Patents by Inventor Ravi V. J. Chari

Ravi V. J. Chari 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).

  • Publication number: 20180002440
    Abstract: The invention relates to novel benzodiazepine derivatives with antiproliferative activity and more specifically to novel benzodiazepine compounds of formula (I)-(VII). The invention also provides conjugates of the benzodiazepine compounds linked to a cell-binding agent. The invention further provides compositions and methods useful for inhibiting abnormal cell growth or treating a proliferative disorder in a mammal using the compounds or conjugates of the invention.
    Type: Application
    Filed: July 10, 2017
    Publication date: January 4, 2018
    Inventors: Wei Li, Michael Louis Miller, Nathan Elliott Fishkin, Ravi V.J. Chari
  • Patent number: 9840564
    Abstract: The invention relates to novel benzodiazepine derivatives with antiproliferative activity and more specifically to novel benzodiazepine compounds of formula (I)-(VII). The invention also provides conjugates of the benzodiazepine compounds linked to a cell-binding agent. The invention further provides compositions and methods useful for inhibiting abnormal cell growth or treating a proliferative disorder in a mammal using the compounds or conjugates of the invention.
    Type: Grant
    Filed: July 27, 2016
    Date of Patent: December 12, 2017
    Assignee: IMMUNOGEN, INC.
    Inventors: Wei Li, Michael Louis Miller, Nathan Elliott Fishkin, Ravi V. J. Chari
  • Publication number: 20170340749
    Abstract: The invention relates to novel benzodiazepine derivatives with antiproliferative activity and more specifically to novel benzodiazepine compounds of formula (I)-(VII). The invention also provides conjugates of the benzodiazepine compounds linked to a cell-binding agent. The invention further provides compositions and methods useful for inhibiting abnormal cell growth or treating a proliferative disorder in a mammal using the compounds or conjugates of the invention.
    Type: Application
    Filed: March 31, 2017
    Publication date: November 30, 2017
    Inventors: Ravi V.J. Chari, Michael Louis Miller, Manami Shizuka
  • Publication number: 20170340748
    Abstract: The invention relates to novel benzodiazepine derivatives with antiproliferative activity and more specifically to novel benzodiazepine compounds of formula (I)-(VI). The invention also provides conjugates of the benzodiazepine compounds linked to a cell-binding agent. The invention further provides compositions and methods useful for inhibiting abnormal cell growth or treating a proliferative disorder in a mammal using the compounds or conjugates of the invention.
    Type: Application
    Filed: April 28, 2017
    Publication date: November 30, 2017
    Inventors: Ravi V.J. Chari, Michael Louis Miller, Manami Shizuka
  • Publication number: 20170274091
    Abstract: Conjugates and compounds for making conjugates which are PBD molecules linked via the N10 position are disclosed, along with the use of the conjugates for treating proliferative diseases, including cancer.
    Type: Application
    Filed: January 26, 2017
    Publication date: September 28, 2017
    Inventors: Ravi V.J. Chari, Michael Louis Miller
  • Patent number: 9771432
    Abstract: This invention describes a method of conjugating a cell binding agent such as an antibody with an effector group (e.g., a cytotoxic agent) or a reporter group (e.g., a radionuclide), whereby the reporter or effector group is first reacted with a bifunctional linker and the mixture is then used without purification for the conjugation reaction with the cell binding agent. The method described in this invention is advantageous for preparation of stably-linked conjugates of cell binding agents, such as antibodies with effector or reporter groups. This conjugation method provides in high yields conjugates of high purity and homogeneity that are without inter-chain cross-linking and inactivated linker residues.
    Type: Grant
    Filed: May 27, 2016
    Date of Patent: September 26, 2017
    Assignee: IMMUNOGEN, INC.
    Inventors: Brenda A. Kellogg, Rajeeva Singh, Ravi V. J. Chari
  • Publication number: 20170226220
    Abstract: The present invention discloses a method for targeting maytansinoids to a selected cell population, the method comprising contacting a cell population or tissue suspected of containing the selected cell population with a cell-binding agent maytansinoid conjugate, wherein one or more maytansinoids is covalently linked to the cell-binding agent via a non-cleavable linker and the cell-binding agent binds to cells of the selected cell population.
