Patents by Inventor Ramakrishnan Ramachandran
Ramakrishnan Ramachandran 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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Publication number: 20230130969Abstract: A memory includes two or more portions of memory circuitry and two or more processor in memory (PIM) functional blocks, each PIM functional block associated with a respective portion of the memory circuitry. In operation, at least one other PIM functional block other than a particular PIM functional block copies data from a source location accessible to the other PIM functional block. The other PIM functional block then provides the data to the particular PIM functional block. The particular acquires and stores the data in a destination location accessible to the particular PIM functional block. The particular PIM functional block next performs one or more PIM operations using the data.Type: ApplicationFiled: October 27, 2021Publication date: April 27, 2023Inventors: Alexandru Dutu, Vaibhav Ramakrishnan Ramachandran, Michael W. Boyer
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Publication number: 20220206869Abstract: Virtualizing resources of a memory-based execution device is disclosed. A host processing system orchestrates the execution of two or more offload tasks on a remote execution device. The remote execution device includes a memory array coupled to a processing unit that is shared by concurrent processes on the host processing system. The host processing system provides time-multiplexed access to the processing unit by each concurrent process for completing offload tasks on the processing unit. The host processing system initiates a context switch on the remote execution device from a first offload task to a second offload task. The context state of the first offload task is saved on the remote execution device.Type: ApplicationFiled: December 28, 2020Publication date: June 30, 2022Inventors: VAIBHAV RAMAKRISHNAN RAMACHANDRAN, ALEXANDRU DUTU, BRADFORD BECKMANN
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Patent number: 7303606Abstract: Production of oxygen-enriched gas streams is disclosed herein. Air streams contact an oxygen-selective mixed conductor particularly a perovskite material whereby oxygen is retained or adsorbed on the perovskite and can be employed in a variety of processes such as in combusting a fuel gas, heat recovery and boiler related operations.Type: GrantFiled: March 29, 2005Date of Patent: December 4, 2007Assignee: The BOC Group, Inc.Inventors: Yongxian Zeng, Divyanshu R. Acharya, Satish S. Tamhankar, Narayanan Ramprasad, Ramakrishnan Ramachandran, Frank R. Fitch, Donald L. MacLean, Jerry Y. S. Lin, Richard H. Clarke
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Publication number: 20060204415Abstract: An improved process for the catalytic partial oxidation of hydrocarbons to produce hydrogen and carbon monoxide and less than ˜2% carbon dioxide is disclosed. The process further permits the reaction to be initiated at room temperature, and utilizes a metal catalyst deposited on a ceria-coated zirconia monolith support, which exhibits high conversions of hydrocarbons to synthesis gas (hydrogen and carbon monoxide).Type: ApplicationFiled: May 10, 2006Publication date: September 14, 2006Inventors: Weibin Jiang, Seungdoo Park, Mark Tomczak, Divyanshu Acharya, Satish Tamhankar, Ramakrishnan Ramachandran
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Patent number: 7090826Abstract: An improved process for the catalytic partial oxidation of hydrocarbons to produce hydrogen and carbon monoxide and less than ˜2% carbon dioxide is disclosed. The process further permits the reaction to be initiated at room temperature, and utilizes a metal catalyst deposited on a ceria-coated zirconia monolith support, which exhibits high conversions of hydrocarbons to synthesis gas (hydrogen and carbon monoxide).Type: GrantFiled: September 8, 2003Date of Patent: August 15, 2006Assignee: The BOC Group, Inc.Inventors: Weibin Jiang, Seungdoo Park, Mark S. Tomczak, Divyanshu R. Acharya, Satish S. Tamhankar, Ramakrishnan Ramachandran
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Publication number: 20050223891Abstract: Production of oxygen-enriched gas streams is disclosed herein. Air streams contact an oxygen-selective mixed conductor particularly a perovskite material whereby oxygen is retained or adsorbed on the perovskite and can be employed in a variety of processes such as in combusting a fuel gas, heat recovery and boiler related operations.Type: ApplicationFiled: March 29, 2005Publication date: October 13, 2005Inventors: Yongxian Zeng, Divyanshu Acharya, Satish Tamhankar, Narayanan Ramprasad, Ramakrishnan Ramachandran, Frank Fitch, Donald MacLean, Jerry Lin, Richard Clarke
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Patent number: 6783749Abstract: Improved method for recovering hydrogen and carbon monoxide from hydrocarbon conversion processes are disclosed. A monolith catalyst reactor means is utilized in treating the waste gas stream from the hydrocarbon conversion process to assist in recovering hydrogen and carbon monoxide from the waste gas stream. The present invention also provides a method for improving the yield of hydrogen and carbon monoxide from a hydrocarbon conversion process utilizing a monolith catalyst reactor means.Type: GrantFiled: May 13, 2002Date of Patent: August 31, 2004Assignee: The BOC Group, Inc.Inventors: Natarajan Narasimhan, Ramakrishnan Ramachandran, Satish S. Tamhankar, Weibin Jiang
