Patents by Inventor Hartmut Ruf
Hartmut Ruf 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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Patent number: 6793689Abstract: The present disclosure relates to novel dyed cellulosic moulded bodies, in particular to fibers or films, containing a heavy-metal-containing colorant, which, according to the thermal stability test described herein, reduces the rise temperature of a cellulose solution in a tertiary amine oxide by 10° C. at most, in particular by 5° C. at most. The moulded bodies according to the disclosure may be produced in accordance with the amine-oxide process.Type: GrantFiled: February 8, 2002Date of Patent: September 21, 2004Assignee: Lenzing AktiengesellschaftInventor: Hartmut Rüf
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Publication number: 20030173700Abstract: The invention relates to a process for the production of cellulosic fibres by extruding a solution of cellulose in a tertiary amine oxide through spinning holes of a spinning nozzle and conducting the extruded filaments into a precipitation bath via an air gap while they are drawn off, the filaments in the air gap being exposed to the flow of a gas. The invention is characterized in that for the temperature (T) of the gas before the contact with the filaments 60° C.<T<90° C. is correct.Type: ApplicationFiled: December 27, 2002Publication date: September 18, 2003Inventors: Hartmut Ruf, Christoph Schrempf
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Publication number: 20030000662Abstract: The invention is concerned with a process for the production of cellulose molded bodies exhibiting high brightness, which is characterized by a combination of the steps ofType: ApplicationFiled: August 27, 2002Publication date: January 2, 2003Inventors: Hartmut Ruf, Dieter Eichinger, Gabriele Schild, Wilhelm Feilmair
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Publication number: 20020189035Abstract: The present invention relates to novel dyed cellulosic molded bodies, in particular to fibers or films, containing a heavy-metal-containing colorant, which, according to the thermal stability test described above, reduces the rise temperature of a cellulose solution in a tertiary amine oxide by 10° C. at most, in particular by 5° C. at most. The molded bodies according to the invention may be produced in accordance with the amine-oxide process (FIG. 1).Type: ApplicationFiled: February 8, 2002Publication date: December 19, 2002Applicant: LENZING AKTIENGESELLSCHAFTInventor: Hartmut Ruf
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Patent number: 6241927Abstract: The invention relates to a method of producing lyocell-type cellulose fibers by processing a spinnable solution of cellulose in an aqueous tertiary amine oxide according to the dry/wet-spinning process, which method is characterized in that a solution having a content of between 0.05% and 0.70% by mass, based on the mass of the solution, of cellulose with a molecular weight of at least 5×105 is used for spinning. The method of the invention allows the use of a spinnerette having more than 10,000 spinning holes for the spinning operation, which holes are arranged in such a manner that neighboring spinning holes are spaced maximally 3 mm apart and that the linear density of the spinning holes it at least 20.Type: GrantFiled: February 3, 1999Date of Patent: June 5, 2001Assignee: Lenzing AktiengesellschaftInventors: Eduard Mülleder, Christoph Schrempf, Hartmut Rüf, Wilhelm Feilmair
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Patent number: 6130327Abstract: The invention relates to flame-retardant regenerated celluloses which contain at least one compound of formula I: ##STR1## The subject matter of the invention is also the use of compounds of formula I as a flame-retardant agent especially for regenerated celluloses and a process for the flame-retardant finishing of regenerated cellulose which is characterized by mixing in compounds of formula I or a dispersion containing one of these compounds.Type: GrantFiled: March 23, 1998Date of Patent: October 10, 2000Assignee: Lenzing AktiengeselleschaftInventors: Rainer Wolf, Hartmut Ruf
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Patent number: 5968434Abstract: To prepare cellulose mouldings, a solution of cellulose in a tertiary amine-oxide is moulded in a hot state and the moulded solution is introduced into a precipitation bath in order to precipitate the contained cellulose, wherein the hot moulded solution is cooled before introduction into the precipitation bath. Cooling occurs immediately after the moulding process and preferably consists of blowing air horizontally on to the cellulose moulding. The process according to the invention allows spinning of the cellulose solution with a high fiber density without the spun fibers sticking together after emerging from the spinneret. In spite of the high fiber density, it furthermore allows the use of a long air gap between the spinneret and the precipitation bath, by which means sufficient time is generated in the spinning process to affect the textile properties of the fibers by drawing at the die (FIG. 1).Type: GrantFiled: June 10, 1998Date of Patent: October 19, 1999Assignee: Lenzing AktiengesellschaftInventors: Stefan Zikeli, Ernst Rauch, Hermann Koberger, Friedrich Ecker, Hartmut Ruf, Raimund Jurkovic, Franz Schwenninger
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Patent number: 5863478Abstract: The invention is concerned with a process for the production of cellulose fibers wherein a solution of cellulose in a tertiary amine-oxide is extruded through spinning holes of a spinneret, whereby filaments are extruded, the extruded filaments are conducted across an air gap, a precipitation bath and a drawing device whereby the filaments are drawn, the drawn filaments are further processed into cellulose fibers, the drawn filaments being exposed during further processing to a tensile stress in longitudinal direction not exceeding 5.5 cN/tex.Type: GrantFiled: October 30, 1997Date of Patent: January 26, 1999Assignee: Lenzing AktiengesellschaftInventors: Hartmut Ruf, Christoph Schrempf
