Patents Assigned to Didier-Werke AG
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Patent number: 5788159Abstract: A circular, surface-coating application of sprayable composition or mortar is achieved through a rotatable spray head with at least one lateral discharge opening. The composition or mortar is distributed as uniformly and over as large a surface area as possible in the vicinity of the spray head. The spray head is moved axially forwards and back in an axial direction through the same distance during conveying of the composition or mortar and is rotated automatically through the same angular distance about the axis.Type: GrantFiled: July 25, 1996Date of Patent: August 4, 1998Assignee: Didier-Werke AGInventor: Stefan Pischek
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Patent number: 5690854Abstract: A regulation and closure apparatus for a metallurgical vessel includes a stator to be disposed in a vessel wall and a rotor is rotatably supported in the stator for choking or blocking melt flow. A heating capability is provided in that the rotor is encompassed by an inductor to whose field melt in a through-passage channel in the rotor or the rotor can be coupled electromagnetically.Type: GrantFiled: November 19, 1996Date of Patent: November 25, 1997Assignee: Didier-Werke AGInventors: Raimund Bruckner, Rick Ardell, Bernhard Schiefer
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Patent number: 5686008Abstract: A closure and/or regulation apparatus for controlling the outflow of melt from a metallurgical vessel includes a stator and a rotor rotatable relative to the stator. Additional responsive control of outflow is provided by a chamber that is part of or is connected to an outflow channel that can be connected to a vacuum generator.Type: GrantFiled: September 24, 1996Date of Patent: November 11, 1997Assignee: Didier-Werke AGInventors: Raimund Bruckner, Jose Gimpera, Steve Lee
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Patent number: 5657997Abstract: A fixing device for a ceramic sealing plate in a carrying frame or cassette of a seal on a metallurgical vessel has the sealing plate held by a band on the carrying frame or the cassette. To press the sealing plate evenly along its perimeter, the band is corrugated in its longitudinal direction. One set of ridges of the band lies elastically on the sealing plate. The ridges lying between the one set lie elastically on the carrying frame or on the cassette, or on a spacer sheet between the band and the carrying frame of the cassette.Type: GrantFiled: May 3, 1995Date of Patent: August 19, 1997Assignee: Didier-Werke AGInventor: Ernst Luhrsen
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Patent number: 5656192Abstract: An immersed metallurgical pouring nozzle, such as a submerged entry nozzle for pouring molten steel, comprises a body of refractory material, such as graphite alumina, which defines a flow passage. An annular member of refractory material, such as zirconia with a very low or no-content of carbon, whose erosion resistance is higher than that of the body of the nozzle is wholly encapsulated in the material of the body of the nozzle.Type: GrantFiled: April 3, 1996Date of Patent: August 12, 1997Assignee: Didier-Werke AGInventor: Steven John Lee
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Patent number: 5603887Abstract: The invention relates to a process of making fiber structures in the form of refractory light-weight moldings. These fiber structures exhibit the advantage that they do not contain, or contain virtually no harmful fibers, and/or that such fibers that might still exist in the fiber structures can be readily decomposed by water or body fluids. Nevertheless, the fiber structures exhibit the advantageous thermal and mechanical properties of conventional light-weight moldings. The fiber structures according to the invention are manufactured using inorganic fibers, wherein at least 90% by weight of each fiber comprises 20-50% by weight of CaO and 50-80% by weight of Al.sub.2 O.sub.3. The rest comprises a maximum of 10% by weight of typical impurity oxides. Water or a water-containing liquid is used as the charge liquid, and conventional refractory additives may also be added to the mixture of fibers and water to be molded.Type: GrantFiled: December 6, 1995Date of Patent: February 18, 1997Assignee: Didier-Werke AGInventor: Axel Eschner
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Patent number: 5552213Abstract: The invention relates to fiber structures in the form of refractory light-weight moldings. These fiber structures exhibit the advantage that they do not contain, or contain virtually no harmful fibers, and/or that such fibers that might still exist in the fiber structures can be readily decomposed by water or body fluids. Nevertheless, the fiber structures exhibit the advantageous thermal and mechanical properties of conventional light-weight moldings. The fiber structures according to the invention are manufactured using inorganic fibers, wherein at least 90% by weight of each fiber comprises 20-50% by weight of CaO and 50-80% by weight of Al.sub.2 O.sub.3. The rest comprises a maximum of 10% by weight of typical impurity oxides. Water or a water-containing liquid is used as the charge liquid, and conventional refractory additives may also be added to the mixture of fibers and water to be molded.Type: GrantFiled: December 30, 1994Date of Patent: September 3, 1996Assignee: Didier-Werke AGInventor: Axel Eschner
