Patents by Inventor Pronob Bardhan
Pronob Bardhan 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: 7384442Abstract: A ceramic wall-flow filter for filtering particulate matter from gases and methods for manufacturing such wall-flow filters are disclosed. The filter includes an array of porous ceramic walls defining a pattern of end-plugged inlet and outlet cells, and heat absorbing elements disposed within at least some of the outlet cells such that a bulk heat capacity of the outlet cells is greater than a bulk capacity of the inlet cells. The heat absorbing elements increase a bulk heat capacity of the filter without substantially interfering with a flow of gas through the porous ceramic walls by allowing thinner walls. According to the method, during the step of extruding or thereafter, heat absorbing elements are formed within at least some of the outlet cells such that a heat capacity of the outlet cells is greater than the inlet cells.Type: GrantFiled: February 28, 2005Date of Patent: June 10, 2008Assignee: Corning IncorporatedInventors: Pronob Bardhan, Douglas Munroe Beall, Kenneth Richard Miller, John Forrest Wight, Jr.
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Publication number: 20080083334Abstract: This invention is directed to a method and system for removing ash, particularly a heat-treated ash deposit from a filter. At least a majority (e.g., greater than 50 wt %) of the ash is removed as a result of the process. The filter containing the ash deposit is contacted with an acid composition to remove a majority of the ash, and the acid-contacted filter is then treated to remove at least a portion of the acid.Type: ApplicationFiled: October 6, 2006Publication date: April 10, 2008Inventors: Pronob Bardhan, Weiguo Miao, Joseph James St. Angelo, Benjamin Allen Stevens
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Publication number: 20060191248Abstract: A ceramic wall-flow filter for filtering particulate matter from gases and methods for manufacturing such wall-flow filters are disclosed. The filter includes an array of porous ceramic walls defining a pattern of end-plugged inlet and outlet cells, and heat absorbing elements disposed within at least some of the outlet cells such that a bulk heat capacity of the outlet cells is greater than a bulk capacity of the inlet cells. The heat absorbing elements increase a bulk heat capacity of the filter without substantially interfering with a flow of gas through the porous ceramic walls by allowing thinner walls. According to the method, during the step of extruding or thereafter, heat absorbing elements are formed within at least some of the outlet cells such that a heat capacity of the outlet cells is greater than the inlet cells.Type: ApplicationFiled: February 28, 2005Publication date: August 31, 2006Inventors: Pronob Bardhan, Douglas Beall, Kenneth Miller, John Wight
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Patent number: 6994972Abstract: A planar, rigid substrate made from a porous, inorganic material coated with cationic polymer molecules for attachment of an array of biomolecules, such as DNA, RNA, oligonucleotides, peptides, and proteins. The substrate has a top surface with about at least 200 to about 200,000 times greater surface area than that of a comparable, non-porous substrate. The cationic polymer molecules are anchored on the top surface and in the pores of the porous material. In high-density applications, an array of polynucleotides of a known, predetermined sequence is attached to this cationic polymer layer, such that each of the polynucleotide is attached to a different localized area on the top surface. The top surface has a surface area for attaching biomolecules of approximately 387,500 cm2/cm2 of area (˜7.5 million cm2/1×3 inch piece of substrate). Each pore of the plurality of pores in the top surface of the substrate has a pore radius of between about 40 ? to about 75 ?.Type: GrantFiled: March 18, 2002Date of Patent: February 7, 2006Assignee: Corning IncorporatedInventors: Pronob Bardhan, Dana C. Bookbinder, Joydeep Lahiri, Cameron W. Tanner, Patrick D. Tepesch, Raja R. Wusirika
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Publication number: 20020142339Abstract: A planar, rigid substrate made from a porous, inorganic material coated with cationic polymer molecules for attachment of an array of biomolecules, such as DNA, RNA, oligonucleotides, peptides, and proteins. The substrate has a top surface with about at least 200 to about 200,000 times greater surface area than that of a comparable, non-porous substrate. The cationic polymer molecules are anchored on the top surface and in the pores of the porous material. In high-density applications, an array of polynucleotides of a known, predetermined sequence is attached to this cationic polymer layer, such that each of the polynucleotide is attached to a different localized area on the top surface. The top surface has a surface area for attaching biomolecules of approximately 387,500 cm2/cm2 of area (˜7.5 million cm2/1×3 inch piece of substrate). Each pore of the plurality of pores in the top surface of the substrate has a pore radius of between about 40 Å to about 75 Å.Type: ApplicationFiled: March 18, 2002Publication date: October 3, 2002Inventors: Pronob Bardhan, Dana C. Bookbinder, Joydeep Lahiri, Cameron W. Tanner, Patrick D. Tepesch, Raja R. Wusirika
