Patents by Inventor Karl-Ludwig Brentrup
Karl-Ludwig Brentrup 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).
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Publication number: 20190039329Abstract: Flexurally rigid molded parts are prepared by stacking a needled nonwoven mat of reinforcing fibers, at least one thermoplastic resin sheet and at least one surface sheet formed of a non-woven cloth comprising cloth fibers. The multilayered sheet obtained in this manner is subjected to heat and pressure followed by cooling under pressure, thereby forming a semi-finished product consisting of a consolidated laminated sheet with a porosity not exceeding 5% by volume. Upon reheating, the main body increases in thickness, thereby forming a porous laminated sheet that can be formed to a compact in a hot molding process.Type: ApplicationFiled: August 7, 2018Publication date: February 7, 2019Applicant: QUADRANT PLASTIC COMPOSITES JAPAN LTD.Inventors: Hiroshi SAKAI, Hijiri KITA, Karl-Ludwig BRENTRUP
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Publication number: 20140030491Abstract: Flexurally rigid molded parts are prepared by stacking a needled nonwoven mat of reinforcing fibers, at least one thermoplastic resin sheet and at least one surface sheet formed of a non-woven cloth comprising cloth fibers. The multilayered sheet obtained in this manner is subjected to heat and pressure followed by cooling under pressure, thereby forming a semi-finished product consisting of a consolidated laminated sheet with a porosity not exceeding 5% by volume. Upon reheating, the main body increases in thickness, thereby forming a porous laminated sheet that can be formed to a compact in a hot molding process.Type: ApplicationFiled: January 25, 2012Publication date: January 30, 2014Applicant: QUADRANT PLASTIC COMPOSITES JAPAN LTDInventors: Hiroshi Sakai, Hijiri Kita, Karl-Ludwig Brentrup
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Patent number: 8540830Abstract: A continuous method for producing a thermoplastically moldable semifinished product of a thermoplastic material and reinforcing fibers, comprises blending thermoplastic fibers and reinforcing fibers together to form a nonwoven blend, consolidating the nonwoven blend by needling or by a thermal treatment, heating the consolidated nonwoven blend to a temperature above the softening temperature of the thermoplastic, compressing the consolidated nonwoven blend successively in a heated compression mold and in a cooled compression mold at a pressure of less than 0.8 bar for at least 3 seconds, and optionally applying functional layers to the semifinished product. The preferred product is a thermoplastically moldable semifinished product of a thermoplastic material and reinforcing fibers with an average length of 20 to 60 mm and an air pore content of 35 to 65 vol %.Type: GrantFiled: March 30, 2012Date of Patent: September 24, 2013Assignee: Quadrant Plastic Composites, AGInventors: Karl Ludwig Brentrup, Harri Dittmar
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Publication number: 20120181716Abstract: A continuous method for producing a thermoplastically moldable semifinished product of a thermoplastic material and reinforcing fibers, comprises blending thermoplastic fibers and reinforcing fibers together to form a nonwoven blend, consolidating the nonwoven blend by needling or by a thermal treatment, heating the consolidated nonwoven blend to a temperature above the softening temperature of the thermoplastic, compressing the consolidated nonwoven blend successively in a heated compression mold and in a cooled compression mold at a pressure of less than 0.8 bar for at least 3 seconds, and optionally applying functional layers to the semifinished product. The preferred product is a thermoplastically moldable semifinished product of a thermoplastic material and reinforcing fibers with an average length of 20 to 60 mm and an air pore content of 35 to 65 vol %.Type: ApplicationFiled: March 30, 2012Publication date: July 19, 2012Applicant: QUADRANT PLASTIC COMPOSITES AGInventors: Karl-Ludwig Brentrup, Harri Dittmar
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Patent number: 8043542Abstract: Low density and acoustically absorbing panels are produced by consolidation in a mold of a heated part of a pre-cut, lofty, semi-finished product containing polypropylene fibers and reinforcing fibers and having an air pore content of 20 to 80 vol.-% wherein overlapping with the periphery of the pre-cut part are heated strips of polypropylene optionally containing up to 60 wt.-% reinforcing fibers, but containing 5 vol.-% or less of air pores.Type: GrantFiled: February 19, 2008Date of Patent: October 25, 2011Assignee: Quadrant Plastic Composites, AGInventors: Eberhard Pfeiffer, Harri Dittmar, Karl-Ludwig Brentrup
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Publication number: 20100297414Abstract: A composite sheet has cover layers of high pressure laminate sheets A and a core layer B arranged therebetween. The core layer is formed for an air pore-containing, fiber reinforced thermoplastic and is adhesively bonded to the cover layers by an anhydrous adhesive which is mechanically anchored in surface pores of the core layer B.Type: ApplicationFiled: September 11, 2008Publication date: November 25, 2010Applicant: QUADRANT PLASTIC COMPOSITES AGInventors: Karl-Ludwig Brentrup, Uwe Rothenberger, Nicola Adamo, Chiara Zaniboni