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Patent number: 5547170Abstract: A blasting device to be used to introduce a gas and/or a solid material into a metallurgical vessel such as a convertor includes a plurality of blasting tubes arranged in a tube bundle, with ends of the tubes being inserted into respective receiving bores formed in a metal apertured plate, with a press fit therebetween. A space defined within the tube bundle is filled with a prefabricated ceramic internal member. The tube bundle with the internal member therein are positioned within a pressing mold that is partially filled with a portion of ceramic material to be used to form a blasting brick. The remainder of the ceramic material to form the blasting brick then is filled into the interior of the pressing mold. The mold then is operated to press the ceramic material to form a blasting brick with the tube bundle and internal member situated therein.Type: GrantFiled: September 14, 1995Date of Patent: August 20, 1996Assignee: Didier-Werke AGInventors: Alois Angeler, Harald Kaune, Theo Scheuten
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Patent number: 5547014Abstract: An immersion nozzle includes an immersion zone inserted into a long-thin mold cavity of a mold. A discharge channel extends through the nozzle for discharging molten metal into the mold cavity. The discharge channel includes an inlet region, an outlet region including a portion passing through the immersion zone, and a pool-forming chamber between the inlet region and the outlet region at a location adjacent the immersion zone. The portion of the outlet region of the discharge channel that extends through the immersion zone is widened and has a configuration to approximate the cross-sectional configuration of the mold cavity. The outlet region has, extending from the chamber in a direction of material flow, a configure approximately corresponding to the configuration of the portion of the outlet region through the immersion zone.Type: GrantFiled: May 31, 1994Date of Patent: August 20, 1996Assignee: Didier-Werke AGInventors: Raimund Bruckner, Jose Gimpera
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Patent number: 5542466Abstract: A method of casting molten material into a strip-shaped product having substantially intended final dimensions that first supplies molten material into the interior of a vessel having a casting nozzle connected thereto. The nozzle is formed of a refractory ceramic material and has a passage extending therethrough from an inlet opening connected directly to the interior of the vessel to an outlet opening. The nozzle is oriented relative to the vessel so that the outlet opening is positioned at a location higher than the inlet opening. Molten material passes from the vessel interior directly through the inlet opening and into the passage until an upper level of molten material in the passage is the same as an upper level of molten material in the vessel interior and below the outlet opening. Solidification of the molten material is commenced in the passage, thereby forming solidifying material.Type: GrantFiled: March 28, 1995Date of Patent: August 6, 1996Assignee: Didier-Werke AGInventors: Raimund Bruckner, Rudiger Grau
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Patent number: 5533713Abstract: A blasting device to be used to introduce a gas and/or a solid material into a metallurgical vessel such as a convertor includes a plurality of blasting tubes arranged in a tube bundle, with ends of the tubes being inserted into respective receiving bores formed in a metal apertured plate, with a press fit therebetween. A space defined within the tube bundle is filled with a prefabricated ceramic internal member. The tube bundle with the internal member therein are positioned within a pressing mold that is partially filled with a portion of ceramic material to be used to form a blasting brick. The remainder of the ceramic material to form the blasting brick then is filled into the interior of the pressing mold. The mold then is operated to press the ceramic material to form a blasting brick with the tube bundle and internal member situated therein.Type: GrantFiled: February 14, 1995Date of Patent: July 9, 1996Assignee: Didier-Werke AGInventors: Alois Angeler, Harald Kaune, Theo Scheuten
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Patent number: 5494266Abstract: A vessel, for example a metallurgical tundish for multi-strand casting, has at least one discharge assembly/block. Such assembly includes a refractory perforated brick fitted in the vessel, the perforated brick having therethrough an opening that is at least partially defined by a surface that is rotationally symmetrical about a longitudinal center axis of the opening. A refractory nozzle brick has a peripheral surface that is rotationally symmetrical about a longitudinal center axis of the nozzle brick. The nozzle brick has therethrough a discharge opening that is located eccentrically of the longitudinal center axis of the nozzle brick. The nozzle brick fits into the opening in the perforated brick with the longitudinal center axes thereof coincident, such that the nozzle brick is rotatable relative to the perforated brick about a rotation axis that is defined by the coincident longitudinal center axes.Type: GrantFiled: October 31, 1994Date of Patent: February 27, 1996Assignee: Didier-Werke AGInventors: Kurt Engelmann, Laurenz Keisers
