Patents by Inventor Sairam Sundaram

Sairam Sundaram 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).

  • Patent number: 9561986
    Abstract: An article includes a silicon-containing region; at least one outer layer overlying a surface of the silicon-containing region; and a constituent layer on the surface of the silicon-containing region and between and contacting the silicon-containing region and the at least one outer layer, the constituent layer being formed by constituents of the silicon-containing region and being susceptible to creep within an operating environment of the article, wherein the silicon-containing region defines a plurality of channels and a plurality of ridges that interlock within the plurality of channels are formed in the silicon-containing region to physically interlock the at least one outer layer with the silicon-containing region through the constituent layer.
    Type: Grant
    Filed: October 31, 2013
    Date of Patent: February 7, 2017
    Assignee: General Electric Company
    Inventors: Don Mark Lipkin, Curtis Alan Johnson, Peter Joel Meschter, Sairam Sundaram, Julin Wan
  • Patent number: 9428650
    Abstract: An article includes a silicon-containing region including surface features on a surface thereof. The surface features include depressions, protuberances, or combinations thereof. At least one outer layer overlies the surface of the silicon-containing region. A constituent layer is provided on the surface of the silicon-containing region and between and contacting the silicon-containing region and the at least one outer layer. The constituent layer is formed by constituents of the silicon-containing region and is susceptible to creep within an operating environment of the article. The surface features physically interlock the at least one outer layer with the silicon-containing region through the constituent layer.
    Type: Grant
    Filed: December 11, 2012
    Date of Patent: August 30, 2016
    Assignee: General Electric Company
    Inventors: Peter Joel Meschter, Curtis Alan Johnson, Sairam Sundaram, Julin Wan, Don Mark Lipkin
  • Publication number: 20150118443
    Abstract: An article includes a silicon-containing region; at least one outer layer overlying a surface of the silicon-containing region; and a constituent layer on the surface of the silicon-containing region and between and contacting the silicon-containing region and the at least one outer layer, the constituent layer being formed by constituents of the silicon-containing region and being susceptible to creep within an operating environment of the article, wherein the silicon-containing region defines a plurality of channels and a plurality of ridges that interlock within the plurality of channels are formed in the silicon-containing region to physically interlock the at least one outer layer with the silicon-containing region through the constituent layer.
    Type: Application
    Filed: October 31, 2013
    Publication date: April 30, 2015
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Don Mark Lipkin, Curtis Alan Johnson, Peter Joel Meschter, Sairam Sundaram, Julin Wan
  • Patent number: 8779886
    Abstract: A device, such as a switch structure, is provided. The switch structure can include a contact and a conductive element each respectively disposed on a substrate. The conductive element can be composed substantially of metallic material, and can be configured to be deformable between a first position, in which the conductive element is separated from the contact by a separation distance, and a second position, in which the conductive element contacts the contact and stores mechanical energy. The conductive element can be further configured such that, subsequent to being deformed into the second position at a temperature between about room temperature and about half of a melting temperature of the metallic material for a cumulative time of at least 107 seconds, the separation distance in the absence of external forces varies by less than 20 percent over the cumulative time. Associated methods are also provided.
    Type: Grant
    Filed: November 30, 2009
    Date of Patent: July 15, 2014
    Assignee: General Electric Company
    Inventors: Marco Francesco Aimi, Shubhra Bansal, Christopher Fred Keimel, Kuna Venkat Satya Rama Kishore, Sairam Sundaram, Parag Thakre
  • Publication number: 20140162027
    Abstract: An article includes a silicon-containing region including surface features on a surface thereof. The surface features include depressions, protuberances, or combinations thereof. At least one outer layer overlies the surface of the silicon-containing region. A constituent layer is provided on the surface of the silicon-containing region and between and contacting the silicon-containing region and the at least one outer layer. The constituent layer is formed by constituents of the silicon-containing region and is susceptible to creep within an operating environment of the article. The surface features physically interlock the at least one outer layer with the silicon-containing region through the constituent layer.
