Patents by Inventor Ramachandran Gopi Chandran
Ramachandran Gopi Chandran 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: 8329060Abstract: Embodiments of the present techniques provide a related family of phosphors that may be used in lighting systems to generate blue or blue-green light. The phosphors include systems having a general formula of: ((Sr1?zMz)1?(x+w)AwCex)3(Al1?ySiy)O4+y+3(x?w)F1?y?3(x?w) (I), wherein 0<x?0.10, 0?y?0.5, 0?z?0.5, 0?w?x, A is Li, Na, K, Rb, or Ag or any combinations thereof, and M is Ca, Ba, Mg, Zn, or Sn or any combinations thereof. Advantageously, phosphors made accordingly to these formulations maintain emission intensity across a wide range of temperatures. The phosphors may be used in lighting systems, such as LEDs and fluorescent tubes, among others, to produce blue and blue/green light. Further, the phosphors may be used in blends with other phosphors, or in combined lighting systems, to produce white light suitable for illumination.Type: GrantFiled: October 22, 2008Date of Patent: December 11, 2012Assignee: General Electric CompanyInventors: Anant Achyut Setlur, Ramachandran Gopi Chandran, Claire Susan Henderson, Pransanth Kumar Nammalwar, Emil Radkov
-
Patent number: 7857994Abstract: Phosphor compositions, blends thereof and light emitting devices including white light emitting LED based devices, and backlights, based on such phosphor compositions. The devices include a light source and a phosphor material as described. Also disclosed are phosphor blends including such a phosphor and devices made therefrom.Type: GrantFiled: May 30, 2007Date of Patent: December 28, 2010Assignee: GE Lighting Solutions, LLCInventors: Anant Achyut Setlur, Oltea Puica Siclovan, Prasanth Kumar Nammalwar, Ramesh Rao Sathyanarayan, Digamber G. Porob, Ramachandran Gopi Chandran, William Jordan Heward, Emil Vergilov Radkov, Linda Jane Valyou Briel
-
Publication number: 20100096974Abstract: Embodiments of the present techniques provide a related family of phosphors that may be used in lighting systems to generate blue or blue-green light. The phosphors include systems having a general formula of: ((Sr1?zMz)1?(x+w)AwCex)3(Al1?ySiy)O4+y+3(x?w)F1?y?3(x?w) (I), wherein 0<x?0.10, 0?y?0.5, 0?z?0.5, 0?w?x, A is Li, Na, K, Rb, or Ag or any combinations thereof, and M is Ca, Ba, Mg, Zn, or Sn or any combinations thereof. Advantageously, phosphors made accordingly to these formulations maintain emission intensity across a wide range of temperatures. The phosphors may be used in lighting systems, such as LEDs and fluorescent tubes, among others, to produce blue and blue/green light. Further, the phosphors may be used in blends with other phosphors, or in combined lighting systems, to produce white light suitable for illumination.Type: ApplicationFiled: October 22, 2008Publication date: April 22, 2010Applicant: General Electric CompanyInventors: Anant Achyut Setlur, Ramachandran Gopi Chandran, Claire Susan Henderson, Pransanth Kumar Nammalwar, Emil Radkov
-
Publication number: 20080296596Abstract: Phosphor compositions, blends thereof and light emitting devices including white light emitting LED based devices, and backlights, based on such phosphor compositions. The devices include a light source and a phosphor material as described. Also disclosed are phosphor blends including such a phosphor and devices made therefrom.Type: ApplicationFiled: May 30, 2007Publication date: December 4, 2008Inventors: Anant Achyut Setlur, Oltea Puica Siclovan, Prasanth Kumar Nammalwar, Ramesh Rao Sathyanarayan, Digamber G. Porob, Ramachandran Gopi Chandran, William Jordan Heward, Emil Vergilov Radkov, Linda Jane Valyou Briel
-
Publication number: 20080141938Abstract: A processing apparatus for use in a corrosive operating environment is provided. The apparatus includes a base substrate for placing a wafer thereon. The base substrate has a coefficient of thermal expansion. At least one electrode is embedded in or disposed on or under the base substrate. The electrode has a coefficient of thermal expansion in a range of from about 0.70 to about 1.25 times that of the base substrate coefficient of thermal expansion (CTE). At least one coating layer is disposed on the base substrate. The coating layer includes a composition capable of forming a calcium aluminate coating. The calcium aluminate coating layer is doped with one of MgO, CaO, CaF2 and mixtures thereof to control the CTE of the coating layer to match the CTE of the base substrate. The apparatus is exposed to a corrosive operating environment at a temperature range of from about 25 degrees Celsius to about 1500 degrees Celsius. A coated article and associated method are provided.Type: ApplicationFiled: December 13, 2006Publication date: June 19, 2008Applicant: General Electric CompanyInventors: Ramachandran Gopi Chandran, George Theodore Dalakos, Dalong Zhong