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Patent number: 5429283Abstract: An immersion nozzle is employed for discharging material from a vessel to a mold and includes an upper section to be connected to the vessel and a lower section having a region to be immersed in material in the mold. The upper and lower sections have extending therethrough respective discharge channels that communicate and that enable material to be discharged from the vessel to the mold. The discharge channel of the upper section converges downwardly in a first vertical plane to join the discharge channel of the lower section. The discharge channel of the upper section also expands downwardly in a second vertical plane transverse to the first vertical plane to join the discharge channel of the lower section. Each of the upper and lower sections is formed by at least one respective separate member. The members have adjacent ends having mutually facing and fitting surfaces, and each pair of facing and fitting end surfaces has therebetween a seal.Type: GrantFiled: May 31, 1994Date of Patent: July 4, 1995Assignee: Didier-Werke AGInventors: Ernst Luhrsen, Siegfried Pohl, Karl Baum, Erich Galle
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Patent number: 5420087Abstract: Refractory or fireproof brick useful as tin bath bottom brick, wherein the brick is made of a calcium aluminate having both coarse and fine grain sizes, and a binder made of calcium aluminate.Type: GrantFiled: February 15, 1994Date of Patent: May 30, 1995Assignee: Didier-Werke AGInventors: Klaus Wieland, Thomas Weichert, Axel Eschner, Christoph Wohrmeyer
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Patent number: 5413744Abstract: A process for heating a ceramic shaped part by providing a ceramic shaped part which at ambient temperature has a homogeneously distributed carbon skeleton, and heating the shaped part inductively.Type: GrantFiled: October 13, 1993Date of Patent: May 9, 1995Assignee: Didier-Werke AGInventors: Raimund Bruckner, Ullrich Hintzen, Ernst Luhrsen, Hans Rothfuss, Albert Ott
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Patent number: 5346868Abstract: The invention relates to inorganic fibers, and a process for their production. The inorganic fibers lose their fiber form factor after a short contact period with water or a physiological body fluid, so that danger to health is not expected from such fibers remaining for a prolonged period of time in or on human tissue. The fiber of the invention is characterized by the fact that at least 90% of it comprises 20-50% by weight of CaO and 50-80% by weight of Al.sub.2 O.sub.3. The rest comprises a maximum of 10% by weight of typical impurity oxides.Type: GrantFiled: June 8, 1993Date of Patent: September 13, 1994Assignee: Didier-Werke AGInventor: Axel Eschner
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Patent number: 5310164Abstract: A tapping pipe is provided for a melt vessel having a predetermined melt maximum bath level X.sub.m. The tapping pipe defines a flow passage therethrough which has a discharge zone having flow cross-sections approximately the same as the cross-sections of the flow profile of a free flowing stream of the melt from a melt bath level X.sub.0 between 30% and 70% of the maximum melt bath level X.sub.m. The discharge zone can be provided by a brick defining the discharge zone, together with additional bricks defining a feed zone and a transition zone between the feed zone and the discharge zone. In making a number of replacements of the tapping pipe in a converter, the length of the brick defining the transition zone can be gradually reduced so as to compensate for the wear of the converter lining.Type: GrantFiled: March 17, 1993Date of Patent: May 10, 1994Assignee: Didier-Werke AGInventors: Hans Rothfuss, Gunther Haubold, Dieter Bach, Werner Glasmacher, Dieter Stusser
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Patent number: 5303905Abstract: A refractory ceramic stopper has therein a recess including an annular outwardly enlarged portion defining a stop surface. A stopper rod inserted into the recess in the stopper has a support surface. A plurality of spreadable members having opposite ends are positioned about the stopper rod and are inserted therewith into the recess in the stopper. The spreadable members are spread outwardly such that they enter the enlarged portion of the recess in the stopper with first ends of the spreadable members confronting the stop surface of the stopper and with second ends of the spreadable members confronting the support surface of the stopper rod. Thereby the spreadable members lock the stopper onto the stopper rod.Type: GrantFiled: September 23, 1992Date of Patent: April 19, 1994Assignee: Didier-Werke AGInventors: Siegfried Pohl, Dirk Masurat, Ernst Luhrsen, Gerd Bohndorf
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Patent number: 5279993Abstract: A gas injection stone is manufactured by embedding in a refractory compound a plurality of adjacent and abutting nets. Thereby, when the refractory compound is solidified and when the nets subsequently are removed by burning or melting, the result will be the formation within the stone of plural interconnected layers of interlinked gas channels.Type: GrantFiled: December 9, 1991Date of Patent: January 18, 1994Assignee: Didier-Werke AGInventors: Hans Rothfuss, Herbert Metzger, Manfred Winkelmann, Jochen Kopia
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Patent number: 5249811Abstract: An annular space is formed between the opening of a refractory lining in a metallurgical vessel and a shaped element to be joined to the refractory lining in the opening. A joint packing is provided to be packed in the annular space. The joint packing is an annular, deformable, prefabricated packing adapted to the volume or the shape of the annular space. The joint packing is fixable in position in either the opening of the refractory lining or on the shaped piece when the joint arrangement is assembled. Preferably, the joint packing comprises a packing compound provided in a sleeve.Type: GrantFiled: August 13, 1991Date of Patent: October 5, 1993Assignee: Didier-Werke AGInventors: Raimund Bruckner, Hans Rothfuss, Manfred Berndt