    Type: Application
    Filed: December 11, 2012
    Publication date: June 12, 2014
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Peter Joel Meschter, Curtis Alan Johnson, Sairam Sundaram, Julin Wan, Don Mark Lipkin
  • Patent number: 8236232
    Abstract: Methods for making a reinforced refractory crucible for melting titanium alloys including providing a form, applying a facecoat to the form, the facecoat having at least one facecoat layer, applying a backing about the facecoat, the backing having at least one backing layer, applying at least one reinforcing element to at least a portion of the facecoat layer, the backing layer, or a combination thereof where the reinforcing element includes at least one composition selected from ceramic compositions, metallic compositions, and combinations thereof.
    Type: Grant
    Filed: September 28, 2007
    Date of Patent: August 7, 2012
    Assignee: General Electric Company
    Inventors: Bernard Patrick Bewlay, Michael Francis Xavier Gigliotti, Thomas Joseph Kelly, Mohamed Rahmane, Stephen Rutkowski, Michael James Weimer, Sairam Sundaram
  • Patent number: 8062581
    Abstract: Refractory crucibles capable of managing thermal stress and suitable for melting highly reactive alloys having a facecoat, a backing, and at least one retaining ring applied about at least a portion of the backing of the crucible, the retaining ring comprising a composition selected from the group consisting of conductive materials, non-conductive materials, and combinations thereof.
    Type: Grant
    Filed: November 30, 2007
    Date of Patent: November 22, 2011
    Inventors: Bernard Patrick Bewlay, Michael Francis Xavier Gigliotti, Mohamed Rahmane, Thomas Joseph Kelly, Michael James Weimer, Sairam Sundaram
  • Patent number: 8035304
    Abstract: A high intensity discharge lamp, in certain embodiments, includes a uniquely shaped shoulder and dimensions selected to reduce stress and associated cracking. The uniquely shaped shoulder has a variable diameter, such as, e.g., a cup-shaped geometry, a curved funnel-shaped geometry, or a conical-shaped geometry. The selected or optimized dimensions may include a tip-to-neck distance, a tip-to-wall distance, and an internal diameter of the lamp. The selected or optimized dimensions also may include a uniform wall thickness, an arc gap distance, and an electrode thickness. These dimensions and shapes are selected to reduce undesirably high maximum stresses and temperatures in the lamp. As a result, the lamp is able to provide higher performance with a longer life due to a decreased risk of stress cracking during rapid start up and steady state operation.
    Type: Grant
    Filed: March 6, 2008
    Date of Patent: October 11, 2011
    Assignee: General Electric Company
    Inventors: Svetlana Selezneva, Mohamed Rahmane, Sairam Sundaram, Andrey Meshkov, Garry R. Allen, Viktor Varga, Agoston Boroczki
  • Patent number: 8007712
    Abstract: Reinforced crucibles for melting titanium alloys having a facecoat including at least one facecoat layer, a backing including at least one backing layer, and at least one reinforcing element applied to at least a portion of one or more of the facecoat layer, the backing layer, or a combination thereof where the reinforcing element includes at least one composition selected from ceramic compositions, metallic compositions, and combinations thereof.
    Type: Grant
    Filed: September 28, 2007
    Date of Patent: August 30, 2011
    Assignee: General Electric Company
    Inventors: Bernard Patrick Bewlay, Michael Francis Xavier Gigliotti, Thomas Joseph Kelly, Mohamed Rahmane, Stephen Rutkowski, Michael James Weimer, Sairam Sundaram
  • Publication number: 20110128112
    Abstract: A device, such as a switch structure, is provided. The switch structure can include a contact and a conductive element each respectively disposed on a substrate. The conductive element can be composed substantially of metallic material, and can be configured to be deformable between a first position, in which the conductive element is separated from the contact by a separation distance, and a second position, in which the conductive element contacts the contact and stores mechanical energy. The conductive element can be further configured such that, subsequent to being deformed into the second position at a temperature between about room temperature and about half of a melting temperature of the metallic material for a cumulative time of at least 107 seconds, the separation distance in the absence of external forces varies by less than 20 percent over the cumulative time. Associated methods are also provided.
