Patents by Inventor Narasimhachari Narayanan

Narasimhachari Narayanan 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: 7597878
    Abstract: Compounds and methods are disclosed that are useful for noninvasive imaging in the near-infrared (NIR) spectral range. The NIR is highly sensitive for tumor detection and tracking. The application discloses targeting a tumor-enriched cell surface receptor with a ligand-conjugated fluorescent probe, which specifically allows detection of the tumor relative to the negligible animal autofluorescence.
    Type: Grant
    Filed: May 19, 2006
    Date of Patent: October 6, 2009
    Assignee: Li-Cor, Inc.
    Inventors: Joy Kovar, Jiyan Chen, Daniel R. Draney, D. Michael Olive, William M. Volcheck, Xinshe Xu, Ananda G. Lugade, Narasimhachari Narayanan
  • Publication number: 20090130024
    Abstract: This invention relates to new fluorescent chemical entities, especially fluorescent molecules that comprise biocompatible N,N-disubstituted sulfonamide fluorochromes. This invention also relates to the corresponding reactive versions of such molecules. This invention also relates to the corresponding conjugates with moieties such as peptides, proteins, various biomolecules, carbocyclic and heterocyclic compounds, sugars, and their uses thereof.
    Type: Application
    Filed: September 1, 2006
    Publication date: May 21, 2009
    Inventors: Narasimhachari Narayanan, Kevin Groves, Jeffrey D. Peterson, Milind Rajopadhye
  • Patent number: 7504089
    Abstract: A compound of the formula (I) wherein the variables are defined herein. Methods of dye-labeling biomolecules with the compound of formula (I) and dye-labeled biomolecules are also provided.
    Type: Grant
    Filed: November 4, 2005
    Date of Patent: March 17, 2009
    Assignee: Li-Cor, Inc.
    Inventors: Ananda G. Lugade, Narasimhachari Narayanan, Daniel R. Draney
  • Publication number: 20060280688
    Abstract: Compounds and methods are disclosed that are useful for noninvasive imaging in the near-infrared (NIR) spectral range. The NIR is highly sensitive for tumor detection and tracking. The application discloses targeting a tumor-enriched cell surface receptor with a ligand-conjugated fluorescent probe, which specifically allows detection of the tumor relative to the negligible animal autofluorescence.
    Type: Application
    Filed: May 19, 2006
    Publication date: December 14, 2006
    Applicant: LI-COR, Inc.
    Inventors: Joy Kovar, Jiyan Chen, Daniel Draney, D. Olive, William Volcheck, Xinshe Xu, Ananda Lugade, Narasimhachari Narayanan
  • Publication number: 20060063247
    Abstract: A compound of the formula (I) wherein Z is O, S, or NR35 wherein R35 is H or alkyl; R1-R5 are each independently H, alkyl, halo, carboxyl, amino, or SO3?Cat+, wherein Cat+ is a cation and at least one of R1-R5 is SO3?Cat+; R6 and R7 are each H, alkyl, or optionally, together with the (a) group to which they are bonded, form a ring; m and n are each independently integers from 0 to 5; X and Y are each independently O, S, Se or CR19R20, wherein R19 and R20 are each independently alkyl, or optionally form a ring together with the carbon atom to which they are bonded; R8 and R13 are each independently alkyl, (CH2)rR25 or (CH2)rR18; wherein at least one of R8 and R13 (CH2)rR18 and wherein r is an integer from 1 to 50, and R25 is a functional group that does not directly react with a carboxyl, hydroxyl, amino, or a thiol group, and R18 is a functional group that can react with a carboxyl, hydroxyl, amino, or thiol group; and R9-R12 and R14-R17 are each independently H, alkyl, halo, amino, sulfonato, R21 COOH,
    Type: Application
    Filed: November 4, 2005
    Publication date: March 23, 2006
    Applicant: LI-COR, Inc.
    Inventors: Ananda Lugade, Narasimhachari Narayanan, Daniel Draney
  • Patent number: 6995274
    Abstract: A compound of the formula (I) wherein Z is O, S, or NR35 wherein R35 is H or alkyl; R1–R5 are each independently H, alkyl, halo, carboxyl, amino, or SO3?Cat+, wherein Cat+ is a cation and at least one of R1–R5 is SO3?Cat+; R6 and R7 are each H, alkyl, or optionally, together with the (a) group to which they are bonded, form a ring; m and n are each independently integers from 0 to 5; X and Y are each independently O, S, Se or CR19R20, wherein R19 and R20 are each independently alkyl, or optionally form a ring together with the carbon atom to which they are bonded; R8 and R13 are each independently alkyl, (CH2)rR25 or (CH2)rR18; wherein at least one of R8 and R13 (CH2)rR18 and wherein r is an integer from 1 to 50, and R25 is a functional group that does not directly react with a carboxyl, hydroxyl, amino, or a thiol group, and R18 is a functional group that can react with a carboxyl, hydroxyl, amino, or thiol group; and R9–R12 and R14–R17 are each independently H, alkyl, halo, amino, sulfonato, R21 COOH, R
    Type: Grant
    Filed: January 28, 2003
    Date of Patent: February 7, 2006
    Assignee: Li-Cor, Inc.
