Patents by Inventor Blagoje Levkov

Blagoje Levkov 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: 4828806
    Abstract: In a process for cleaning a waste gas containing various pollutants, the exhaust gas with the pollutants is introduced directly into a reduction reactor. In the reactor, the pollutants are reduced by ammonia. The catalyst used is iron oxide material or a mixed oxide material of iron oxide and chromium oxide, or a mixture of the mixture material of the mixed oxide material and the iron oxide material.
    Type: Grant
    Filed: November 30, 1987
    Date of Patent: May 9, 1989
    Assignees: Didier Werke AG, Didier Engineering GmbH
    Inventors: Claus Flockenhaus, Karl H. Laue, Theo Sander, Erich Hackler, Blagoje Levkov, Daniel Grimm, Hartmut Kainer, Hermann Stein
  • Patent number: 4760047
    Abstract: A quadrangular catalyst block having a plurality of through-going slots separated by intermediate walls, each of the slots having first and second characterizing dimensions, with one of the characterizing dimensions being significantly greater than the other.
    Type: Grant
    Filed: April 9, 1987
    Date of Patent: July 26, 1988
    Assignee: Didier-Werke AG
    Inventors: Peter Jeschke, Hartmut Kainer, Blagoje Levkov
  • Patent number: 4758545
    Abstract: A process for the manufacture of catalyst moldings from granular catalyst material, preferably iron ore, chromium ore or a similar ore, with the use of a binder is disclosed. The granular catalyst material is thermally pre-treated in a temperature range of approximately 250.degree. to 1000.degree. C., before it is mixed with dilute and/or concentrated sulfuric acid functioning as the binder.
    Type: Grant
    Filed: December 5, 1986
    Date of Patent: July 19, 1988
    Assignee: Didier-Werke AG
    Inventors: Daniel Grimm, Hartmut Kainer, Blagoje Levkov
  • Patent number: 4751212
    Abstract: The invention relates to a process for the manufacture of a catalyst for the reduction of nitrogen oxides in exhaust gases. The catalyst contains a metal oxide. The catalyst is preferably used for catalytic reduction with ammonia. The process comprises screening a natural goethite iron ore to the required grain size and then treating the ore with sulfuric acid. Subsequently, the goethite iron ore is heated to a temperature which approximately equals the temperature at which it will be used in the catalytic reaction.
    Type: Grant
    Filed: December 5, 1986
    Date of Patent: June 14, 1988
    Assignees: Didier Engineering GmbH, Didier-Werke AG
    Inventors: Claus Flockenhaus, Erich Hackler, Karl H. Laue, Klaus Merkel, Arnold Max, Werner Stender, Johann Jansen, Hartmut Kainer, Daniel Grimm, Blagoje Levkov
  • Patent number: 4746483
    Abstract: In a process for the manufacture of catalyst moldings a natural raw material containing Fe.sub.2 O.sub.3, Cr.sub.2 O.sub.3 or another such catalyst component such as TiO.sub.2, NbO.sub.2, WO.sub.3, V.sub.2 O.sub.5 or MoO.sub.3 is screened to a grain size equal to or less than approximately 0.25 mm. This screened base mixture is thoroughly blended, and then preferably a concentrated sulphuric acid is added. This mixture of material is then pressed into a molding in a hydraulic press with a pressure of approximately 500 bar to produce the molding.
    Type: Grant
    Filed: September 9, 1986
    Date of Patent: May 24, 1988
    Assignees: Didier Engineering GmbH, Didier Werke AG
    Inventors: Claus Flockenhaus, Karl-Heinz Laue, Klaus Merkel, Erich Hackler, Johann Jansen, Arnold Max, Werner Stender, Reinhard Kruse, Hartmut Kainer, Daniel Grimm, Blagoje Levkov
  • Patent number: 4721699
    Abstract: A structure made from catalyst for use in the separation of nitrogen oxides from combustion exhaust gases which contain dust. The catalytic structure has plates with spaces therebetween to carry a flow of the exhaust gas therethrough. The catalyst is constructed of individual ceramic plates. The abrasion or wear resistance of the plates is chosen such that the dust in the exhaust gases flowing through the spaces abrades the plate surface at a rate which is at least equivalent to the deactivation of the catalyst surface by action of the nitrogen oxides, which constantly provides a fresh catalyst surface for reaction with the nitrogen oxides. The movement of the exhaust gas through the catalytic structure carries the dust and abraded material along with it and out of the structure.
    Type: Grant
    Filed: August 27, 1986
    Date of Patent: January 26, 1988
    Assignees: Didier-Werke AG, Didier Engineering GmbH
    Inventors: Dietrich Wagener, Karl H. Laue, Egmar Wunderlich, Theo Sander, Claus Flockenhaus, Erich Hackler, Blagoje Levkov, Daniel Grimm, Hartmut Kainer, Hermann Stein
  • Patent number: 4720376
    Abstract: A process for the removal of nitrogen oxides and soot from exhaust gases from machines and combustion installations burning heavy fuel oil by means of free-passage catalysts at increased temperatures with the addition of ammonia into the exhaust gas stream ahead of the catalysts. To make the process mre effective, the soot adhering to the catalyst surfaces is removed by burning it off and/or by friction resulting from the admixture of sand, ash or similar abrasive mixtures into the exhaust gas stream ahead of the catalysts.
    Type: Grant
    Filed: May 6, 1986
    Date of Patent: January 19, 1988
    Assignees: Didier Engineering GmbH, Didier-Werke AG
    Inventors: Karl H. Laue, Claus Flockenhaus, Erich Hackler, Blagoje Levkov, Daniel Grimm, Hartmut Kainer, Hermann Stein, Hans-Eugen Buhler
  • Patent number: 4672052
    Abstract: A catalyst for use in a process for the removal of nitrogen oxides from exhaust gases contaminated with dust in which the process uses ammonia. The catalyst is made of a material which is easily disposable. Furthermore, the catalyst should be completely used up in the catalysis. The catalyst comprises individual ceramic bricks with a porous surface, and passages therethrough for the flow of the exhaust gases. The bricks exhibit a resistance to abrasion which is designed so that the dust of the exhaust gas which flows through the passages erodes the catalyst surface, thereby reactivating the catalyst. The exhaust gas carries the dust and the eroded material along with it.
    Type: Grant
    Filed: August 22, 1985
    Date of Patent: June 9, 1987
    Assignees: Didier-Werke AG, Didier Engineering GmbH
    Inventors: Dietrich Wagener, Karl H. Laue, Egmar Wunderlich, Theo Sander, Claus Flockenhaus, Erich Hackler, Blagoje Levkov, Daniel Grimm, Hartmut Kainer, Hermann Stein
  • Patent number: 4656148
    Abstract: In a process for the reactivation of a catalyst, which is used for the removal of NO.sub.x, oxides of nitrogen, from exhaust gases, the catalyst should be capable of easy reactivation. For this purpose, when the catalyst starts to lose its activity, it is exposed in a reducing atmosphere to a carbon monoxide current. In an apparatus for the execution of the process, the catalyst is placed in two separate chambers. The carbon monoxide stream is directed alternately to both chambers.
    Type: Grant
    Filed: August 22, 1985
    Date of Patent: April 7, 1987
    Assignee: Didier-Werke AG
    Inventors: Hans-Eugen Buhler, Hermann Stein, Blagoje Levkov, Hartmut Kainer, Horst Kalfa, Daniel Grimm