    Type: Application
    Filed: November 30, 2009
    Publication date: June 2, 2011
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Marco Francesco Aimi, Shubhra Bansal, Christopher Fred Keimel, Kuna Venkat Satya Rama Kishore, Sairam Sundaram, Parag Thakre
  • Patent number: 7901110
    Abstract: A gas discharge lamp includes an arc envelope and a cooling device. Cooling passage is provided between the arc envelope and the cooling device. An airflow blocking structure is mounted rotatably to the arc envelope. The airflow blocking structure blocks airflow between the cooling device and the arc envelope except for a portion of the passage directed towards a top side of the arc envelope.
    Type: Grant
    Filed: April 12, 2005
    Date of Patent: March 8, 2011
    Assignee: General Electric Company
    Inventors: Amol Suresh Mulay, Viktor Karoly Varga, Gary Robert Allen, Sairam Sundaram, Svetlana Selezneva, Vijaykumar Mallappa Kannure, Rocco Thomas Giordano
  • Patent number: 7884550
    Abstract: A transparent sintered yttrium aluminum garnet ceramic material formed from a solid-state reaction of a mixture of yttrium oxide powder and aluminum oxide powder during sintering. The ceramic material preferably has an in-line transmission of greater than 75% so it may used to fabricate arc tubes for high intensity discharge lamps used in automotive headlamps.
    Type: Grant
    Filed: November 7, 2006
    Date of Patent: February 8, 2011
    Assignee: General Electric Company
    Inventors: Gregory M. Gratson, James A. Brewer, Venkat S. Venkataramani, Mohamed Rahmane, Svetlana Selezneva, Sairam Sundaram
  • Patent number: 7761969
    Abstract: Methods for making refractory crucibles capable of managing thermal stresses and suitable for melting highly reactive alloys, the method involving providing a crucible having at least a facecoat and a backing, heating at least one retaining ring, applying the at least one retaining ring about at least a portion of the backing of the crucible; and allowing the at least one retaining ring to cool and shrink-fit about the crucible.
    Type: Grant
    Filed: November 30, 2007
    Date of Patent: July 27, 2010
    Assignee: General Electric Company
    Inventors: Bernard Patrick Bewlay, Michael Francis Xavier Gigliotti, Mohamed Rahmane, Thomas Joseph Kelly, Michael James Weimer, Sairam Sundaram
  • Publication number: 20090224674
    Abstract: A high intensity discharge lamp, in certain embodiments, includes a uniquely shaped shoulder and dimensions selected to reduce stress and associated cracking. The uniquely shaped shoulder has a variable diameter, such as, e.g., a cup-shaped geometry, a curved funnel-shaped geometry, or a conical-shaped geometry. The selected or optimized dimensions may include a tip-to-neck distance, a tip-to-wall distance, and an internal diameter of the lamp. The selected or optimized dimensions also may include a uniform wall thickness, an arc gap distance, and an electrode thickness. These dimensions and shapes are selected to reduce undesirably high maximum stresses and temperatures in the lamp. As a result, the lamp is able to provide higher performance with a longer life due to a decreased risk of stress cracking during rapid start up and steady state operation.
    Type: Application
    Filed: March 6, 2008
    Publication date: September 10, 2009
    Applicant: General Electric Company, a New York Corporation
    Inventors: Svetlana Selezneva, Mohamed Rahmane, Sairam Sundaram, Andrey Meshkov, Garry R. Allen, Viktor Varga, Agoston Boroczki
  • Publication number: 20090140473
    Abstract: Refractory crucibles capable of managing thermal stress and suitable for melting highly reactive alloys having a facecoat, a backing, and at least one retaining ring applied about at least a portion of the backing of the crucible, the retaining ring comprising a composition selected from the group consisting of conductive materials, non-conductive materials, and combinations thereof.
