Patents by Inventor Amarnauth Shastrie Prashad

Amarnauth Shastrie Prashad 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: 20200230256
    Abstract: An antibody production process in mammalian cells in which engineered unpaired cysteine residues are post-translationally modified and capped with particular chemical entities, which capped antibodies are well suited to further site-specific conjugation steps to form antibody-drug conjugates (ADCs) or protein drug conjugates; ADCs produced using these capped antibodies including in particular ADCs formed by the selective reduction of the capped antibodies' cysteine residues, and ADCs formed using chemical handles such as aldehyde/azide/alkyne biorthogonal groups, which permit additional drug conjugation chemistry; and uncapped antibodies produced by cells in low cysteine, cysteine and glutathione media, and ADCs produced via direct conjugation to these uncapped antibodies.
    Type: Application
    Filed: March 3, 2020
    Publication date: July 23, 2020
    Applicant: PFIZER INC.
    Inventors: Xiaotian Zhong, Amarnauth Shastrie Prashad, Ronald William Kriz, Tao He, Will Somers, Wenge Wang, Leo Joseph Letendre
  • Patent number: 10653794
    Abstract: An antibody production process in mammalian cells in which engineered unpaired cysteine residues are post-translationally modified and capped with particular chemical entities, which capped antibodies are well suited to further site-specific conjugation steps to form antibody-drug conjugates (ADCs) or protein drug conjugates; ADCs produced using these capped antibodies including in particular ADCs formed by the selective reduction of the capped antibodies' cysteine residues, and ADCs formed using chemical handles such as aldehyde/azide/alkyne biorthogonal groups, which permit additional drug conjugation chemistry; and uncapped antibodies produced by cells in low cysteine, cysteine and glutathione media, and ADCs produced via direct conjugation to these uncapped antibodies.
    Type: Grant
    Filed: August 9, 2016
    Date of Patent: May 19, 2020
    Assignee: Pfizer Inc.
    Inventors: Xiaotian Zhong, Amarnauth Shastrie Prashad, Ronald William Kriz, Tao He, Will Somers, Wenge Wang, Leo Joseph Letendre
  • Publication number: 20190381182
    Abstract: Optimizing production of selectively capped, and uncapped, cysteines on antibodies by manipulation of cell growth conditions including the deliberate depletion of cysteine and/or cystine in the cell culture process by way of media components, batch duration, or cell density to achieve efficient production of proteins including antibody-drug-conjugates (ADCs); conjugating a TNB-capped cysteine-containing protein by reacting it with a reducing agent capable of detaching the TNB-capping moieties from the protein without significantly reducing antibody inter-chain sulfur bonds, and conjugating reduced sulfur bonds on the protein to a payload through a reactive linking moiety.
    Type: Application
    Filed: February 1, 2018
    Publication date: December 19, 2019
    Applicant: PFIZER INC.
    Inventors: Kaushik DUTTA, Jose Manuel GOMES, Frank W. KOTCH, Vimalkumar B. PATEL, Amarnauth Shastrie PRASHAD, Renee L. PROCOPIO-MELINO, Xiaotian ZHONG
  • Patent number: 10508081
    Abstract: The present invention relates to intermediates of Formula I and to methods of synthesizing and purifying calicheamicin derivatives.
    Type: Grant
    Filed: January 12, 2018
    Date of Patent: December 17, 2019
    Assignee: Pfizer Inc.
    Inventors: Robert Wayne Dugger, Leo Joseph Letendre, Vimalkumar Babubhai Patel, Amarnauth Shastrie Prashad, Chunchun Zhang
  • Publication number: 20190030183
    Abstract: An antibody production process in mammalian cells in which engineered unpaired cysteine residues are post-translationally modified and capped with particular chemical entities, which capped antibodies are well suited to further site-specific conjugation steps to form antibody-drug conjugates (ADCs) or protein drug conjugates; ADCs produced using these capped antibodies including in particular ADCs formed by the selective reduction of the capped antibodies' cysteine residues, and ADCs formed using chemical handles such as aldehyde/azide/alkyne biorthogonal groups, which permit additional drug conjugation chemistry; and uncapped antibodies produced by cells in low cysteine, cysteine and glutathione media, and ADCs produced via direct conjugation to these uncapped antibodies.
