Patents by Inventor Venkatraman Sivaramakrishan

Venkatraman Sivaramakrishan 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: 7274045
    Abstract: 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 C
    Type: Grant
    Filed: March 17, 2005
    Date of Patent: September 25, 2007
    Assignee: Lumination LLC
    Inventors: Ramachandran Gopi Chandran, Madras Venugopal Shankar, Venkatraman Sivaramakrishan, Hari Nadathur Seshadri
  • Publication number: 20060208270
    Abstract: 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+yM?x?y(Al,Ga)2?y(Si,Ge)yB2O7?x?yNzXy: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+ySiy?y?B2O7?z?yNzXy: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+xM?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 Cl, and 0?y??
    Type: Application
    Filed: March 17, 2005
    Publication date: September 21, 2006
    Inventors: Ramachandran Chandran, Madras Shankar, Venkatraman Sivaramakrishan, Hari Seshadri
  • Publication number: 20060049414
    Abstract: Disclosed are oxynitride and oxide phosphor compositions having various formulations. Also disclosed are phosphor blends of the above phosphors and one or more additional phosphors and light emitting devices incorporating the same. The phosphors and their blends can be used in saturated color light sources (e.g. traffic signals), as well as white light sources for general illumination purposes.
    Type: Application
    Filed: August 19, 2005
    Publication date: March 9, 2006
    Inventors: Ramachandran Chandran, Dan Hancu, Nadagouda Mallikarjuna, Emil Radkov, Anant Setlur, Venkatraman Sivaramakrishan, Alok Srivastava, Madras Shankar