    Type: Application
    Filed: January 23, 2017
    Publication date: August 10, 2017
    Inventors: Ravi V.J. CHARI, Walter A. BLATTLER
  • Publication number: 20170183419
    Abstract: The invention relates to novel benzodiazepine derivatives with antiproliferative activity and more specifically to novel benzodiazepines of formula (I) and (II), in which the diazepine ring (B) is fused with a heterocyclic ring (CD), wherein the heterocyclic ring is bicyclic or a compound of formula (III), in which the diazepine ring (B) is fused with a heterocyclic ring (C), wherein the heterocyclic ring is monocyclic. The invention provides cytotoxic dimers of these compounds. The invention also provides conjugates of the monomers and the dimers. The invention further provides compositions and methods useful for inhibiting abnormal cell growth or treating a proliferative disorder in a mammal using the compounds or conjugates of the invention. The invention further relates to methods of using the compounds or conjugates for in vitro, in situ, and in vivo diagnosis or treatment of mammalian cells, or associated pathological conditions.
    Type: Application
    Filed: December 7, 2016
    Publication date: June 29, 2017
    Inventors: Wei Li, Nathan Elliott Fishkin, Robert Yongxin Zhao, Michael Louis Miller, Ravi V.J. Chari
  • Publication number: 20170157264
    Abstract: Charged or pro-charged cross-linking moieties and conjugates of cell binding agents and drugs comprising the charged or pro-charged cross-linking moieties and method of making the same.
    Type: Application
    Filed: October 14, 2016
    Publication date: June 8, 2017
    Inventors: Ravi V.J. Chari, Robert Yongxin Zhao, Yelena Kovtun, Rajeeva Singh, Wayne C. Widdison
  • Patent number: 9669102
    Abstract: The invention relates to novel benzodiazepine derivatives with antiproliferative activity and more specifically to novel benzodiazepine compounds of formula (I)-(VI). The invention also provides conjugates of the benzodiazepine compounds linked to a cell-binding agent. The invention further provides compositions and methods useful for inhibiting abnormal cell growth or treating a proliferative disorder in a mammal using the compounds or conjugates of the invention.
    Type: Grant
    Filed: September 2, 2015
    Date of Patent: June 6, 2017
    Assignee: ImmunoGen, Inc.
    Inventors: Ravi V. J. Chari, Michael Louis Miller, Manami Shizuka
  • Publication number: 20170106097
    Abstract: The application concerns methods of treatment using anti-ErbB receptor antibody-maytansinoid conjugates, and articles of manufacture suitable for use in such methods. In particular, the invention concerns ErbB receptor-directed cancer therapies, using anti-ErbB receptor antibody-maytansinoid conjugates.
    Type: Application
    Filed: June 1, 2016
    Publication date: April 20, 2017
    Inventors: Walter BLATTLER, Ravi V.J. Chari, Mark Sliwkowski, Sharon Erickson, Ralph Schwall
  • Patent number: 9617270
    Abstract: The invention relates to novel benzodiazepine derivatives with antiproliferative activity and more specifically to novel benzodiazepine compounds of formula (I)-(VII). The invention also provides conjugates of the benzodiazepine compounds linked to a cell-binding agent. The invention further provides compositions and methods useful for inhibiting abnormal cell growth or treating a proliferative disorder in a mammal using the compounds or conjugates of the invention.
    Type: Grant
    Filed: February 13, 2015
    Date of Patent: April 11, 2017
    Assignee: IMMUNOGEN, INC.
    Inventors: Wei Li, Michael Louis Miller, Ravi V. J. Chari
  • Publication number: 20170044266
    Abstract: The invention relates to novel benzodiazepine derivatives with antiproliferative activity and more specifically to novel benzodiazepine compounds of formula (I)-(VII). The invention also provides conjugates of the benzodiazepine compounds linked to a cell-binding agent. The invention further provides compositions and methods useful for inhibiting abnormal cell growth or treating a proliferative disorder in a mammal using the compounds or conjugates of the invention.
    Type: Application
    Filed: July 27, 2016
    Publication date: February 16, 2017
    Inventors: Wei Li, Michael Louis Miller, Nathan Elliott Fishkin, Ravi V.J. Chari
  • Patent number: 9555125
    Abstract: Conjugates and compounds for making conjugates which are PBD molecules linked via the N10 position are disclosed, along with the use of the conjugates for treating proliferative diseases, including cancer.
    Type: Grant
    Filed: November 20, 2014
    Date of Patent: January 31, 2017
    Assignee: ImmunoGen, Inc.