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Publication number: 20100116407Abstract: A continuous method for producing a thermoplastically moldable semifinished product of a thermoplastic material and reinforcing fibers, comprises blending thermoplastic fibers and reinforcing fibers together to form a nonwoven blend, consolidating the nonwoven blend by needling or by a thermal treatment, heating the consolidated nonwoven blend to a temperature above the softening temperature of the thermoplastic, compressing the consolidated nonwoven blend successively in a heated compression mold and in a cooled compression mold at a pressure of less than 0.8 bar for at least 3 seconds, and optionally applying functional layers to the semifinished product. The preferred product is a thermoplastically moldable semifinished product of a thermoplastic material and reinforcing fibers with an average length of 20 to 60 mm and an air pore content of 35 to 65 vol %.Type: ApplicationFiled: January 18, 2010Publication date: May 13, 2010Applicant: QUADRANT PLASTIC COMPOSITES AGInventors: Karl Ludwig Brentrup, Harri Dittmar
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Publication number: 20100032870Abstract: Low density and acoustically absorbing panels are produced by consolidation in a mold of a heated part of a pre-cut, lofty, semi-finished product containing polypropylene fibers and reinforcing fibers and having an air pore content of 20 to 80 vol.-% wherein overlapping with the periphery of the pre-cut part are heated strips of polypropylene optionally containing up to 60 wt.-% reinforcing fibers, but containing 5 vol.-% or less of air pores.Type: ApplicationFiled: February 19, 2008Publication date: February 11, 2010Applicant: QUADRANT PLASTIC COMPOSITES AGInventors: Eberhard Pfeiffer, Harri Dittmar, Karl-Ludwig Brentrup
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Publication number: 20080160272Abstract: Rigid yet lightweight composite sheets contain a core layer formed by thermal consolidation of a needled non-woven mat of glass fibers and polypropylene fibers, optionally with a melt-bonded polypropylene film on at least one side thereof, sandwiched between layers of GMT. The core contains from 20 to 80 volume percent air voids, whereas the GMT outer layers have a very low or zero void content. The composite sheets may be used for structural panels, for fabricating furniture, and for other uses.Type: ApplicationFiled: December 13, 2007Publication date: July 3, 2008Applicant: QUADRANT PLASTIC COMPOSITES AGInventors: Karl-Ludwig Brentrup, Andreas Keilbach
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Publication number: 20060244170Abstract: A continuous method for producing a thermoplastically moldable semifinished product of a thermoplastic material and reinforcing fibers, comprises blending thermoplastic fibers and reinforcing fibers together to form a nonwoven blend, consolidating the nonwoven blend by needling or by a thermal treatment, heating the consolidated nonwoven blend to a temperature above the softening temperature of the thermoplastic, compressing the consolidated nonwoven blend successively in a heated compression mold and in a cooled compression mold at a pressure of less than 0.8 bar for at least 3 seconds, and optionally applying functional layers to the semifinished product. The preferred product is a thermoplastically moldable semifinished product of a thermoplastic material and reinforcing fibers with an average length of 20 to 60 mm and an air pore content of 35 to 65 vol %.Type: ApplicationFiled: April 4, 2006Publication date: November 2, 2006Applicant: Quadrant Plastic Composites AGInventors: Karl-Ludwig Brentrup, Harri Dittmar
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Publication number: 20060013990Abstract: A textile product as subject of the invention comprises at least one layer of non-metallic fibers and metal cords. The textile fabric is characterized in that the metal cords are bond to this layer of non-metallic fibers by means of stitches.Type: ApplicationFiled: June 3, 2005Publication date: January 19, 2006Inventors: Karl-Ludwig Brentrup, Harri Dittmar, Erwin Lokere, Jeroen Gallens
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Patent number: 5827460Abstract: A fiber composite is produced by continuously pressing together a thermoplastic melt and a glass fiber mat or tape in a double belt press and cooling the composite under pressure. The double belt press is sealed off on both sides by endless, traveling belts made of a compressible material.Type: GrantFiled: April 21, 1997Date of Patent: October 27, 1998Assignee: BASF AktiengesellschaftInventors: Karl-Ludwig Brentrup, Friedrich Heinrich Erfmann
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Patent number: 5476628Abstract: Semi-finished GMT sheet material of GMT recyclate in which more than 50% by weight of the glass fibers are more than 2 mm in length and which is produced by extruding GMT recyclate particles without significant comminution of the glass fibers.Type: GrantFiled: September 9, 1994Date of Patent: December 19, 1995Assignee: BASF AktiengesellschaftInventors: Horst Baumgartl, Karl-Ludwig Brentrup, Jurgen Hofmann, Peter Ittemann, Rainer Nachtrab, Hilmar Ohlig, Alois Schlarb
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Patent number: 5340642Abstract: In a sheetlike composite comprising a polyolefin matrix and natural fiber mats as reinforcement the natural fibers have a basis weight of more than 10 dtex. Sisal fibers are preferred. The composites are used in particular in automotive construction.Type: GrantFiled: March 8, 1993Date of Patent: August 23, 1994Assignee: BASF AktiengesellschaftInventors: Horst Baumgartl, Alois Schlarb, Ludwig Wahl, Peter Ittemann, Karl-Ludwig Brentrup