Patents Assigned to Porvair PLC
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Publication number: 20170050885Abstract: An improved porous ceramic foam filter, and method of making the porous ceramic foam filter is provided. The porous ceramic foam filter comprising 28-78 wt % alumina; 18-78 wt % silica; and 1-15 wt % Group II oxide.Type: ApplicationFiled: May 11, 2015Publication date: February 23, 2017Applicant: PORVAIR PLCInventors: Rudolph A. OLSON, III, Matt W. WILLER, Mark J. TOPOLSKI
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Patent number: 9504944Abstract: A filter which is particularly suitable for filtration of molten metal, and method of making the filter, is described. The filter comprises a ceramic core comprising a primary component selected from the group consisting of alumina and magnesium oxide. A coating is on the ceramic core wherein the coating is selected from the group consisting of BN and Y2O3.Type: GrantFiled: June 5, 2014Date of Patent: November 29, 2016Assignee: Porvair PlcInventors: Leonard S. Aubrey, Feng Chi, Lucas Damoah
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Patent number: 9458523Abstract: An improved filter is described which is particularly suitable for filtering molten metal. The filter has a porous open celled ceramic foam body with voids separated by struts wherein a portion of the struts are densified with glass.Type: GrantFiled: August 24, 2010Date of Patent: October 4, 2016Assignee: Porvair PlcInventors: Rudolph A. Olson, III, Matthew W. Willer, Leonard S. Aubrey
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Publication number: 20140348693Abstract: A casting system for molding metal. The casting system has a mold comprising a cavity in a predefined shape. A riser in flow communication with the mold wherein the riser provides molten metal to said cavity as the molten metal freezes. A riser breaker insert is between the mold and the riser wherein the riser breaker insert comprises voids. A molten metal supply is provided which is capable of filling the mold and the voids of said riser breaker insert and at least partially filling the riser.Type: ApplicationFiled: May 16, 2014Publication date: November 27, 2014Applicant: Porvair PLCInventors: Donald B. Craig, Christopher J. Mann, David P. Haack, James R. Schmahl
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Patent number: 8518528Abstract: A ceramic foam filter for molten aluminum alloys comprising an alumina silicate rich core and a boron glass shell and a chemical composition comprising: 20-70 wt % Al2O3, 20-60 wt % SiO2, 0-10 wt % CaO, 0-10 wt %; MgO and 2-20 wt % B2O3.Type: GrantFiled: April 2, 2007Date of Patent: August 27, 2013Assignee: Porvair PLCInventors: Feng Chi, David P. Haack, Leonard S. Aubrey
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Patent number: 8486176Abstract: A method for filtering molten aluminum and aluminum alloys. The method includes providing a reticulated foam wherein oxygen is introduced to an interior of the reticulated foam. Molten aluminum or aluminum alloy is passed through the reticulated foam wherein oxygen is maintained at a partial pressure of at least 2.51×10?35 atm during filtration.Type: GrantFiled: June 16, 2009Date of Patent: July 16, 2013Assignee: Porvair PLCInventor: Leonard S. Aubrey
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Publication number: 20120175804Abstract: A ceramic foam filter for molten aluminum alloys comprising an alumina silicate rich core and a boron glass shell and a chemical composition comprising: 20-70 wt % Al2O3, 20-60 wt % SiO2, 0-10 wt % CaO, 0-10 wt %; MgO and 2-20 wt % B2O3.Type: ApplicationFiled: March 19, 2012Publication date: July 12, 2012Applicant: Porvair PLCInventors: Feng Chi, David P. Haack, Leonard S. Aubrey
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Patent number: 8202346Abstract: A method for filtering molten magnesium or magnesium alloys is provided. The method includes the steps of: providing an organic foam; impregnating the organic foam with a slurry comprising metal particles; heating the impregnated organic foam to a temperature sufficient to volatilize the organic foam thereby forming a porous metal foam comprising no more than 0.5 wt % nickel; sintering the porous metal foam; passing molten magnesium or magnesium alloy through the porous metal foam thereby forming purified molten magnesium or magnesium alloy; and cooling the purified molten magnesium or magnesium alloy.Type: GrantFiled: June 24, 2009Date of Patent: June 19, 2012Assignee: Porvair, PLCInventor: Leonard S. Aubrey
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Patent number: 7718114Abstract: A ceramic precursor, and ceramic filter prepared therewith, with 35-70 wt % refractory aluminosilicate; 10-30 wt % colloidal silica; 0-2 wt % modified bentonite; 0-35 wt % fumed silica; 0-10 wt % pore formers and liquid.Type: GrantFiled: August 4, 2006Date of Patent: May 18, 2010Assignee: Porvair PLCInventors: Rudolph A. Olson, III, Leonard S. Aubrey, Feng Chi, Christopher J. Plantec, Myron K. Redden, David P. Haack
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Publication number: 20100113244Abstract: A ceramic foam filter for molten aluminum alloys comprising an alumina silicate rich core and a boron glass shell and a chemical composition comprising: 20-70 wt % Al2O3, 20-60 wt % SiO2, 0-10 wt % CaO, 0-10 wt %; MgO and 2-20 wt % B2O3.Type: ApplicationFiled: April 2, 2007Publication date: May 6, 2010Applicant: PORVAIR PLCInventors: Feng Chi, David P. Haack, Leonard S. Aubrey
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Patent number: 7585455Abstract: A degasser (10) for molten metal with a microporous plate (11). The microporous plate has at least one internal passageway (13) and an interface tube (12) attached to the microporous plate in flow communication with the internal passageway.Type: GrantFiled: June 16, 2008Date of Patent: September 8, 2009Assignee: Porvair PLCInventor: Leonard S. Aubrey
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Patent number: 7328831Abstract: A method of making an article that is comprised of a metal foam in contact with a base metal by an intermediate braze composition, in particular, a method of brazing a metal foam to a base metal via a braze composition. In one preferred method, a polymeric foam is coated with a powdered metal composition and thermally-treated to volatilize the polymeric foam and form an open-cell metal foam. A second polymeric foam is coated with a braze composition. The second coated polymeric foam is thermally-treated to volatilize the polymeric foam. The metal foam is surrounded by the second coated polymeric foam to form a composite metal foam. The composite metal foam is placed in contact with a base metal to form an article. The article is thermally-treated to a brazing temperature to form a brazed metal article.Type: GrantFiled: June 25, 2004Date of Patent: February 12, 2008Assignee: Porvair PLCInventor: Mark J. Topolski
