Patents by Inventor Horacio E. Bergna
Horacio E. Bergna 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).
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Patent number: 5569785Abstract: This invention provides an attrition resistant catalyst composition and method for producing such composition. The catalyst is comprised of an acidic zeolite, rho or chabazite, and a particulate binder, kaolin, bentonite, alpha-alumina, or titania, which can be optionally modified by treatment with a compound containing Si, Al, P or B.This invention further provides a process for producing methylamines, preferably dimethylamine, comprising reacting methanol and/or dimethyl ether and ammonia in the presence of a catalytic amount of an attrition resistant catalyst of the invention.Type: GrantFiled: May 30, 1995Date of Patent: October 29, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventors: Konstantinos Kourtakis, Horacio E. Bergna, George C. Sonnichsen, David R. Corbin, Loren D. Brake
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Patent number: 5082810Abstract: An improved ceramic dielectric composition comprising a chemically homogeneous distribution of a mixture of additives on the surface of particles of ceramic powder, and to a method for enhancing the dielectric properties and sinterability of such compositions at low firing temperatures.Type: GrantFiled: February 28, 1990Date of Patent: January 21, 1992Assignee: E. I. Du Pont de Nemours and CompanyInventors: Horacio E. Bergna, Salvatore A. Bruno, Ian Burn
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Patent number: 5011804Abstract: An improved ceramic dielectric composition for preparing multilayer ceramic structures for electronic devices and a method of enhancing the sinterability of such compositions at low firing temperatures by improving the distribution of zinc borate based sintering flux uniformly throughout the composition.Type: GrantFiled: February 28, 1990Date of Patent: April 30, 1991Assignee: E. I. Du Pont de Nemours and CompanyInventors: Horacio E. Bergna, Ian Burn
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Patent number: 4849539Abstract: This invention relates to highly attrition resistant catalysts, catalyst precursors and catalyst supports and to processes for making and using them.Type: GrantFiled: April 8, 1988Date of Patent: July 18, 1989Assignee: E. I. Du Pont de Nemours and CompanyInventor: Horacio E. Bergna
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Patent number: 4769477Abstract: This invention relates to highly attrition resistant catalysts, catalyst precursors and catalyst supports and to processes for making and using them.Type: GrantFiled: April 6, 1987Date of Patent: September 6, 1988Assignee: E. I. Du Pont de Nemours and CompanyInventor: Horacio E. Bergna
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Patent number: 4752596Abstract: A process for producing dimethylamine is provided, comprising reacting methanol and/or dimethylether and ammonia, in amounts sufficient to provide a carbon/nitrogen (C/N) ratio from about 0.2 to about 1.5, and at a temperature from about 250.degree. C. to about 450.degree. C., in the presence of a catalytic amount of a modified acidic zeolite selected from the group consisting of chabazite, erionite, ZK-5, and rho, the zeolite having been modified by treatment with one or more compounds containing at least one element selected from the group consisting of silicon, aluminum, phosphorus, and boron, to deposit thereon at least 0.05 weight percent of the element.Type: GrantFiled: March 31, 1987Date of Patent: June 21, 1988Assignee: E. I. Du Pont de Nemours and CompanyInventors: Horacio E. Bergna, David R. Corbin, George C. Sonnichsen
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Patent number: 4683334Abstract: A process for producing dimethylamine is provided, comprising reacting methanol and/or dimethylether and ammonia, in amounts sufficient to provide a carbon/nitrogen (C/N) ratio from about 0.2 to about 1.5, and at a temperature from about 250.degree. C. to about 450.degree. C., in the presence of a catalytic amount of a modified acidic zeolite selected from the group consisting of chabazite, erionite, ZK-5, and rho, the zeolite having been modified by treatment with one or more compounds containing at least one element selected from the group consisting of silicon, aluminum, phosphorus, and boron, to deposit thereon at least 0.05 weight percent of the element.Type: GrantFiled: April 30, 1985Date of Patent: July 28, 1987Assignee: E. I. Du Pont de Nemours & CompanyInventors: Horacio E. Bergna, David R. Corbin, George Sonnichsen
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Patent number: 4677084Abstract: This invention relates to highly attrition resistant catalysts, catalyst precursors and catalyst supports and to processes for making and using them.Type: GrantFiled: November 27, 1985Date of Patent: June 30, 1987Assignee: E. I. Du Pont de Nemours and CompanyInventor: Horacio E. Bergna
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Patent number: 4477492Abstract: There is disclosed a process for preparing superficially porous macroparticles comprising spray drying a specified well-mixed slurry of core macroparticles, colloidal inorganic microparticles and a liquid and sintering the resulting product to cause a 5%-30% decrease in surface area.Type: GrantFiled: April 22, 1983Date of Patent: October 16, 1984Assignee: E. I. Du Pont de Nemours and CompanyInventors: Horacio E. Bergna, Joseph J. Kirkland
