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).

  • Publication number: 20230130969
    Abstract: 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: Application
    Filed: October 27, 2021
    Publication date: April 27, 2023
    Inventors: Alexandru Dutu, Vaibhav Ramakrishnan Ramachandran, Michael W. Boyer
  • Publication number: 20220206869
    Abstract: 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: Application
    Filed: December 28, 2020
    Publication date: June 30, 2022
    Inventors: VAIBHAV RAMAKRISHNAN RAMACHANDRAN, ALEXANDRU DUTU, BRADFORD BECKMANN
  • Patent number: 7303606
    Abstract: 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: Grant
    Filed: March 29, 2005
    Date of Patent: December 4, 2007
    Assignee: 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
  • Publication number: 20060204415
    Abstract: 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: Application
    Filed: May 10, 2006
    Publication date: September 14, 2006
    Inventors: Weibin Jiang, Seungdoo Park, Mark Tomczak, Divyanshu Acharya, Satish Tamhankar, Ramakrishnan Ramachandran
  • Patent number: 7090826
    Abstract: 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: Grant
    Filed: September 8, 2003
    Date of Patent: August 15, 2006
    Assignee: The BOC Group, Inc.
    Inventors: Weibin Jiang, Seungdoo Park, Mark S. Tomczak, Divyanshu R. Acharya, Satish S. Tamhankar, Ramakrishnan Ramachandran
  • Publication number: 20050223891
    Abstract: 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: Application
    Filed: March 29, 2005
    Publication date: October 13, 2005
    Inventors: Yongxian Zeng, Divyanshu Acharya, Satish Tamhankar, Narayanan Ramprasad, Ramakrishnan Ramachandran, Frank Fitch, Donald MacLean, Jerry Lin, Richard Clarke
  • Patent number: 6783749
    Abstract: 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: Grant
    Filed: May 13, 2002
    Date of Patent: August 31, 2004
    Assignee: The BOC Group, Inc.
    Inventors: Natarajan Narasimhan, Ramakrishnan Ramachandran, Satish S. Tamhankar, Weibin Jiang
  • Publication number: 20040120888
    Abstract: 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: Application
    Filed: September 8, 2003
    Publication date: June 24, 2004
    Inventors: Weibin Jiang, Seungdoo Park, Mark S. Tomczak, Divyanshu R. Acharya, Satish S. Tamhankar, Ramakrishnan Ramachandran
  • Patent number: 6743400
    Abstract: 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: Grant
    Filed: March 21, 2001
    Date of Patent: June 1, 2004
    Assignee: The BOC Group, Inc.
    Inventors: Ramakrishnan Ramachandran, Prabhu Balaraman
  • Publication number: 20030208960
    Abstract: 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: Application
    Filed: May 13, 2002
    Publication date: November 13, 2003
    Inventors: Natarajan Narasimhan, Ramakrishnan Ramachandran, Satish S. Tamhankar, Weibin Jiang
  • Publication number: 20030138747
    Abstract: 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: Application
    Filed: December 6, 2002
    Publication date: July 24, 2003
    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
  • Publication number: 20030037928
    Abstract: 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: Application
    Filed: May 16, 2001
    Publication date: February 27, 2003
    Inventors: Ramakrishnan Ramachandran, Kirk Walton Limbach, Shuen-Cheng Hwang
  • Publication number: 20020182123
    Abstract: 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: Application
    Filed: March 21, 2001
    Publication date: December 5, 2002
    Inventors: Ramakrishnan Ramachandran, Prabhu Balaraman
  • Patent number: 5993517
    Abstract: 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: Grant
    Filed: March 17, 1998
    Date of Patent: November 30, 1999
    Assignee: The Boc Group, Inc.
    Inventors: Yudong Chen, Akhilesh Kapoor, Ramakrishnan Ramachandran
  • Patent number: 5908804
    Abstract: 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: Grant
    Filed: September 5, 1997
    Date of Patent: June 1, 1999
    Assignee: The BOC Group, Inc.
    Inventors: Raghu K. Menon, Ramakrishnan Ramachandran
  • Patent number: 5814208
    Abstract: 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: Grant
    Filed: August 8, 1996
    Date of Patent: September 29, 1998
    Inventors: Raghu K. Menon, Ramakrishnan Ramachandran
  • Patent number: 5744687
    Abstract: 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: Grant
    Filed: April 22, 1994
    Date of Patent: April 28, 1998
    Assignee: The BOC Group, Inc.
    Inventors: Ramakrishnan Ramachandran, Loc H. Dao
  • Patent number: 5726327
    Abstract: 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: Grant
    Filed: September 27, 1996
    Date of Patent: March 10, 1998
    Assignee: The BOC Group, Inc.
    Inventors: Divyanshu R. Acharya, Ravi Kumar, Ramakrishnan Ramachandran
  • Patent number: 5693856
    Abstract: 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: Grant
    Filed: January 16, 1996
    Date of Patent: December 2, 1997
    Assignee: The BOC Group, Inc.
    Inventors: Ramakrishnan Ramachandran, Rustam H. Sethna, Satish S. Tamhankar
  • Patent number: 5675052
    Abstract: 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: Grant
    Filed: September 15, 1995
    Date of Patent: October 7, 1997
    Assignee: The BOC Group, Inc.
    Inventors: Raghu Menon, Ramakrishnan Ramachandran, Virginia Malik, Martin Bulow