Patents by Inventor Josef Riedl

Josef Riedl 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: 4543298
    Abstract: The present invention relates to the improvement of metal cords for the reinforcement of elastomeric bodies, in particular of vehicle tires which are provided with retaining helixes on their outsides. The problem was to avoid the disadvantageous properties of the retaining helixes in reinforced elastomeric bodies, namely, the impairment of the inherent elasticity of the metal cord and the fretting of the retaining helixes on the outer layer of the metal cord. The problem particularly resided in the improvement of socalled compact cords, meaning cords consisting of layers of identical twisting sense. For the solution of this problem, it is proposed to provide a core strand of shorter twisting pitch (twisting pitch ratio of preferably 1:2 or less) than the twisting pitch of the adjacent outer layer; this in particular in the case of metals cords having more than two layers.
    Type: Grant
    Filed: August 21, 1984
    Date of Patent: September 24, 1985
    Assignee: Stahlcord Betriebsgesellschaft m.b.H.
    Inventor: Josef Riedl
  • Patent number: 4335014
    Abstract: Supported silver catalysts, which should have as high an activity as possible, are employed for the manufacture of ethylene oxide by oxidizing ethylene by means of oxygen or air. A process is described for improving the activity of supported silver catalysts which have already been used, in which the used catalyst is first washed with an inert liquid containing ammonia and/or aliphatic amines and 1 to 1,000 parts, per 1 million parts of catalyst, of cesium, rubidium or a mixture thereof is then deposited on the washed catalyst. The deposition is generally effected with the aid of an impregnating solution containing the cesium and/or rubidium compounds in a suitable quantity. This process makes it possible to improve considerably the activity of supported silver catalysts which have already been in use for the oxidation of ethylene by means of oxygen or air.
    Type: Grant
    Filed: September 17, 1980
    Date of Patent: June 15, 1982
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Josef Alfranseder, Sigmund Mayer, Siegfried Rebsdat, Josef Riedl, Iwo Schaffelhofer
  • Patent number: 4329527
    Abstract: A process for the manufacture of 1,2-dichloroethane is described, in which 1 mol of ethylene, 0.35 to 0.7 mol of chlorine, 0.7 to 1.4 mol of hydrogen chloride and 0.2 to 0.6 mol of oxygen, optionally together with inert gas, are reacted in a reaction zone containing surfaces capable of being heated and cooled, at 180.degree. to 260.degree. C. and under a pressure of 0.09 to 1.1 MPa, in the presence of a fixed bed catalyst containing copper. The process allows better utilization of the heat generated in the chlorination of ethylene.
    Type: Grant
    Filed: December 3, 1980
    Date of Patent: May 11, 1982
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Wenzel Kuhn, Josef Riedl, Peter Widmann
  • Patent number: 4324932
    Abstract: The description covers a process for the manufacture of vinyl chloride by thermal cracking of 1,2-dichloroethane. The hot gas leaving the reaction furnace is cooled to the inlet temperature of the column in which the hydrogen chloride is separated from the products of thermal cracking of the 1,2-dichloroethane. Within the range of 560.degree. to 480.degree. C. and of 220.degree. to 120.degree. C., one or more cooling stages are applied through which the reaction gas mixture passes at high flow velocity, the cooling device being preferably a single-tube cooler. Starting from about 220.degree. C., a liquid substantially consisting of 1,2-dichloroethane may be added intermittently. The heat transferred to the coolant in the stages of indirect cooling is preferably reused within the vinyl chloride manufacturing process.
    Type: Grant
    Filed: July 17, 1980
    Date of Patent: April 13, 1982
    Inventors: Gerhard Link, Josef Riedl, Walter Frohlich, Reinhard Krumbock
  • Patent number: 4225520
    Abstract: Vinyl chloride is produced by pyrolytic decomposition of 1,2-dichloroethane in a furnace with coiled up reaction tube having an internal diameter of from 12 to 16 cm. The dichloroethane is vaporized completely in the convection zone of the pyrolytic furnace, different amounts of heat are supplied to the different zones of the reaction tube and, after decomposition in the working up of the reaction products, the low-boiling constitutents are treated with chlorine and separated together with the high-boiling constituents.
    Type: Grant
    Filed: October 1, 1976
    Date of Patent: September 30, 1980
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Josef Riedl, Walter Frohlich, Erich Mittermaier
  • Patent number: 4186106
    Abstract: The activity of supported silver catalysts, which have been used for the direct oxidation of ethylene to ethylene oxide with molecular oxygen or air and to which from 1 to 1,000 parts, per 1 million parts of catalyst, of cesium and/or rubidium have been applied, is improved by washing the catalyst with an inert liquid prior to the application of cesium and/or rubidium.
    Type: Grant
    Filed: September 5, 1978
    Date of Patent: January 29, 1980
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Siegfried Rebsdat, Sigmund Mayer, Josef Alfranseder, Josef Riedl
  • Patent number: 4177169
    Abstract: The activity of supported silver catalysts for the direct oxidation of ethylene to ethylene oxide with molecular oxygen or air is improved by applying to the catalyst from 1 to 1,000 ppm, preferably 20 to 500 ppm, of cesium and/or rubidium in two or more than two steps and using the catalyst after each impregnation step again for the production of ethylene oxide by direct oxidation of ethylene with molecular oxygen or air.
    Type: Grant
    Filed: October 26, 1977
    Date of Patent: December 4, 1979
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Siegfried Rebsdat, Sigmund Mayer, Josef Alfranseder, Josef Riedl
  • Patent number: 4123385
    Abstract: The activity of supported silver catalysts used up in the direct oxidation of ethylene with molecular oxygen or air is improved by impregnating the catalyst arranged in a fixed bed with a solution of a caesium and/or rubidium compound in an inert organic solvent, optionally together with up to 40% by weight of water, calculated on the total liquid, as dissolving intermediary, so as to produce a concentration gradient of from 0.3 to 20 parts of caesium and/or rubidium per 1 million parts of catalyst and per meter of fixed bed, counter to the direction of flow of the gas to be reacted. In this manner the activity of the catalyst is considerably improved which results in an increased selectivity of the oxidation of ethylene to ethylene oxide.
    Type: Grant
    Filed: August 9, 1977
    Date of Patent: October 31, 1978
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Siegfried Rebsdat, Sigmund Mayer, Josef Alfranseder, Josef Riedl