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Publication number: 20040120888Abstract: An improved process for the catalytic partial oxidation of hydrocarbons to produce hydrogen and carbon monoxide and less than ˜2% carbon dioxide is disclosed. The process further permits the reaction to be initiated at room temperature, and utilizes a metal catalyst deposited on a ceria-coated zirconia monolith support, which exhibits high conversions of hydrocarbons to synthesis gas (hydrogen and carbon monoxide).Type: ApplicationFiled: September 8, 2003Publication date: June 24, 2004Inventors: Weibin Jiang, Seungdoo Park, Mark S. Tomczak, Divyanshu R. Acharya, Satish S. Tamhankar, Ramakrishnan Ramachandran
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Patent number: 6743400Abstract: The present invention is directed to a sparger system provided for appropriately feeding reactant streams to fluidized bed reactors of hydrocarbon partial oxidation processes that are retrofitted to selectively recover and recycle unreacted hydrocarbons. As a result of the sparger system, the reactor productivity and selectivity is enhanced while employing only two spargers. Also, the capital cost required for retrofitting existing sparging equipment is minimized, while at the same time, the desired fluidization and catalyst oxidation characteristics are achieved without the formation of flammable mixtures within the sparging system.Type: GrantFiled: March 21, 2001Date of Patent: June 1, 2004Assignee: The BOC Group, Inc.Inventors: Ramakrishnan Ramachandran, Prabhu Balaraman
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Publication number: 20030208960Abstract: Improved method for recovering hydrogen and carbon monoxide from hydrocarbon conversion processes are disclosed. A monolith catalyst reactor means is utilized in treating the waste gas stream from the hydrocarbon conversion process to assist in recovering hydrogen and carbon monoxide from the waste gas stream. The present invention also provides a method for improving the yield of hydrogen and carbon monoxide from a hydrocarbon conversion process utilizing a monolith catalyst reactor means.Type: ApplicationFiled: May 13, 2002Publication date: November 13, 2003Inventors: Natarajan Narasimhan, Ramakrishnan Ramachandran, Satish S. Tamhankar, Weibin Jiang
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Publication number: 20030138747Abstract: Production of oxygen-enriched gas streams is disclosed herein. Air streams contact an oxygen-selective mixed conductor particularly a perovskite material whereby oxygen is retained or adsorbed on the perovskite and can be employed in a variety of processes such as in combusting a fuel gas, heat recovery and boiler related operations.Type: ApplicationFiled: December 6, 2002Publication date: July 24, 2003Inventors: Yongxian Zeng, Divyanshu R. Acharya, Satish S. Tamhankar, Narayanan Ramprasad, Ramakrishnan Ramachandran, Frank R. Fitch, Donald L. MacLean, Jerry Y.S. Lin, Richard H. Clarke
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Publication number: 20030037928Abstract: A method for enhancing the recovery of oil from underground formations is disclosed. A gas mixture which contains greater than 50% by volume carbon dioxide, the remainder being an inert gas, is injected in the underground formation to lower the oil viscosity and surface tension and increase the oil swelling. Preferably, the gas mixture contains greater than 60% by volume carbon dioxide with a gas mixture containing greater than 70% by volume carbon dioxide preferred.Type: ApplicationFiled: May 16, 2001Publication date: February 27, 2003Inventors: Ramakrishnan Ramachandran, Kirk Walton Limbach, Shuen-Cheng Hwang
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Publication number: 20020182123Abstract: The present invention is directed to a sparger system provided for appropriately feeding reactant streams to fluidized bed reactors of hydrocarbon partial oxidation processes that are retrofitted to selectively recover and recycle unreacted hydrocarbons. As a result of the sparger system, the reactor productivity and selectivity is enhanced while employing only two spargers. Also, the capital cost required for retrofitting existing sparging equipment is minimized, while at the same time, the desired fluidization and catalyst oxidation characteristics are achieved without the formation of flammable mixtures within the sparging system.Type: ApplicationFiled: March 21, 2001Publication date: December 5, 2002Inventors: Ramakrishnan Ramachandran, Prabhu Balaraman
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Patent number: 5993517Abstract: High purity carbon monoxide is separated from a gas stream containing carbon monoxide, carbon dioxide, methane, hydrogen and possibly other impurities by a two-stage pressure swing adsorption process carried out in a series of adsorption vessels containing adsorbent which adsorbs carbon monoxide more readily than other components of the gas stream. The first adsorption vessel in the series is cocurrently purged with nonadsorbed product stream from the second vessel and the purge effluent from the first stage adsorption vessels is reintroduced into the first adsorption vessels as feed gas.Type: GrantFiled: March 17, 1998Date of Patent: November 30, 1999Assignee: The Boc Group, Inc.Inventors: Yudong Chen, Akhilesh Kapoor, Ramakrishnan Ramachandran