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Patent number: 7316721Abstract: A canister for maintaining entrained particles in a gas stream passing there through. The canister has an outer annular member and an inner porous annular member. The inner porous annular member has rings with at least one expansion zone in each ring. An annular interior volume is between the outer annular member and the inner porous annular member. A gas source is in flow communication with the annular interior volume for providing gas at a pressure sufficient to pass through the inner porous annular member to dislodge particles adhering thereto.Type: GrantFiled: January 28, 2005Date of Patent: January 8, 2008Assignee: Porvair, PLCInventors: Myron K. Redden, Rudolph A. Olson, III
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Patent number: 6977058Abstract: A strainer for molten metal. The strainer comprises a well and a multiplicity of passages. Each passage comprises a first cavity a second cavity with a smaller equivalent diameter than the first cavity. A neck is between the first cavity and second cavity. An inoculation pellet is received in the well.Type: GrantFiled: March 11, 2003Date of Patent: December 20, 2005Assignee: Porvair PLCInventors: Leonard S. Aubrey, Donald B. Craig, Steven H. Martin
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Patent number: 6793707Abstract: A method for inoculating molten iron. The method comprises passing the molten iron through a filter assembly at an approach velocity of about 1 to about 60 cm/sec. The filter assembly comprises a filter element and an inoculation pellet in contact with the filter element. The pellet has an inoculant dissolution rate of at least 1 mg/sec. to no more than 320 mg/sec. and comprises about 40-99.9%, by weight, carrier comprising ferrosilicon. The pellet further comprises about 0.1-60%, by weight, at least one inoculating agent selected from a group consisting of cerium, strontium, zirconium, calcium, manganese, barium, bismuth, magnesium, titanium and aluminum or from rare earths.Type: GrantFiled: January 10, 2002Date of Patent: September 21, 2004Assignees: Pechiney Electrometallurgie, Porvair PLCInventors: Donald B. Craig, Leonard S. Aubrey, Thomas J. Margaria
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Patent number: 6706239Abstract: A method of co-forming a metal article comprising forming a powdered metal component from a first powdered metal composition, providing a polymeric foam, coating the polymeric foam with a second powdered metal composition to form a coated polymeric foam, placing the coated polymeric foam in contact with the powdered metal component to form a composite, and heat-treating the composite to volatilize the polymeric foam and to solidify the powdered metal component. The powdered metal composition of the powdered metal component can be the same or different than the powdered metal composition used to coat the polymeric foam. The resulting co-formed metal article can be in a variety of configurations including, but not limited to, metal foam on the inside or outside surfaces of a metal tube and metal foam on one or more faces of a metal plate.Type: GrantFiled: February 5, 2001Date of Patent: March 16, 2004Assignee: Porvair PLCInventors: David P. Haack, Chi-Li Lin, Michael Speckert
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Patent number: 6139929Abstract: There is disclosed a composite sock which consists of an inner stretchable fabric envelope, a bag-like barrier component which is liquid water impermeable, and water vapour permeable, and a second or outer stretchable fabric envelope. The inner envelope is attached to the barrier component, the barrier component is attached to the outer envelope, the arrangement being such as to allow circumferential stretching of the composite sock. The inner stretchable fabric envelope or the outer stretchable fabric envelope or both is a circular knitted sock. The composite sock has elastic properties such that it can be stretched at least in the X direction to at least 50% extension, and such that when a sample taken from the leg of the composite sock just above the ankle, the sample being 5 cm by 10 cm with the 10 cm dimension aligned in the X direction is extended on a tensometer at 100 mm per minute to 15 cms length (i.e.Type: GrantFiled: September 3, 1999Date of Patent: October 31, 2000Assignee: Porvair PLCInventors: Karen C. Hayton, Ian Stirling
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Patent number: 6051191Abstract: There is disclosed a microplate affording an array of discrete, separate sample wells in which each sample well consists of a well of a first polymer composition, the well having side walls and a base, and being located in a matrix of a second polymer composition, the second polymer composition being opaque, the said matrix shrouding the side walls of the said well and extending beyond the ends of the side walls of the wells, each well being thermally bonded to the matrix of the second polymer composition, so as to form an integral structure.Type: GrantFiled: November 17, 1997Date of Patent: April 18, 2000Assignees: Porvair PLC, Wallac OyInventor: Richard Michael Ireland
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Patent number: 5244716Abstract: A composite extensible material useful for making a clothing article comprising a first film layer resistant to penetration by liquid water by permeable to water vapor adhered at discrete securement locations to a second layer of water vapor vapor permeable extensible sheet material. The adherence between the two layers is such that when the composite material is under zero stretching load and resting on a flat surface the second layer is substantially flat and the first layer is corrugated, ruched or puckered. The adherence is also such that the composite material can be stretched by at least 10% in at least one direction by a load less than that required to stretch the first layer by the same amount on its own.Type: GrantFiled: December 4, 1989Date of Patent: September 14, 1993Assignee: Porvair PLCInventors: Jeremy J. Thornton, Allen Halliwell