischer, Thorsten Nahe, Helmut Grunhag
  • Patent number: 6251321
    Abstract: A homogeneous floor covering composed of elastomer, varicolored granular particles contains 3 to 20 per cent by weight of a copolymer of ethylene, including at least one comonomer of vinyl esters of saturated carboxylic acids having up to 4 C-atoms in the acid group, or including at least one unsaturated mono- or dicarboxylic acid, or including at least one ester of unsaturated mono- or dicarboxylic acids having up to 8 C-atoms in the alcohol portion. In this context, the ethylene content of the copolymer is 40 to 95% per cent by weight, the rest is comonomer, and the melt-flow index of the copolymer must lie between 0.1 and 50. A corresponding manufacturing process is specified.
    Type: Grant
    Filed: June 28, 1999
    Date of Patent: June 26, 2001
    Assignee: Carl Freudenberg
    Inventors: Hans-Michael Kühl, Gerhard Graab, Klaus Heckel
  • Patent number: 6221462
    Abstract: A multicolored, patterned floor covering is disclosed along with a method for its manufacture. The floor covering is made of a sheeting which has a first color, and a granular material dyed differently from the sheeting which is embedded in the sheeting along at least in the area of the top side. The sheeting and the granular material consist of cross-linkable, elastomeric materials, the granular material comprising particles which have at least two subregions dyed differently from each other and from the sheeting. The quantity and color of the fractions of each component as selected so that the mixed color resulting from an homogeneous intermixing of all the components contained in the floor covering agrees with the first color.
    Type: Grant
    Filed: February 17, 1995
    Date of Patent: April 24, 2001
    Assignee: Firma Carl Freudenberg
    Inventors: Gerhard Graab, Klaus Heckel, Dieter Rischer, Thorsten Nahe, Helmut Grünhag
  • Patent number: 5824735
    Abstract: A rubber moire floor covering is disclosed. The covering is produced by continuously feeding a screw-type short extruding machine having a length/diameter ratio of 6:1 with two or three varicolored strips of vulcanizable elastomeric material. The operating temperature is between 60.degree. C. to 100.degree. C. The elastomeric material leaves the extruder via a perforated disk having 200 to 600 cylindrical bore holes 3-5 mm in diameter. Each of the resulting strands is severed to produce segments that are 1 to 2 mm thick, the formed pieces are then cooled off on a section 4 meters to 6 meters long. Subsequently, the formed pieces are allowed to fall into the roll nip of a temperature controllable two-bowl calendar. The web of material leaving the calendar is fed to a continuous vulcanization installation and leaves it as finished floor covering. The material throughput rate in this continuous process may be varied from 700 kg/h up to 1300 kg/h.
    Type: Grant
    Filed: March 4, 1996
    Date of Patent: October 20, 1998
    Assignee: Firma Carl Freudenberg
    Inventors: Gerhard Graab, Klaus Heckel, Alfons Butscher, Torsten Nahe
  • Patent number: 5298210
    Abstract: The invention involves the use of about 1 to 4 %wt cured elastomer irregularly-shaped particles having a sieve size of about 0.7 mm +/-0.1 mm in uncured elastomer to suppress bubble formation without substantial loss of tensile strength, in calendered, cured elastomer products, such as, decorative or sealing sheet materials.
    Type: Grant
    Filed: December 13, 1990
    Date of Patent: March 29, 1994
    Assignee: Firma Carl Freudenberg
    Inventors: Klaus Heckel, Herbert Arnold, Gerhard Graab