Patents by Inventor Ramesh Ramakrishnan

Ramesh Ramakrishnan 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: 8450063
    Abstract: The present invention provides for determining relative copy number difference for one or more target nucleic acid sequences between a test sample and a reference sample or reference value derived therefrom. The methods facilitate the detection of copy number differences less than 1.5-fold.
    Type: Grant
    Filed: January 27, 2010
    Date of Patent: May 28, 2013
    Assignee: Fluidigm Corporation
    Inventors: Simant Dube, Alain Mir, Ramesh Ramakrishnan, Lesley Suzanne Weaver, Bernhard G. Zimmermann
  • Patent number: 8450065
    Abstract: The present invention methods and systems for determining copy number variation of a target polynucleotide in a genome of a subject including amplification based techniques. Methods can include pre-amplification of the sample followed by distribution of sample and a plurality of reaction volumes, quantitative detection of a target polynucleotide and a reference polynucleotide, and analysis so as to determine the relative copy number of the target polynucleotide sequence in the genome of the subject.
    Type: Grant
    Filed: November 30, 2011
    Date of Patent: May 28, 2013
    Assignee: Fluidigm Corporation
    Inventor: Ramesh Ramakrishnan
  • Publication number: 20120282604
    Abstract: The present invention methods and systems for determining copy number variation of a target polynucleotide in a genome of a subject including amplification based techniques. Methods can include pre-amplification of the sample followed by distribution of sample and a plurality of reaction volumes, quantitative detection of a target polynucleotide and a reference polynucleotide, and analysis so as to determine the relative copy number of the target polynucleotide sequence in the genome of the subject.
    Type: Application
    Filed: November 30, 2011
    Publication date: November 8, 2012
    Applicant: Fluidigm Corporation
    Inventor: Ramesh Ramakrishnan
  • Patent number: 8148078
    Abstract: The present invention methods and systems for determining copy number variation of a target polynucleotide in a genome of a subject including amplification based techniques. Methods can include pre-amplification of the sample followed by distribution of sample and a plurality of reaction volumes, quantitative detection of a target polynucleotide and a reference polynucleotide, and analysis so as to determine the relative copy number of the target polynucleotide sequence in the genome of the subject.
    Type: Grant
    Filed: September 8, 2008
    Date of Patent: April 3, 2012
    Assignee: Fluidigm Corporation
    Inventor: Ramesh Ramakrishnan
  • Publication number: 20100203538
    Abstract: The present invention provides for determining relative copy number difference for one or more target nucleic acid sequences between a test sample and a reference sample or reference value derived therefrom. The methods facilitate the detection of copy number differences less than 1.5-fold.
    Type: Application
    Filed: January 27, 2010
    Publication date: August 12, 2010
    Applicant: FLUIDIGM CORPORATION
    Inventors: Simant Dube, Alain Mir, Ramesh Ramakrishnan, Lesley Suzanne Weaver, Bernhard G. Zimmermann
  • Publication number: 20100120038
    Abstract: The present invention provides assay methods that increase the number of samples and/or target nucleic acids that can be analyzed in a single assay.
    Type: Application
    Filed: August 26, 2009
    Publication date: May 13, 2010
    Inventors: Alain Mir, Ramesh Ramakrishnan, Marc Unger, Bernhard G. Zimmermann
  • Publication number: 20090239308
    Abstract: A method of estimating a concentration of DNA molecules in a biological sample includes storing a number of a plurality of reaction sites in a memory and distributing the biological sample among the plurality of reaction sites. The method also includes determining a number of the plurality of reaction sites characterized by a presence of one or more of the DNA molecules and computing a portion of the plurality of reaction sites characterized by the presence of the one or more of the DNA molecules. The method further includes estimating the concentration of the DNA molecules as a function of the portion of the plurality of reaction sites and computing a confidence interval for the estimated concentration of DNA molecules.
    Type: Application
    Filed: July 9, 2008
    Publication date: September 24, 2009
    Applicant: Fluidigm Corporation
    Inventors: Simant Dube, Jian Qin, Ramesh Ramakrishnan
  • Publication number: 20090069194
    Abstract: The present invention methods and systems for determining copy number variation of a target polynucleotide in a genome of a subject including amplification based techniques. Methods can include pre-amplification of the sample followed by distribution of sample and a plurality of reaction volumes, quantitative detection of a target polynucleotide and a reference polynucleotide, and analysis so as to determine the relative copy number of the target polynucleotide sequence in the genome of the subject.
    Type: Application
    Filed: September 8, 2008
    Publication date: March 12, 2009
    Applicant: Fluidigm Corporation
    Inventor: Ramesh Ramakrishnan
  • Publication number: 20080129736
    Abstract: A method of adjusting amplification curves in a PCR experiment includes receiving a plurality of amplification curves for a sample and computing a first parameter for each of the plurality of amplification curves. The method also includes computing a second parameter for each of the plurality of amplification curves and computing a third parameter using at least a portion of the first or second parameters. The method further includes computing an offset for each of the plurality of amplification curves. The offset is a function of the first parameter and the third parameter. Moreover, the method includes adjusting at least one of the plurality of amplification curves by subtracting the offset.