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Patent number: 5908804Abstract: Coke is burned in the regenerator vessel of an FCC complex with a combustion medium consisting of a diluent gas, such as air, enriched with oxygen, The regenerator is operated in partial combustion mode and excess oxygen is introduced into the combustion zone of the regenerator. Emission of nitrogen oxides to the atmosphere is reduced.Type: GrantFiled: September 5, 1997Date of Patent: June 1, 1999Assignee: The BOC Group, Inc.Inventors: Raghu K. Menon, Ramakrishnan Ramachandran
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Patent number: 5814208Abstract: Hydrocarbon fluid catalytic cracking (FCC) plants are debottlenecked by subjecting part or all of the wet gas stream leaving the main fractionator overhead receiver to pressure swing adsorption to remove methane and hydrogen from this gas stream prior to its introduction into the wet gas compressor. This allows debottlenecking of the compressor system. It can allow the reduction in pressure in the system back to the catalyst regenerator. The reduction in pressure in the catalyst regenerator makes it possible to increase the rate of regeneration of catalyst. Consequently, the rate of hydrocarbon throughput in the FCC plant can be increased.Type: GrantFiled: August 8, 1996Date of Patent: September 29, 1998Inventors: Raghu K. Menon, Ramakrishnan Ramachandran
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Patent number: 5744687Abstract: A hydrocarbon stream is cracked to produce a hot gaseous stream which is compressed and cooled to condense almost all of the hydrocarbons contained in the stream. A noncondensed stream remaining after the condensation step, comprised predominantly of hydrogen and C.sub.1 to C.sub.3 hydrocarbons, is subjected to pressure swing adsorption or temperature swing adsorption at an adsorption temperature of about 0.degree. to about 250.degree. C. in a bed of adsorbent which selectively adsorbs ethylene and propylene, thereby adsorbing substantially all of the ethylene and propylene from the gas stream. The ethylene and/or propylene is recovered upon bed regeneration.Type: GrantFiled: April 22, 1994Date of Patent: April 28, 1998Assignee: The BOC Group, Inc.Inventors: Ramakrishnan Ramachandran, Loc H. Dao
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Patent number: 5726327Abstract: Petrochemicals are produced by the vapor phase reaction of a hydrocarbon with air in the presence of a suitable catalyst. The petrochemical product is removed from the product gas stream, and unreacted hydrocarbon in part or all of the remaining gas stream is recovered by subjecting the gas stream to a TSA process in which the adsorbed hydrocarbon is desorbed at elevated pressure by purging the adsorbent with hot compressed air, the air being heated by compression. The compressed air-desorbed hydrocarbon mixture is recycled to the reactor.Type: GrantFiled: September 27, 1996Date of Patent: March 10, 1998Assignee: The BOC Group, Inc.Inventors: Divyanshu R. Acharya, Ravi Kumar, Ramakrishnan Ramachandran
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Patent number: 5693856Abstract: Terephthalic acid is produced by reacting paraxylene with oxygen in a reactor having several vertical stages, the reaction taking place in the liquid phase using acetic acid as solvent and a cobalt-manganese-bromine complex catalyst. During the reaction, a carbon dioxide-containing gas phase is withdrawn from the vapor space of the reactor. The gas phase is cooled to condense vaporized acetic acid therefrom and carbon dioxide is separated from the gas phase and recycled to the vapor space or to the liquid phase or to both of these. In an alternate embodiment, the gas remaining after condensing acetic acid is subjected to catalytic oxidation to oxidize carbon monoxide and methane, if present, to carbon dioxide, and some or all of the carbon dioxide is recycled to the reactor.Type: GrantFiled: January 16, 1996Date of Patent: December 2, 1997Assignee: The BOC Group, Inc.Inventors: Ramakrishnan Ramachandran, Rustam H. Sethna, Satish S. Tamhankar
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Patent number: 5675052Abstract: A hydrocarbon stream is cracked to produce a hot gaseous stream which is compressed and cooled to condense almost all of the hydrocarbons contained in the stream. A noncondensed stream remaining after the condensation step, comprised predominantly of hydrogen and C.sub.1 to C.sub.3 hydrocarbons, is subjected to pressure swing adsorption or temperature swing adsorption at an adsorption temperature of about 0.degree. to about 250.degree. C. in a bed of adsorbent which selectively adsorbs ethene and propene, thereby adsorbing substantially all of the ethene and propene from the gas stream. The ethene and/or propene is recovered upon bed regeneration. Higher alkenes are separated from alkanes by various methods.Type: GrantFiled: September 15, 1995Date of Patent: October 7, 1997Assignee: The BOC Group, Inc.Inventors: Raghu Menon, Ramakrishnan Ramachandran, Virginia Malik, Martin Bulow