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).

  • Patent number: 11793885
    Abstract: The invention relates to novel benzodiazepine derivatives with antiproliferative activity and more specifically to novel benzodiazepine compounds of formulae (I), (II) and (III). 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: December 27, 2018
    Date of Patent: October 24, 2023
    Assignee: IMMUNOGEN, INC.
    Inventors: Michael Louis Miller, Manami Shizuka, Ravi V. J. Chari
  • Patent number: 11732038
    Abstract: The invention relates to novel cell-binding agent-cytotoxic agent conjugates, wherein the cell-binding agent (CBA) is covalently linked to the cytotoxic agent through an aldehyde group obtained from oxidation of a 2-hydroxyethylamine moiety on the CBA. The invention also provides methods of preparing the conjugates of the present invention. The invention further provides composition and methods useful for inhibiting abnormal cell growth or treating a proliferative disorder in a mammal using the conjugates of the invention.
    Type: Grant
    Filed: February 12, 2021
    Date of Patent: August 22, 2023
    Assignee: IMMUNOGEN, INC.
    Inventors: Nathan Elliott Fishkin, Daniel J. Tavares, Lingyun Rui, Luke B. Harris, Manami Shizuka, Michael Louis Miller, Ravi V. J. Chari
  • Publication number: 20230233697
    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: October 25, 2022
    Publication date: July 27, 2023
    Inventors: Ravi V.J. Chari, Michael Louis Miller, Manami Shizuka
  • Publication number: 20230094471
    Abstract: The invention relates to benzodiazepine derivatives with antiproliferative activity and more specifically to benzodiazepine compounds of formulae (I), (II), (TI) and (T2). The invention also provides conjugates of the benzodiazepine compounds linked to a cell-binding agent. The invention further provides compositions and methods 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 27, 2020
    Publication date: March 30, 2023
    Applicant: IMMUNOGEN, INC.
    Inventors: Ravi V.J. Chari, Michael Louis Miller, Manami Shizuka, Katie Elizabeth Archer, Emily Elizabeth Reid
  • Patent number: 11505617
    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, 2021
    Date of Patent: November 22, 2022
    Assignee: IMMUNOGEN, INC.
    Inventors: Wei Li, Nathan Elliott Fishkin, Robert Yongxin Zhao, Michael Louis Miller, Ravi V. J. Chari
  • Publication number: 20220133711
    Abstract: Disclosed herein are novel cytotoxic compounds, and cytotoxic conjugates comprising these cytotoxic compounds and cell-binding agents. More specifically, this disclosure relates to novel camptothecin derivatives thereof, intermediates thereof, conjugates thereof, and pharmaceutically acceptable salts thereof, which are useful as medicaments, in particular as anti-proliferative agents (anticancer agents).
    Type: Application
    Filed: October 15, 2021
    Publication date: May 5, 2022
    Inventors: Ravi V.J. Chari, Wayne C. Widdison, Wei Li, David P. Pleynet
  • Patent number: 11229639
    Abstract: Disclosed herein are novel cytotoxic compounds, and cytotoxic conjugates comprising these cytotoxic compounds and cell-binding agents. More specifically, this disclosure relates to novel camptothecin derivatives thereof, intermediates thereof, conjugates thereof, and pharmaceutically acceptable salts thereof, which are useful as medicaments, in particular as anti-proliferative agents (anticancer agents).
    Type: Grant
    Filed: September 25, 2020
    Date of Patent: January 25, 2022
    Assignee: IMMUNOGEN, INC.
    Inventors: Ravi V. J. Chari, Wayne C. Widdison, Wei Li, David P. Pleynet
  • Publication number: 20210299271
    Abstract: The invention relates to novel cell-binding agent-cytotoxic agent conjugates, wherein the cell-binding agent (CBA) is covalently linked to the cytotoxic agent through an aldehyde group obtained from oxidation of a 2-hydroxyethylamine moiety on the CBA. The invention also provides methods of preparing the conjugates of the present invention. The invention further provides composition and methods useful for inhibiting abnormal cell growth or treating a proliferative disorder in a mammal using the conjugates of the invention.
