Patents by Inventor Franz Schwenninger
Franz Schwenninger 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: 5988437Abstract: A device is disclosed to draw off or store viscous mass which is discharged from a process for example as a result of exothermal events. The device contains at least one unit which has one inlet for the viscous mass and one outlet and is at least partly filled with a non combustible liquid inert to the viscous mass. The unit can be in the form of a pipe or a receptacle. Preferably several units in the form of a pipe can be connected one with the other respectively with a unit in the form of a receptacle. The solution discharged can then be transported via the pipes to the receptacle.Type: GrantFiled: March 1, 1999Date of Patent: November 23, 1999Assignee: Lenzing AktiengesellschaftInventors: Wolfram Kalt, Friedrich Ecker, Wilhelm Feilmair, Franz Schwenninger, Michael Longin
-
Patent number: 5984655Abstract: Spinning apparatus for carrying out a dry/wet-spinning process includes a spinneret for extruding filaments, a blowing device whereby the extruded filaments may be cooled immediately after being delivered from the spinning holes, a container containing spinning bath liquid, and means for bundling the extruded filaments provided in the spinning bath liquid. Preferably, the same means serves both for bundling and diverting the extruded filaments and is non-rotatable.Type: GrantFiled: October 7, 1996Date of Patent: November 16, 1999Assignee: Lenzing AktiengesellschaftInventors: Franz Schwenninger, Friedrich Ecker, Wilhelm Feilmair, Christoph Schrempf, Heinrich Firgo, Stefan Zikeli, Ernest Rauch
-
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
-
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
-
Patent number: 5795488Abstract: The invention is concerned with a process for transporting a solution of cellulose in an aqueous tertiary amine-oxide through a component wherein said cellulose solution has different flow rates in said component, characterized in that an outlet wherethrough part of said cellulose solution is discharged from said component is provided at a point within said component whereat said flow rate is relatively low. (FIG.Type: GrantFiled: September 19, 1996Date of Patent: August 18, 1998Assignee: Lenzing AktiengesellschaftInventors: Wolfram Kalt, Johann Manner, Heinrich Firgo, Franz Schwenninger
-
Patent number: 5773655Abstract: The invention is concerned with a process for the purification of an aqueous solution of a tertiary amine-oxide containing impurities partially present in a dissolved and partially in a non-dissolved, colloidal state, and is characterized by a combination of the steps of(A) removing from the aqueous solution substantially all of said impurities present in a non-dissolved, colloidal state and(B) contacting said aqueous solution obtained in step (A) with an ion exchanger.Type: GrantFiled: April 15, 1997Date of Patent: June 30, 1998Assignee: Lenzing AktiengesellschaftInventors: Eduard Mulleder, Bruno Mangeng, Franz Schwenninger, Johann Manner
-
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
-
Patent number: 5628941Abstract: The invention is concerned with a process for the production of cellulose moulded bodies. In this process, cellulose is first dissolved in an aqueous solution of a tertiary amine-oxide, in particular N-methylmorpholine-N-oxide (NMMO), to produce a mouldable cellulose solution. Second, the cellulose solution is molded and conducted into an aqueous precipitation bath, wherein the cellulose is precipitated, which produces a moulded body and a spent precipitation bath. Next, the spent precipitation bath is regenerated. This regenerated aqueous amine-oxide solution is re-used to dissolve cellulose, thereby repeating the process. In the above process, the repeated aqueous amine-oxide solution has a pH within certain defined limits.Type: GrantFiled: June 5, 1995Date of Patent: May 13, 1997Assignee: Lenzing AktiengesellschaftInventors: Wolfram Kalt, Heinrich Firgo, Johann Manner, Eduard Mulleder, Bruno Mangeng, Arnold Nigsch, Franz Schwenninger, Christoph Schrempf
-
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
-
Patent number: 5582783Abstract: The invention is concerned with a process for controlling a flowing suspension of shredded cellulose in a liquid, aqueous tertiary amine-oxide and is characterized by the combination of measures that (A) the suspension is introduced into a vessel having an inlet for the suspension, (B) the suspension introduced into the vessel is transported through the vessel and (C) the suspension transported throught the vessel is discharged from the vessel by means of an outlet, (D) the weight of the vessel being measured and the introduction and discharging of the suspension being controlled by means of deviations from a predetermined set value.Type: GrantFiled: June 2, 1995Date of Patent: December 10, 1996Assignee: Lenzing AktiengesellschaftInventors: Stefan Zikeli, Ulrich Moderl, Friedrich Ecker, Franz Schwenninger