    Type: Application
    Filed: November 30, 2007
    Publication date: June 4, 2009
    Inventors: BERNARD PATRICK BEWLAY, Michael Francis Xavier Gigliotti, Mohamed Rahmane, Thomas Joseph Kelly, Michael James Weimer, Sairam Sundaram
  • Publication number: 20090139074
    Abstract: Methods for making refractory crucibles capable of managing thermal stresses and suitable for melting highly reactive alloys, the method involving providing a crucible having at least a facecoat and a backing, heating at least one retaining ring, applying the at least one retaining ring about at least a portion of the backing of the crucible; and allowing the at least one retaining ring to cool and shrink-fit about the crucible.
    Type: Application
    Filed: November 30, 2007
    Publication date: June 4, 2009
    Inventors: Bernard Patrick Bewlay, Michael Francis Xavier Gigliotti, Mohamed Rahmane, Thomas Joseph Kelly, Michael James Weimer, Sairam Sundaram
  • Publication number: 20080290568
    Abstract: Reinforced crucibles for melting titanium alloys having a facecoat including at least one facecoat layer, a backing including at least one backing layer, and at least one reinforcing element applied to at least a portion of one or more of the facecoat layer, the backing layer, or a combination thereof where the reinforcing element includes at least one composition selected from ceramic compositions, metallic compositions, and combinations thereof.
    Type: Application
    Filed: September 28, 2007
    Publication date: November 27, 2008
    Inventors: Bernard Patrick Bewlay, Michael Francis Xavier Gigliotti, Thomas Joseph Kelly, Mohamed Rahmane, Stephen Rutkowski, Michael James Weimer, Sairam Sundaram
  • Publication number: 20080292791
    Abstract: Methods for making a reinforced refractory crucible for melting titanium alloys including providing a form, applying a facecoat to the form, the facecoat having at least one facecoat layer, applying a backing about the facecoat, the backing having at least one backing layer, applying at least one reinforcing element to at least a portion of the facecoat layer, the backing layer, or a combination thereof where the reinforcing element includes at least one composition selected from ceramic compositions, metallic compositions, and combinations thereof.
    Type: Application
    Filed: September 28, 2007
    Publication date: November 27, 2008
    Inventors: Bernard Patrick Bewlay, Michael Francis Xavier Gigliotti, Thomas Joseph Kelly, Mohamed Rahmane, Stephen Rutkowski, Michael James Weimer, Sairam Sundaram
  • Patent number: 7394200
    Abstract: A high intensity discharge lamp, the lamp including a light emitting vessel having a wall made of ceramic material that defines an inner space with a first end portion having a respective first opening formed therein and a second end portion having a respective second opening formed therein, two discharge electrodes, with a first electrode extending therethrough the first opening of the first end portion of the vessel and a second electrode extending therethrough the second opening of the second end portion of the vessel, together forming a gap between ends of the discharge electrodes positioned within the vessel, wherein the light emitting vessel defines an inner space characterized by an inner diameter ranging from and including 1 millimeters to 3 millimeters and an inner length between and including 5 millimeters to 10 millimeters, wherein the wall of the vessel has a thickness ranging between and including 0.3 millimeters to 0.
    Type: Grant
    Filed: November 30, 2005
    Date of Patent: July 1, 2008
    Assignee: General Electric Company
    Inventors: Svetlana Selezneva, Sairam Sundaram, Mohamed Rahmane, Sergiy Zalyubovskiy, Gary R. Allen, Viktor K. Varga
  • Publication number: 20080122362
    Abstract: A transparent sintered yttrium aluminum garnet ceramic material formed from a solid-state reaction of a mixture of yttrium oxide powder and aluminum oxide powder during sintering. The ceramic material preferably has an in-line transmission of greater than 75% so it may used to fabricate arc tubes for high intensity discharge lamps used in automotive headlamps.
    Type: Application
    Filed: November 7, 2006
    Publication date: May 29, 2008
    Inventors: Gregory M. Gratson, James A. Brewer, Venkat S. Venkataramani, Mohamed Rahmane, Svetlana Selezneva, Sairam Sundaram