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Patent number: 4410405Abstract: Concentrated aqueous silica sols of small silica particles about 10 nm or less in diameter and uniformly sized are prepared by a process for maintaining a constant number of silica nuclei particles prior to the deposition process. The process for maintaining a constant number of silica nuclei particles in the sol consists of forming the particles at a pH 8-10.5 and a low temperature then heating the sol through a transition temperature to a deposition temperature, maintaining the pH, removing alkali metal ions and simultaneously adding alkali metal silicate from the system at a rate such that the number of silica particles in the sol remains constant while the temperature is being raised.Type: GrantFiled: April 10, 1981Date of Patent: October 18, 1983Assignee: E. I. Du Pont de Nemours and Co.Inventor: Horacio E. Bergna
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Patent number: 4316744Abstract: Binder solution for preparing sand cores of initial high strength but with essentially no strength after casting metals above 700.degree. C., said binder solution comprising an aqueous solution of sodium, potassium or lithium silicate having an overall molar ratio of SiO.sub.2 /alkali metal oxide from 3.5:1 to 10:1, and containing sufficient amorphous silica so that the fraction of the total silica in the binder solution which is present as amorphous silica is from 2 to 75%, the amorphous silica having a particle size in the range from about 2 nanometers to 500 nanometers.Type: GrantFiled: October 16, 1980Date of Patent: February 23, 1982Assignee: E. I. Du Pont de Nemours and CompanyInventor: Horacio E. Bergna
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Patent number: 4272409Abstract: An amorphous aluminosilicate sol with uniform size particles and a porous amorphous aluminosilicate powder composition useful as a catalyst in petroleum cracking is prepared by a process comprising (1) preparing a sol of discrete colloidal particles of uniform size within the range of from 2 to 87 nanometers, the surface of the particles consisting of a coating of an aluminosilicate at least 0.5 nanometer in thickness, by separately and simultaneously adding a sol of silica or a solution of sodium or potassium silicate and a solution of sodium or potassium aluminate to a heel sol of uniform-sized colloidal particles of aluminosilicate, silica, or one or more refractory metal oxides at a certain rate of addition and at a constant pH in the range of 9 to 12 and a temperature of 50.degree. to 100.degree. C.Type: GrantFiled: October 12, 1979Date of Patent: June 9, 1981Assignee: E. I. Du Pont de Nemours and CompanyInventor: Horacio E. Bergna
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Patent number: 4257874Abstract: An amorphous aluminosilicate sol with uniform size particles and a porous amorphous aluminosilicate powder are useful as catalyst in petroleum cracking. Water is removed from the sol without gelling so that the particles become uniformly packed into aggregates having pores of substantially uniform size and coating said powder with a surface layer 0 to 15% by weight of a metal or metal oxide, said powder having a specific surface area of 30 to 750 m.sup.2 /g, a bulk density of 0.5 g/cc or more and substantially uniform size pore diameters of from 20 A to 250 A, with pore diameters of 20 A to 45 A having a uniformity such that at least 90% of the pore volume is made up of pores of from 0.6D to 1.4D and pore diameters of 45 A to 250 A having a uniformity such that at least 80% of the pore volume is made up of pores of from 0.6D to 1.4D, where D is the median pore diameter.Type: GrantFiled: October 12, 1979Date of Patent: March 24, 1981Assignee: E. I. Du Pont de Nemours and CompanyInventor: Horacio E. Bergna
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Patent number: 4217240Abstract: An amorphous aluminosilicate sol with uniform size particles is prepared by a process comprising (1) preparing a sol of discrete colloidal particles of uniform size, the surface of which consists of a coating of an aluminosilicate by separately and simultaneously adding a silica sol or an alkali metal silicate solution and an alkali metal aluminate solution to a heel sol of uniform-sized colloidal particles of aluminosilicate, silica or refractory metal oxide(s) at a certain rate of addition at constant pH of 9 to 12 and T of 50.degree. to 100.degree. C. to deposit or coat aluminosilicate onto surface of heel sol particles, (2) ion exchanging the alkali metal ions of the sol from (1) for ammonium ions, and (3) filtering the sol from (2) to remove the cation exchange resin and optionally concentrating the sol to a solids content of up to 60% by weight.Type: GrantFiled: December 16, 1977Date of Patent: August 12, 1980Assignee: E. I. Du Pont de Nemours and CompanyInventor: Horacio E. Bergna
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Patent number: 4162238Abstract: Compositions and method for producing foundry sand cores or molds of initial high strength but with essentially no strength after casting metals above 700.degree. C. which involves shaping and setting a composition containing foundry sand and a binder comprising sodium, potassium, or lithium silicate and sufficient amorphous silica so that the fraction of the total silica in the binder solution which is present as amorphous silica is from 2 to 75%, the amorphous silica having a particle size in the range from about 2 nanometers to 500 nanometers and the binder having a molar ratio of silica to alkali metal oxide ranging from 3.5:1 to 10.1.Type: GrantFiled: March 24, 1976Date of Patent: July 24, 1979Assignee: E. I. Du Pont de Nemours and CompanyInventor: Horacio E. Bergna
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Patent number: 4131542Abstract: A process for preparing a low-cost silica packing for chromatography is disclosed. The process involves spray-drying an aqueous silica sol containing from 5 to 60 weight percent silica, to form porous micrograins having a dense packing, acid-washing the porous micrograins, and sintering to effect a 5 to 20% loss in surface area.Type: GrantFiled: July 19, 1977Date of Patent: December 26, 1978Assignee: E. I. DuPont de Nemours and CompanyInventors: Horacio E. Bergna, Joseph J. Kirkland