    Type: Application
    Filed: November 30, 2007
    Publication date: June 5, 2008
    Applicant: Fluidigm Corporation
    Inventors: Gang Sun, Ramesh Ramakrishnan, Robert C. Jones
  • Publication number: 20060057613
    Abstract: The present invention provides isolated oligonucleotides and methods for detecting a methicillin resistant Staphylococcus aureus in a sample, including a sample that comprises nucleic acid molecules of higher biological complexity than that of amplified nucleic acid molecules.
    Type: Application
    Filed: July 26, 2005
    Publication date: March 16, 2006
    Inventors: Ramesh Ramakrishnan, Peter Riccelli
  • Patent number: 6986992
    Abstract: This invention relates to methods and compositions for determining single nucleotide polymorphisms (SNPs) in P450 genes. In preferred embodiments, self extension of interrogation probes is prevented by using novel non self-extension probes and/or methods, thereby improving the specificity and efficiency of P450 SNP detection in target samples with minimal false positive results. The invention thus describes a variety of methods to decrease self-extension of interrogation probes. In addition, this invention provides a unique collection of P450 SNP probes on one assay, primer sequences for specific amplification of each of the seven P450 genes and amplicon control probes to evaluate whether the intended p450 gene targets were amplified successfully. The invention also describes a variety of array platforms for performing the assays of the invention; for example: CodeLinkā„¢, eSensorā„¢, multiplex arrays with cartridges etc., all described herein.
    Type: Grant
    Filed: April 1, 2002
    Date of Patent: January 17, 2006
    Assignee: Amersham Biosciences AB
    Inventors: Buena Chui, Robert Elghanian, Vineet Gupta, Krishnamurthy Jayaraman, Gretchen Kiser, Changming Li, Chang-Gong Liu, Kenneth R. Luehrsen, Abhijit Mazumder, Ramesh Ramakrishnan, Arkadiy Silbergleyt, Todd Tuggle, Carl Yamashiro, Handy Yowanto, Ekaterina Pestova, David R. Fermin, David G. Wang, Zhijie John Gu
  • Publication number: 20040229222
    Abstract: This invention relates to methods and compositions for determining single nucleotide polymorphisms (SNPs) in P450 genes. In preferred embodiments, self extension of interrogation probes is prevented by using novel non self-extension probes and/or methods, thereby improving the specificity and efficiency of P450 SNP detection in target samples with minimal false positive results. The invention thus describes a variety of methods to decrease self-extension of interrogation probes. In addition, this invention provides a unique collection of P450 SNP probes on one assay, primer sequences for specific amplification of each of the seven P450 genes and amplicon control probes to evaluate whether the intended p450 gene targets were amplified successfully. The invention also describes a variety of array platforms for performing the assays of the invention; for example: CodeLink™, eSensor™, multiplex arrays with cartridges etc., all described herein.
    Type: Application
    Filed: April 1, 2002
    Publication date: November 18, 2004
    Inventors: Buena Chui, Robert Elghanian, Vineet Gupta, Krishnamurthy Jayaraman, Gretchen Kiser, Changming Li, Chang-Gong Liu, Kenneth R. Luehrsen, Abhijit Mazumder, Ramesh Ramakrishnan, Arkadiy Silbergleyt, Todd Tuggle, Carl Yamashiro, Handy Yowanto, Ekaterina Pestova, David R. Fermin, David G. Wang, Zhijie John Gu
  • Patent number: 6107944
    Abstract: The invention provides a method and system for providing route guidance and other information from a base unit to a remote unit in response to a request from the remote unit. A query is formatted at the remote unit, the query including the request, and is transmitted from the remote unit to the base unit. Requested route guidance information is calculated at the base unit in response to the query, using a large up-to-date database located at the base unit. A response to the query is formatted at the base unit, the response including route guidance information. The response is then transmitted from the base unit to the remote unit for display. The transmission is made in a compact form through the use of maneuver arms and combined maneuver arms and through the use of tokenized forms. A maneuver arm represents a road at an intersection, for depiction on a display, by one or two endpoint coordinates.
    Type: Grant
    Filed: September 10, 1998
    Date of Patent: August 22, 2000
    Assignee: Navigation Technologies Corporation
    Inventors: David A. Behr, Ramesh Ramakrishnan
  • Patent number: 5808566
    Abstract: The invention provides a method and system for providing route guidance and other information from a base unit to a remote unit in response to a request from the remote unit. A query is formatted at the remote unit, the query including the request, and is transmitted from the remote unit to the base unit. Requested route guidance information is calculated at the base unit in response to the query, using a large up-to-date database located at the base unit. A response to the query is formatted at the base unit, the response including route guidance information. The response is then transmitted from the base unit to the remote unit for display. The transmission is made in a compact form through the use of maneuver arms and combined maneuver arms and through the use of tokenized forms. A maneuver arm represents a road at an intersection, for depiction on a display, by one or two endpoint coordinates.
    Type: Grant
    Filed: June 23, 1995
    Date of Patent: September 15, 1998
    Assignee: Navigation Technologies Corporation
    Inventors: David A. Behr, Ramesh Ramakrishnan