-
Publication number: 20070221132Abstract: A processing apparatus for use in a corrosive operating environment at a temperature range of 25-1500° C. is provided. The apparatus has an NZP or an NZP-type coating, which comprises a first composition, a second composition, and a metal cation. The first composition and the second composition form a crystalline structure with three-dimensional network of octahedra and tetrahedra linked by one or more shared atoms. The first composition comprises one or more of Zr, V, Ta, Nb, Hf, Ti, Al, Cr, or a metal of the Lanthanide series. The second composition comprises at least one of phosphorus, silicon, boron, vanadium or aluminum. The one or more shared atoms comprise at least one of oxygen, nitrogen, or carbon. The first composition and the second composition are related as shown by the formula (first composition)2 (second composition)x (shared atom)12-x. The metal cation is disposed within an interstitial site defined by the crystalline structure.Type: ApplicationFiled: November 27, 2006Publication date: September 27, 2007Applicant: General Electric CompanyInventors: Ramachandran Gopi Chandran, Balasubramaniam Vaidhyanathan, Venkat Subramaniam Venkataramani, Victor Lienkong Lou, George Theodore Dalakos, Sheela Kollali Ramasesha
-
Publication number: 20070224451Abstract: A composition is provided that is capable of forming an NZP or an NZP-type coating. The composition includes a first composition, a second composition, and a metal cation. The first composition and the second composition form a crystalline structure with three-dimensional network of octahedra and tetrahedra linked by one or more shared atoms. The first composition comprises one or more of Zr, V, Ta, Nb, Hf, Ti, Al, Cr, or a metal of the Lanthanide series. The second composition comprises at least one of phosphorus, silicon, boron, vanadium or aluminum. The one or more shared atoms comprise at least one of oxygen, nitrogen, or carbon. The first composition and the second composition are related as shown by the formula (first composition)2 (second composition)x (shared atom)12?x. The metal cation is disposed within an interstitial site defined by the crystalline structure.Type: ApplicationFiled: August 11, 2006Publication date: September 27, 2007Applicant: General Electric CompanyInventors: Ramachandran Gopi Chandran, Balasubramaniam Vaidhyanathan, Venkat Subramaniam Venkataramani, Victor Lienkong Lou, George Theodore Dalakos, Sheela Kollali Ramasesha
-
Patent number: 7274045Abstract: Boron containing phosphor compositions having the formulas (1) M3Ln2(BO3)4 doped with at least one activator selected from the group of Eu2+, Mn2+, Pb2+, Ce3+, Eu3+, Tb3+, and Bi3+ where M is at least one of Mg, Ca, Sr, Ba, or Zn, and Ln is at least one of Sc, Y, La, Gd, or Lu; (2) M2?xM?x(Al, Ga)2?y(Si, Ge)yB2O7?zNz:Eu2+, Mn2+, Pb2+ where M? is one or more of alkali metals Na and/or K, M? is one or more of alkaline earth Mg, Ca, Sr, Ba or Zn, 0?x?2, 0?y?2, 0?z?4; and z=x+y; (3) M?2?x+y?M?x?y?(Al, Ga)2?y(Si, Ge)yB2O7?z?y?NzXy:Eu2+, Mn2+, Pb2+, where M? is one or more of alkali metals Na and/or K, M? is one or more of alkaline earth metals Mg, Ca, Sr, Ba and/or Zn, 0?x?2, 0?y?2, 0?z?4; z=x+y, X?F and/or Cl, and 0?y??2; (4) M?2?xM?xAl2?y+y?Siy?y?B2O7?z?y?NzXy:Eu2+, Mn2+, Pb2+, where M? and M? are defined above, 0?x?2, 0?y?2, 0?z?4; z=x+y, X?F and/or Cl, and 0?y??2; (5) M?2?x+x?M?x?x?Al2?y+y?Siy?y?B2O7?z?x??y?NzX(x?+y?):Eu2+, Mn2+, Pb2+, where M? and M? are defined above, 0?x?2, 0?y?2, 0?z?4; z=x+y, X?F and/or CType: GrantFiled: March 17, 2005Date of Patent: September 25, 2007Assignee: Lumination LLCInventors: Ramachandran Gopi Chandran, Madras Venugopal Shankar, Venkatraman Sivaramakrishan, Hari Nadathur Seshadri