    Inventors: Ananda G. Lugade, Narasimhachari Narayanan, Daniel R. Draney
  • Publication number: 20040014981
    Abstract: A compound of the formula (I) is provided: (I), wherein Z is O, S, or NR35 wherein R35 is H or alkyl; R1-R5 are each independently H, alkyl, halo, carboxyl, amino, or SO331 Cat+, wherein Cat+ is a cation and at least one of R1-R5 is SO3−Cat+; R6 and R7 are each H, alkyl, or optionally, together with the (a) group to which they are bonded, form a ring; m and n are each independently integers from 0 to 5; X and Y are each independently O, S, Se or CR19R20, wherein R19 and R20 are each independently alkyl, or optionally form a ring together with the carbon atom to which they are bonded; R8 and R13 are each independently alkyl, (CH2)rR25 or (CH2)rR18; wherein at least one of R8 and R13 (CH2)rR18 and wherein r is an integer from 1 to 50, and R25 is a functional group that does not directly react with a carboxyl, hydroxyl, amino or a thiol group, and R18 is a functional group that can react with 1
    Type: Application
    Filed: January 28, 2003
    Publication date: January 22, 2004
    Inventors: Ananda G. Lugade, Narasimhachari Narayanan, Daniel R. Draney
  • Patent number: 6593148
    Abstract: A novel cyanine dye having the formula is useful for labeling biological and nonbiological molecules.
    Type: Grant
    Filed: March 7, 2000
    Date of Patent: July 15, 2003
    Assignee: Li-Cor, Inc.
    Inventor: Narasimhachari Narayanan
  • Patent number: 6086737
    Abstract: To sequence DNA automatically, DNA marked with far infrared, near infrared, or infrared fluorescent dyes are electrophoresed in a plurality of channels through a gel electrophoresis slab or capillary tubes wherein the DNA samples are resolved in accordance with the size of DNA fragments in the gel electrophoresis slab or capillary tubes into fluorescently marked DNA bands. The separated samples are scanned photoelectrically with a laser diode and a sensor, wherein the laser scans with scanning light at a wavelength within the absorbance spectrum of said fluorescently marked DNA samples and light is sensed at the emission wavelength of the marked DNA.
    Type: Grant
    Filed: July 11, 1995
    Date of Patent: July 11, 2000
    Assignee: Li-Cor, Inc.
    Inventors: Gabor Patonay, Narasimhachari Narayanan, John A. Brumbaugh, Lyle Richard Middendorf
  • Patent number: 6027709
    Abstract: New fluorescent cyanine dyes are useful as reporter groups for labeling biomolecules.
    Type: Grant
    Filed: January 10, 1997
    Date of Patent: February 22, 2000
    Assignee: Li-Cor Inc.
    Inventors: Garrick Murray Little, Ramesh Raghavachari, Narasimhachari Narayanan, Harry Leonard Osterman
  • Patent number: 5800995
    Abstract: To sequence DNA automatically, DNA marked with far infrared, near infrared, or infrared fluorescent dyes are electrophoresed in a plurality of channels through a gel electrophoresis slab or capillary tubes wherein the DNA samples are resolved in accordance with the size of DNA fragments in the gel electrophoresis slab or capillary tubes into fluorescently marked DNA bands. The separated samples are scanned photoelectrically with a laser diode and a sensor, wherein the laser scans with scanning light at a wavelength within the absorbance spectrum of said fluorescently marked DNA samples and light is sensed at the emission wavelength of the marked DNA.
    Type: Grant
    Filed: August 30, 1996
    Date of Patent: September 1, 1998
    Assignee: Li-Cor, Inc.
    Inventors: Gabor Patonay, Narasimhachari Narayanan, Lucjan Strekowski, Lyle Richard Middendorf, Malgorzata Lipowska
  • Patent number: 5571388
    Abstract: To sequence DNA automatically, DNA marked with far infrared, near infrared, or infrared fluorescent dyes are electrophoresed in a plurality of channels through a gel electrophoresis slab or capillary tubes wherein the DNA samples are resolved in accordance with the size of DNA fragments in the gel electrophoresis slab or capillary tubes into fluorescently marked DNA bands. The separated samples are scanned photoelectrically with a laser diode and a sensor, wherein the laser scans with scanning light at a wavelength within the absorbance spectrum of said fluorescently marked DNA samples and light is sensed at the emission wavelength of the marked DNA.
    Type: Grant
    Filed: March 1, 1994
    Date of Patent: November 5, 1996
    Assignee: Li-Cor, Inc.
    Inventors: Gabor Patonay, Narasimhachari Narayanan, Lucjan Strekowski, Lyle R. Middendorf, Malgorzata Lipowska