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Patent number: 5827463Abstract: The disclosure describes a process for the manufacture of cellulosic moulded bodies in which cellulose is dissolved in a mixture of a tertiary amine oxide and a non-solvent for cellulose, e.g. water. The solution is extruded via a moulding tool and the filaments received are led via an air gap to a precipitation bath whilst being drawn. The process is characterised in that the precipitation bath substantially comprises a non-aqueous solvent for the tertiary amine oxide, whereby the molecular weight of the non-aqueous solvent is larger than that of the tertiary amine oxide. In this manner, solvent-spun fibers with a lower fibrillation tendency can be obtained. Polyethylene glycols are preferably used.Type: GrantFiled: June 21, 1996Date of Patent: October 27, 1998Assignee: Lenzing AktiengesellschaftInventor: Hartmut Ruf
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Patent number: 5798125Abstract: Apparatus for the preparation of cellulose fibers from a solution of cellulose in a tertiary amine oxide includes a spinneret having a multiplicity of spinning holes arranged essentially in a ring-shape. An inlet for cooling gas is positioned in the center of the ring-shape arrangement of the spinning holes and immediately downstream of the spinning holes. The inlet comprises a tube having a baffle plate at one end.Type: GrantFiled: June 6, 1995Date of Patent: August 25, 1998Assignee: Lenzing AktiengesellschaftInventors: Stefan Zikeli, Ernst Rauch, Hermann Koberger, Friedrich Ecker, Hartmut Ruf, Raimund Jurkovic, Franz Schwenninger
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Patent number: 5698151Abstract: To prepare cellulose fibres, a solution of cellulose in a tertiary amine-oxide is shaped in hot condition to give filaments, the filaments are cooled and then introduced into a precipitation bath in order to precipitate the dissolved cellulose, whereby the shaped solution is exposed to an essentially laminar gas stream (FIG. 2a) for cooling before introduction into the precipitation bath.Type: GrantFiled: March 14, 1994Date of Patent: December 16, 1997Assignee: Lenzing AktiengesellschaftInventors: Stefan Zikeli, Friedrich Ecker, Franz Schwenninger, Raimund Jurkovic, Hartmut Ruf
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Patent number: 5601771Abstract: The invention is concerned with a process for the production of cellulose fibres, wherein a solution of cellulose in an aqueous tertiary amine-oxide is extruded into filaments through spinning holes of a spinneret and the extruded filaments are conducted across an air gap into a substantially aqueous precipitation bath, characterized in that the extruded filaments, while being conducted across the air gap, are contacted with an aliphatic alcohol which is present exclusively in gaseous state. The process according to the invention produces cellulose fibres having a very reduced tendency to fibrillation.Type: GrantFiled: June 5, 1995Date of Patent: February 11, 1997Assignee: Lenzing AktiengesellschaftInventor: Hartmut Ruf
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Patent number: 5589125Abstract: To prepare cellulose mouldings, a solution of cellulose in a tertiary amine-oxide is moulded in a hot state and the moulded solution is introduced into a precipitation bath in order to precipitate the contained cellulose, wherein the hot moulded solution is cooled before introduction into the precipitation bath. Cooling occurs immediately after the moulding process and preferably consists of blowing air horizontally on to the cellulose moulding. The process according to the invention allows spinning of the cellulose solution with a high fibre density without the spun fibres sticking together after emerging from the spinneret. In spite of the high fibre density, it furthermore allows the use of a long air gap between the spinneret and the precipitation bath, by which means sufficient time is generated in the spinning process to affect the textile properties of the fibres by drawing at the die.Type: GrantFiled: November 16, 1993Date of Patent: December 31, 1996Assignee: Lenzing AktiengesellschaftInventors: Stefan Zikeli, Ernst Rauch, Hermann Koberger, Friedrich Ecker, Hartmut Ruf, Raimund Jurkovic, Franz Schwenninger
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Patent number: 5543101Abstract: Disclosed is a process for producing cellulose fibers having a decreased tendency to fibrillate. The process comprises the steps of extruding a solution of cellulose in a tertiary amine-oxide through spinning holes of a spinneret to form cellulose filaments, conducting the extruded cellulose filaments across an air gap of greater than 30 mm, and introducing the cellulose filaments into a precipitation bath. The process is carried out in a way that the mathematical expression 51.4+0.033.times.D+1937.times.M.sup.2 -7.18.times.T-0.094.times.L-2.50.times.F+0.045.times.F.sup.2, does not exceed the number 10. In the mathematical expression, D is the spinning hole diameter in .mu.m, M is the dope output per hole in g/min, T is the titer of the individual filament in dtex, L is the length of the air gap in mm and F is the humidity of the air in the air gap in g of water/kg of air.Type: GrantFiled: January 4, 1995Date of Patent: August 6, 1996Assignee: Lenzing AktiengesellschaftInventors: Hartmut Ruf, Markus Eibl, Raimund Jurkovic