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Patent number: 5004713Abstract: Bismuth-containing temperature-stable dielectric ceramics are disclosed herein that are stable over a wide range of frequencies, and thus are suitable for ceramic capacitors and microwave dielectrics. This class of materials is defined by the formula Bi.sub.2 O.sub.3 xTiO.sub.2 wherein x ranges up to 7 and the Ti.sup.4+ ion may be replaced with mixed ions of equivalent charge, thus maintaining charge balance. Suitable replacements for the Ti.sup.4+ ion are: A.sub.1/3.sup.2+ B.sub.2/3.sup.5+, R.sub.2/3.sup.3+ C.sub.1/3.sup.6+, A.sub.1/2.sup.2+ C.sub.1/2.sup.6+, R.sub.1/2.sup.3+ B.sub.1/2.sup.5+, M.sub.1/4.sup.1+ B.sub.3/4.sup.5+, and M.sub.2/5 .sup.1+ C.sub.3/5.sup.6+ ; where M.sup.+ is selected from the group consisting of Li.sup.+, Na.sup.+, K.sup.+, Cu.sup.+, and Ag.sup.+ ; A.sup.2+ is selected from the group consisting of Mg.sup.2+, Zn.sup.2+, Ni.sup.2+ , Co.sup.2+, Cu.sup.2+, and Cd.sup.2+ ; R.sup.3+ is selected from the group consisting of Cr.sup.3+, Mn.sup.3+, Fe.sup.3+, Al.sup.3+, Ga.sup.3+, Zn.sup.Type: GrantFiled: July 5, 1989Date of Patent: April 2, 1991Assignee: Corning IncorporatedInventors: Pronob Bardhan, Chyang J. Yu
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Patent number: 4978646Abstract: This invention relates to the production of ceramic materials which exhibit a dielectric constant in excess of 105, when measured at room temperature, and a small temperature coefficient of capacitance across the temperature range of -55.degree. to 125.degree. C., when compared to the capacitance measured at room temperature, which material has a composition encompassed within one of the following general formulae:(Bi.sub.2 O.sub.2).sup.2+ (A.sub.m-1 B.sub.m O.sub.3m+1).sup.2- ; (I)(Bi.sub.2 O.sub.2).sup.2+ (A.sub.m-1 B.sub.m Zr.sub..beta. O.sub.3m+.delta.+1).sup.2- ; and (II)(Bi.sub.2 O.sub.2).sup.2+ (A.sub.m-1 B.sub.m Mn.sub..gamma. O.sub.3m+.delta.+1).sup.2- (III)(Bi.sub.2 O.sub.2).sup.2+ (A.sub.m-1 B.sub.m Zr.sub..beta. Mn.sub..gamma. O.sub.3m+.delta.+1).sup.Type: GrantFiled: March 3, 1989Date of Patent: December 18, 1990Assignee: Corning IncorporatedInventors: Pronob Bardhan, Roger F. Bartholomew, Donald M. Trotter, Jr., Chyang J. Yu
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Patent number: 4725391Abstract: A method is disclosed for extruding thin-walled ceramic bodies. The method involves mixing into a homogenized batch a granular ceramic, a binder, a soluble oxidizing agent and a matrix precursor in amounts sufficient to provide a substantially water-free extrudable mixture. The batch is extruded into an atmosphere containing SO.sub.2 which permeates the extrudate and reacts with the oxidizing agent to form SO.sub.3 in situ. The SO.sub.3 catalyzes polymerization of the furfuryl alcohol to a rigid solid which prevents deformation of the extrudate.Type: GrantFiled: February 10, 1984Date of Patent: February 16, 1988Assignee: Corning Glass WorksInventors: Pronob Bardhan, Carlo M. Golino, Larry D. Gorges, Sandra L. Morse
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Patent number: 4719187Abstract: This invention is directed to the production of nitride-based ceramic bodies selected from the group of AlN and Si.sub.3 N.sub.4 which can be sintered to near theoretical densities at temperatures at least 200.degree. C. lower than those required for the pure materials. Such bodies are densified through the addition of a metal fluoride selected from the group of aluminum, barium, calcium, srtrontium, yttrium, the lanthanide rare earth metals, and mixtures thereof. Up to 80% by weight of said metal fluoride may be included but, generally, such additions will be held between 5-30% by weight. AlN bodies exhibiting very high thermal conductivity can be prepared by sintering with a metal fluoride selected from the group of barium, calcium, strontium, yttrium, the lanthanide rare earth metals, and mixtures thereof.Type: GrantFiled: December 3, 1986Date of Patent: January 12, 1988Assignee: Corning Glass WorksInventors: Pronob Bardhan, Gregory A. Merkel
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Patent number: 4712156Abstract: There is disclosed a ceramic ferroelectric material consisting basically of lead magnesium niobate, lead nickel niobate lead titanate, having a stabilized perovskite crystal phase, having a high dielectric constant with a broad or diffuse ferroelectric to paraelectric phase transition, and adapted to being fired at temperatures up to 1200.degree. C. Numerous additives and their effects on dielectric properties are also disclosed.Type: GrantFiled: February 11, 1987Date of Patent: December 8, 1987Assignee: Corning Glass WorksInventor: Pronob Bardhan
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Patent number: 4631268Abstract: A method of forming a monolithic ceramic catalyst support having a high surface area phase of porous oxide embedded within the monolith structure is provided. The porous oxide phase is incorporated into a sinterable ceramic structure as a discrete discontinuous phase. The high surface area necessary for effective catalyst support is thereby provided within the ceramic structure, which is sintered to provide appreciable density and strength.Type: GrantFiled: March 18, 1985Date of Patent: December 23, 1986Assignee: Corning Glass WorksInventors: Irwin M. Lachman, Pronob Bardhan, Lawrence A. Nordlie