    Type: Application
    Filed: August 9, 2016
    Publication date: January 31, 2019
    Applicant: PFIZER INC.
    Inventors: Xiaotian Zhong, Amarnauth Shastrie Prashad, Ronald William Kriz, Tao He, Will Somers, Wenge Wang, Leo Joseph Letendre
  • Publication number: 20180134656
    Abstract: The present invention relates to intermediates of Formula I and to methods of synthesizing and purifying calicheamicin derivatives.
    Type: Application
    Filed: January 12, 2018
    Publication date: May 17, 2018
    Applicant: PFIZER INC.
    Inventors: Robert Wayne Dugger, Leo Joseph Letendre, Vimalkumar Babubhai Patel, Amarnauth Shastrie Prashad, Chunchun Zhang
  • Patent number: 9902691
    Abstract: The present invention relates to intermediates of Formula I and to methods of synthesizing and purifying calicheamicin derivatives.
    Type: Grant
    Filed: October 28, 2014
    Date of Patent: February 27, 2018
    Assignee: Pfizer Inc.
    Inventors: Robert Wayne Dugger, Leo Joseph Letendre, Vimalkumar Babubhai Patel, Amarnauth Shastrie Prashad, Chunchun Zhang
  • Publication number: 20160251389
    Abstract: The present invention relates to intermediates of Formula I and to methods of synthesizing and purifying calicheamicin derivatives.
    Type: Application
    Filed: October 28, 2014
    Publication date: September 1, 2016
    Applicant: Pfizer Inc.
    Inventors: Robert Wayne Dugger, Leo Joseph Letendre, Vimalkumar Babubhai Patel, Amarnauth Shastrie Prashad, Chunchun Zhang
  • Publication number: 20110028455
    Abstract: Disclosed are compounds of formula (I) and pharmaceutically acceptable salts thereof, wherein X is —O—, —N(R3)—, —S—, —S(O)— or —S(O)2—; R2 is a C1-4 alkyl group or —CF3; and R1, R3, R4 and p are as defined herein; wherein the compounds are useful as kinase inhibitors. Also disclosed are pharmaceutical compositions containing, and intermediate compounds and methods for making the compounds of formula (I) and their pharmaceutically acceptable salts; and methods of using the foregoing to treat inflammatory and autoimmune diseases such as asthma, colitis, multiple sclerosis, psoriasis, arthritis, rheumatoid arthritis, inflammatory bowel disease, and joint inflammation.
    Type: Application
    Filed: December 12, 2008
    Publication date: February 3, 2011
    Applicant: Wyeth LLC
    Inventors: Diane Harris Boschelli, Yanong Daniel Wang, Amarnauth Shastrie Prashad, Zhong Li, Chuansheng Niu
  • Patent number: 7781591
    Abstract: The present teachings provide compounds of formula I and their pharmaceutically acceptable salts, hydrates, and esters, wherein R1, R2, and X are as defined herein. The present teachings also provide methods of making the compounds of formula I, and methods of treating autoimmune and inflammatory diseases by administering a therapeutically effective amount of a compound or compounds of formula I to a mammal including a human.
    Type: Grant
    Filed: June 13, 2007
    Date of Patent: August 24, 2010
    Assignee: Wyeth LLC
    Inventors: Derek Cecil Cole, Diane Harris Boschelli, Yanong Daniel Wang, Magda Asselin, Diane Marie Joseph-McCarthy, Amarnauth Shastrie Prashad, Allan Wissner, Russell Dushin, Biqi Wu, Lawrence Nathan Tumey, Chuan S. Niu, Joan Chen
  • Publication number: 20070287738
    Abstract: The present teachings provide compounds of formula I and their pharmaceutically acceptable salts, hydrates, and esters, wherein R1, R2, and X are as defined herein. The present teachings also provide methods of making the compounds of formula I, and methods of treating autoimmune and inflammatory diseases by administering a therapeutically effective amount of a compound or compounds of formula I to a mammal including a human.
    Type: Application
    Filed: June 13, 2007
    Publication date: December 13, 2007
    Inventors: Derek Cecil Cole, Magda Asselin, Diane Harris Boschelli, Allan Wissner, Yanong Daniel Wang, Amarnauth Shastrie Prashad, Russell Dushin