    Type: Application
    Filed: February 12, 2021
    Publication date: September 30, 2021
    Inventors: Nathan Elliott Fishkin, Daniel J. Tavares, Lingyun Rui, Luke B. Harris, Manami Shizuka, Michael Louis Miller, Ravi V.J. Chari
  • Patent number: 11116845
    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: June 15, 2020
    Date of Patent: September 14, 2021
    Assignee: IMMUNOGEN, INC.
    Inventors: Ravi V. J. Chari, Michael Louis Miller, Manami Shizuka
  • Publication number: 20210261683
    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: October 7, 2020
    Publication date: August 26, 2021
    Inventors: Ravi V.J. CHARI, Walter A. BLATTLER
  • Publication number: 20210238301
    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: January 7, 2021
    Publication date: August 5, 2021
    Inventors: Wei Li, Nathan Elliott Fishkin, Robert Yongxin Zhao, Michael Louis Miller, Ravi V.J. Chari
  • Patent number: 11046762
    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: October 14, 2019
    Date of Patent: June 29, 2021
    Assignee: IMMUNOGEN, INC.
    Inventors: Ravi V. J. Chari, Robert Yongxin Zhao, Yelena Kovtun, Rajeeva Singh, Wayne C. Widdison
  • Patent number: 10988531
    Abstract: The invention relates to novel cell-binding agent-cytotoxic agent conjugates, wherein the cell-binding agent (CBA) is covalently linked to the cytotoxic agent through an aldehyde group obtained from oxidation of a 2-hydroxyethylamine moiety on the CBA. The invention also provides methods of preparing the conjugates of the present invention. The invention further provides composition and methods useful for inhibiting abnormal cell growth or treating a proliferative disorder in a mammal using the conjugates of the invention.
    Type: Grant
    Filed: September 2, 2015
    Date of Patent: April 27, 2021
    Assignee: IMMUNOGEN, INC.
    Inventors: Nathan Elliott Fishkin, Daniel Tavares, Lingyun Rui, Luke B. Harris, Manami Shizuka, Michael Louis Miller, Ravi V. J. Chari
  • Publication number: 20210077482
    Abstract: Disclosed herein are novel cytotoxic compounds, and cytotoxic conjugates comprising these cytotoxic compounds and cell-binding agents. More specifically, this disclosure relates to novel camptothecin derivatives thereof, intermediates thereof, conjugates thereof, and pharmaceutically acceptable salts thereof, which are useful as medicaments, in particular as anti-proliferative agents (anticancer agents).
    Type: Application
    Filed: September 25, 2020
    Publication date: March 18, 2021
    Inventors: Ravi V.J. Chari, Wayne C. Widdison, Wei Li, David P. Pleynet
  • Patent number: 10947315
    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: December 21, 2018
    Date of Patent: March 16, 2021
    Assignee: IMMUNOGEN, INC.
    Inventors: Wei Li, Nathan Elliott Fishkin, Robert Yongxin Zhao, Michael Louis Miller, Ravi V. J. Chari
  • Publication number: 20200405870
    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: June 15, 2020
    Publication date: December 31, 2020
    Inventors: Ravi V.J. Chari, Michael Louis Miller, Manami Shizuka
  • Publication number: 20200397914
    Abstract: The invention relates to novel benzodiazepine derivatives with antiproliferative activity and more specifically to novel benzodiazepine compounds of formulae (I), (II) and (III). 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: December 27, 2018
    Publication date: December 24, 2020
    Inventors: Michael Louis Miller, Manami Shizuka, Ravi V.J. Chari
  • Patent number: 10844135
    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: Grant
    Filed: January 23, 2017
    Date of Patent: November 24, 2020
    Assignee: ImmunoGen, Inc.
    Inventors: Ravi V. J. Chari, Walter A. Blattler
  • Patent number: 10722588
    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: February 13, 2019
    Date of Patent: July 28, 2020
    Assignee: IMMUNOGEN, INC.
    Inventors: Ravi V. J. Chari, Michael Louis Miller, Manami Shizuka
  • Patent number: RE49918
    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: May 10, 2021
    Date of Patent: April 16, 2024
    Assignee: IMMUNOGEN, INC.
    Inventors: Wei Li, Michael Louis Miller, Nathan Elliott Fishkin, Ravi V. J. Chari