Patents by Inventor Helmut Scharf

Helmut Scharf 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: 5009878
    Abstract: 1. Unstablized or stablized zirconium dioxide powder and processes for its preparation.2.1 The use of aqueous solutions and the isolation of precipitates are substantial disadvantages of conventional processes for the preparation of zirconium dioxide powders. Furthermore, the products often do not have the desired flow properties, compression properties and sinter properties owing to the lack of microcrystallinity.2.2 By melting zirconyl chloride optionally with a stabilizer or with a precursor of a stabilizer in the presence of a diol of the general formula HO--X--OH, in which X represents a saturated hydrocarbon radical having 2 to 5 carbon atoms, evaporating off water and hydrogen chloride, calcining the reaction product at elevated temperature in an oxygen-containing gas and optionally milling the calcined residue, an unstabilized or stabilized zirconium dioxide powder having good properties can be prepared without the use of disadvantageous process measures.2.
    Type: Grant
    Filed: May 31, 1990
    Date of Patent: April 23, 1991
    Assignee: Huels Aktiengesellschaft
    Inventor: Helmut Scharf
  • Patent number: 4867763
    Abstract: Solids are fractionally desublimed in vapor form from a gas/vapor mixture by providing a nozzle through which a gas/vapor mixture containing a solid is accelerated, the nozzle being provided with a concentric opening which allows a cooling gas flowing laterally at a high velocity to impinge upon and mix with the gas/vapor mixture flowing through the nozzle in the mixing zone of the nozzle thereby forming a gas/solid mixture, passing the gas/vapor mixture through the nozzle and the cooling gas through the concentric opening such that the angle at which the cooling gas emerges from the concentric opening into the flow of the gas/vapor mixture to the direction of flow of the gas/vapor mixture ranges from 0.17 pi rad to 0.
    Type: Grant
    Filed: August 4, 1988
    Date of Patent: September 19, 1989
    Assignee: Huels Aktiengesellschaft
    Inventor: Helmut Scharf
  • Patent number: 4773923
    Abstract: For the non-clogging, fractional desublimation of vapor-phase solids contained in a gas-vapor mixture, the gas-vapor mixture, exiting at high velocity from a nozzle, is mixed with a cooling gas, likewise exiting at high velocity from another nozzle. The gas-vapor mixture and the cooling gas flow toward each other, the axes of the two gaseous streams being a straight line. Fractional desublimation of the solids is attained by adjustment of flows leading to the regulation of the temperature and residence time of the cooled gas-vapor mixture. This desublimation system is capable of degrees of efficiency and solids purities higher than 99%.
    Type: Grant
    Filed: February 9, 1987
    Date of Patent: September 27, 1988
    Assignee: Huels Aktiengesellschaft
    Inventor: Helmut Scharf
  • Patent number: 4681046
    Abstract: A method for utilizing distillation residues of phthalic anhydride or maleic anhydride, which comprises: (a) cooling hot, liquid distillation residues of said phthalic anhydride or maleic anhydride while flowing as a stream in a first organic liquid; (b) comminuting said distillation residues solidifying in said first organic liquid by means of a cutting edge rotating at high rpm to produce a granulate; (c) suspending said granulate in a second organic liquid; and (d) incinerating the suspension or converting the suspension into synthesis gas.
    Type: Grant
    Filed: June 12, 1986
    Date of Patent: July 21, 1987
    Assignee: Huls Aktiengesellschaft
    Inventors: Helmut Scharf, Wilfried Krix
  • Patent number: 4598157
    Abstract: A method of separating pyromellitic acid dianhydride from the reaction gas obtained from the gas phase oxidation of 1,2,4,5-tetraalkylbenzene with an oxygen bearing gas in a closed gas circulatory system, comprising, (a) desublimating pyromellitic acid dianhydride by contacting the product gas obtained from said gas phase oxidation reaction with a cold, oxygen bearing gas, (b) catalytically burning the byproducts in the waste gas obtained from the desublimation step, and (c) recirculating a proportionate amount of the byproduct free waste gas to the oxidation reactor for the gas phase oxidation reaction.
    Type: Grant
    Filed: March 28, 1985
    Date of Patent: July 1, 1986
    Assignee: Chemische Werke Huls Aktiengesellschaft
    Inventor: Helmut Scharf
  • Patent number: 4250119
    Abstract: Isobutyraldehyde is produced by the oxo process and converted to acetone in the gas phase by oxidative decarbonylation on a zinc oxide supported copper oxide catalyst. The conversion is improved by adding about 2.5 to 25 percent by weight graphite to the catalyst, based on the total weight of catalyst.
    Type: Grant
    Filed: August 7, 1978
    Date of Patent: February 10, 1981
    Assignee: Chemische Werke Huls Aktiengesellschaft
    Inventors: Helmut Scharf, Gerhard Franz, HoGunther
  • Patent number: 4200589
    Abstract: This is an improvement in the process for preparing acetone by the catalytic, oxidative decarbonylation of isobutyraldehyde in the gaseous phase by passing a mixture consisting of isobutyraldehyde, oxygen and an inert diluent, when desired, at higher temperatures and at contact-times from 0.1 to 10 seconds over a carrier catalyst where the novel catalyst contains a mixture of copper oxide or manganese oxide, or a mixture thereof, with zinc oxide.A mixture comprising about 1 to 4.5 vol. % of isobutyraldehyde, about 1.2 to 99 vol. % of oxygen and an inert diluent, when desired, is passed over a catalyst at a temperature of about 130.degree. to 180.degree. C., consisting of about 0.1 to 6% by weight of Cu or Mn, or a mixture thereof, in the form of their oxides and of about 1 to 10% by weight of Zn in the form of zinc oxide on aluminum oxide as the carrier.
    Type: Grant
    Filed: December 27, 1978
    Date of Patent: April 29, 1980
    Assignee: Chemische Werke Huls A.G.
    Inventor: Helmut Scharf
  • Patent number: 4085240
    Abstract: A process for improving the adhesion of isocyanate-crosslinked polyester coatings on vulcanized articles of ethylene-.alpha.-olefin-diene terpolymers, characterized in that the vulcanized articles, which contain at least 30 parts by weight of carbon black per 100 parts by weight of the ethylene-.alpha.-olefin-diene terpolymer, are treated with a compound having a functional group reactive with isocyanates and a carbon structure with at least 4 carbon atoms.
    Type: Grant
    Filed: August 24, 1976
    Date of Patent: April 18, 1978
    Assignee: Chemische Werke Huels, A.G.
    Inventor: Helmut Scharf