Patents by Inventor Robert K. Preuss
Robert K. Preuss 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: 4154689Abstract: The disclosure teaches an improvement in the filtration of molten metal especially aluminum using a removable vertically disposed filter plate and at least one fluxing gas inlet positioned in such a manner so as to introduce fluxing gas into the filter plate. The filter plate is provided with a bevelled peripheral surface mating with a like bevelled surface in a filter chamber so that the filter plate can be conveniently inserted in the chamber and removed therefrom. Fluxing gas is provided to the melt through the inlet and flows through the filter plate so as to assure extensive contact with the melt. Dissolved gases and non-metallic inclusions are thereby abstracted and removed from the melt.Type: GrantFiled: July 29, 1977Date of Patent: May 15, 1979Assignee: Swiss Aluminium Ltd.Inventors: John C. Yarwood, James E. Dore, Robert K. Preuss
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Patent number: 4092153Abstract: The disclosure teaches an improvement in the filtration of molten metal especially aluminum using a removable vertically disposed filter plate and at least one fluxing gas inlet positioned in such a manner so as to introduce fluxing gas into the filter plate. The filter plate is provided with a bevelled peripheral surface mating with a like bevelled surface in a filter chamber so that the filter plate can be conveniently inserted in the chamber and removed therefrom. Fluxing gas is provided to the melt through the inlet and flows through the filter plate so as to assure extensive contact with the melt. Dissolved gases and non-metallic inclusions are thereby abstracted and removed from the melt.Type: GrantFiled: August 24, 1977Date of Patent: May 30, 1978Assignee: Swiss Aluminium LimitedInventors: John C. Yarwood, James E. Dore, Robert K. Preuss
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Patent number: 4081371Abstract: The disclosure teaches an improvement in the filtration of molten metal, especially aluminum, using a removable filter plate. The filter plate is provided with a bevelled peripheral surface mating with a like bevelled surface in a filter chamber so that the filter plate can be conveniently inserted in the chamber and removed therefrom.Type: GrantFiled: September 30, 1976Date of Patent: March 28, 1978Assignee: Swiss Aluminium Ltd.Inventors: John C. Yarwood, James E. Dore, Robert K. Preuss
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Patent number: 4075303Abstract: Ceramic foams possessing controlled permeability and uniformity are prepared by a combined rolling operation of impregnating an open-celled organic polymer foam material possessing a predetermined permeability and resilience with a fluid aqueous slurry of a thixotropic ceramic composition and immediate passage through at least two controlled roll gaps, wherein the rolls are preset to effect a temporary compression ranging from about 50 to 90% for the first pass and 70 to 90% for the second pass. The resulting material is thereby uniformly impregnated with the required amount of slurry, and is then dried and heated to remove the organic foam component. The foams prepared in accordance with the present invention are useful as filters for molten metals, especially aluminum and its alloys.Type: GrantFiled: February 22, 1977Date of Patent: February 21, 1978Assignee: Swiss Aluminium Ltd.Inventors: John C. Yarwood, James E. Dore, Robert K. Preuss
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Patent number: 4052198Abstract: The disclosure teaches an improvement in the degassing and filtration of molten metal, especially aluminum, using an apparatus which employs a pair of sequentially placed, removable filter-type plates and at least one fluxing gas inlet positioned therebetween. Fluxing gas is provided to the melt through the inlet and flows upward through the first of said plates into counter-current contact with the melt. Said plate serves to break up said fluxing gas into a fine dispersion to assure its intimate and extensive contact with the melt. Dissolved gases and non-metallic inclusions are thereby abstracted and removed from the melt.Type: GrantFiled: December 6, 1976Date of Patent: October 4, 1977Assignee: Swiss Aluminium LimitedInventors: John C. Yarwood, James E. Dore, Robert K. Preuss
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Patent number: 4032124Abstract: The disclosure teaches an improvement in the degassing and filtration of molten metal, especially aluminum, using an apparatus which employs a pair of sequentially placed, removable filter-type plates and at least one fluxing gas inlet positioned therebetween. Fluxing gas is provided to the melt through the inlet and flows upward through the first of said plates into counter-current contact with the melt. Said plate serves to break up said fluxing gas into a fine dispersion to assure its intimate and extensive contact with the melt. Dissolved gases and non-metallic inclusions are thereby abstracted and removed from the melt.Type: GrantFiled: February 2, 1976Date of Patent: June 28, 1977Assignee: Swiss Aluminium Ltd.Inventors: John C. Yarwood, James E. Dore, Robert K. Preuss
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Patent number: 4024212Abstract: Ceramic foams possessing controlled permeability and uniformity are prepared by the impregnation of an open-celled organic polymer foam material possessing a predetermined permeability and resilience with a aqueous slurry of a thixotropic ceramic composition while shearing said slurry an amount sufficient to maximize said impregnation, and expelling excess slurry from said material by conducting at least two passes of said material through preset rollers to effect a temporary compression ranging from about 50 to 90% for the first pass and 70 to 90% for the second pass. The resulting material is then dried and heated to remove the organic foam component. The foams prepared in accordance with the present invention are useful as filters for molten aluminum.Type: GrantFiled: June 23, 1975Date of Patent: May 17, 1977Assignee: Swiss Aluminium Ltd.Inventors: James E. Dore, John C. Yarwood, Robert K. Preuss
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Patent number: 4024056Abstract: The disclosure teaches an improvement in the filtration of molten metal, especially aluminum, using a removable filter plate. The filter plate is provided with a bevelled peripheral surface mating with a like bevelled surface in a filter chamber so that the filter plate can be conveniently inserted in the chamber and removed therefrom.Type: GrantFiled: July 21, 1975Date of Patent: May 17, 1977Assignee: Swiss Aluminium Ltd.Inventors: John C. Yarwood, James E. Dore, Robert K. Preuss
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Patent number: 3962081Abstract: The disclosure teaches an improved ceramic foam filter particularly useful for filtering molten metal, and also a method for filtering molten metal. The filter is characterized by a combination of properties which makes it particularly suitable for use in filtering molten metal.Type: GrantFiled: March 28, 1975Date of Patent: June 8, 1976Assignee: Swiss Aluminium Ltd.Inventors: John C. Yarwood, James E. Dore, Robert K. Preuss