    Inventors: Ravi V. J. Chari, Michael Louis Miller
  • Patent number: 9550787
    Abstract: The invention relates to novel benzodiazepine derivatives with antiproliferative activity and more specifically to novel benzodiazepines of formula (I) and (II), in which the diazepine ring (B) is fused with a heterocyclic ring (CD), wherein the heterocyclic ring is bicyclic or a compound of formula (III), in which the diazepine ring (B) is fused with a heterocyclic ring (C), wherein the heterocyclic ring is monocyclic. The invention provides cytotoxic dimers of these compounds. The invention also provides conjugates of the monomers and the dimers. The invention further provides compositions and methods useful for inhibiting abnormal cell growth or treating a proliferative disorder in a mammal using the compounds or conjugates of the invention. The invention further relates to methods of using the compounds or conjugates for in vitro, in situ, and in vivo diagnosis or treatment of mammalian cells, or associated pathological conditions.
    Type: Grant
    Filed: January 7, 2016
    Date of Patent: January 24, 2017
    Assignee: ImmunoGen, Inc.
    Inventors: Wei Li, Nathan Elliott Fishkin, Robert Yongxin Zhao, Michael Louis Miller, Ravi V.J. Chari
  • Publication number: 20170002096
    Abstract: This invention describes a method of conjugating a cell binding agent such as an antibody with an effector group (e.g., a cytotoxic agent) or a reporter group (e.g., a radionuclide), whereby the reporter or effector group is first reacted with a bifunctional linker and the mixture is then used without purification for the conjugation reaction with the cell binding agent. The method described in this invention is advantageous for preparation of stably-linked conjugates of cell binding agents, such as antibodies with effector or reporter groups.
    Type: Application
    Filed: May 27, 2016
    Publication date: January 5, 2017
    Inventors: Brenda A. KELLOGG, Rajeeva SINGH, Ravi V. J. CHARI
  • Patent number: 9534000
    Abstract: The invention relates to novel benzodiazepine derivatives with antiproliferative activity and more specifically to novel benzodiazepine compounds, such as those in formulas (V)-(VII). The invention also provides conjugates of the benzodiazepine compounds linked to a cell-binding agent. The invention further provides compositions and methods useful for inhibiting abnormal cell growth or treating a proliferative disorder in a mammal using the compounds or conjugates of the invention. The present invention is further directed to methods of preparing a conjugate of a cell-binding agent and a cytotoxic compound. The methods comprise the use of an imine reactive compound to enable efficient conjugations of cytotoxic compounds with cell binding agents.
    Type: Grant
    Filed: February 15, 2012
    Date of Patent: January 3, 2017
    Assignee: ImmunoGen, Inc.
    Inventor: Ravi V. J. Chari
  • Publication number: 20160367698
    Abstract: The invention relates to novel benzodiazepine derivatives with antiproliferative activity and more specifically to novel benzodiazepine compounds of formula (I)-(VII). The invention also provides conjugates of the benzodiazepine compounds linked to a cell-binding agent. The invention further provides compositions and methods useful for inhibiting abnormal cell growth or treating a proliferative disorder in a mammal using the compounds or conjugates of the invention.
    Type: Application
    Filed: June 1, 2016
    Publication date: December 22, 2016
    Inventors: Ravi V.J. Chari, Michael Louis Miller, Manami Shizuka
  • Patent number: 9498541
    Abstract: Charged or pro-charged cross-linking moieties and conjugates of cell binding agents and drugs comprising the charged or pro-charged cross-linking moieties and method of making the same.
    Type: Grant
    Filed: May 15, 2015
    Date of Patent: November 22, 2016
    Assignee: ImmunoGen, Inc.
    Inventors: Ravi V. J. Chari, Robert Yongxin Zhao, Yelena Kovtun, Rajeeva Singh, Wayne C. Widdison
  • Patent number: 9434748
    Abstract: The invention relates to novel benzodiazepine derivatives with antiproliferative activity and more specifically to novel benzodiazepine compounds of formula (I)-(VII). The invention also provides conjugates of the benzodiazepine compounds linked to a cell-binding agent. The invention further provides compositions and methods useful for inhibiting abnormal cell growth or treating a proliferative disorder in a mammal using the compounds or conjugates of the invention.
    Type: Grant
    Filed: September 9, 2015
    Date of Patent: September 6, 2016
    Assignee: ImmunoGen, Inc.
    Inventors: Wei Li, Michael Louis Miller, Nathan Elliott Fishkin, Ravi V. J. Chari