Patents by Inventor Yuri Svirkin

Yuri Svirkin 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).

  • Thiolated PEG-PVA hydrogels
    Patent number: 9873769
    Abstract: A method of forming thiolated poly(vinyl alcohol) hydrogels including reacting, in the presence of an acid, compounds containing a thiol functional group and a hydroxyl reactive group with one or more hydroxyl groups of poly(vinyl alcohol) via said hydroxyl reactive group, thereby forming thiolated poly(vinyl alcohol). The method further including reacting the thiol functional group of said compounds with a thiol reactive group of a crosslinker, thereby forming a hydrogel.
    Type: Grant
    Filed: July 10, 2014
    Date of Patent: January 23, 2018
    Assignee: CAMBRIDGE POLYMER GROUP, INC.
    Inventors: Gavin Braithwaite, Yuri Svirkin
  • THIOLATED PEG-PVA HYDROGELS
    Publication number: 20160009872
    Abstract: A method of forming thiolated poly(vinyl alcohol) hydrogels including reacting, in the presence of an acid, compounds containing a thiol functional group and a hydroxyl reactive group with one or more hydroxyl groups of poly(vinyl alcohol) via said hydroxyl reactive group, thereby forming thiolated poly(vinyl alcohol). The method further including reacting the thiol functional group of said compounds with a thiol reactive group of a crosslinker, thereby forming a hydrogel.
    Type: Application
    Filed: July 10, 2014
    Publication date: January 14, 2016
    Inventors: Gavin BRAITHWAITE, Yuri SVIRKIN
  • Compositions of hyaluronic acid and methods of use
    Publication number: 20060094643
    Abstract: The invention provides compositions for the treatment of disorders characterized by dryness including dry eye and dry mouth. The compositions commonly comprise a conjugate of hyaluronic acid and polylysine. These conjugates are attached to affected body tissues or surfaces using transglutaminase, and preferably endogenous transglutaminase.
    Type: Application
    Filed: July 3, 2003
    Publication date: May 4, 2006
    Inventors: Yuri Svirkin, Ramine Parsa, Dmitry Zingerman
  • Production of polyorganophosphazenes having desired molecular weights
    Patent number: 5869016
    Abstract: A method for producing a polyorganophosphazene, such as, for example, poly?di(carboxylatophenoxy)phosphazenel!, from polydichlorophosphazene. The polydichlorophosphazene is reacted with at least one nucleophilic reagent at a defined molar ratio of the at least one nucleophilic reagent to the polydichlorophosphazene. Such process results in the production of a polyorganophosphazene having a molecular weight within a desired range.
    Type: Grant
    Filed: June 18, 1997
    Date of Patent: February 9, 1999
    Assignee: Virus Research Institute, Inc.
    Inventors: Alexander K. Andrianov, Mark P. LeGolvan, Yuri Svirkin, Sameer S. Sule
  • Purification of polyphosphazene polyacids
    Patent number: 5842471
    Abstract: A method for purification of a polyphosphazene polyacid or acid salt thereof in which a polyphosphazene polyacid or acid salt thereof is dissolved in a concentrated aqueous solution of a salt of monovalent ions. The resulting aqueous solution of the polyphosphazene polyacid or acid salt thereof and the at least one salt of monovalent ions then is diluted to reduce the concentration of the at least one salt of monovalent ions, whereby the polyphosphazene polyacid or acid salt thereof is precipitated. The precipitated polyphosphazene polyacid or acid salt thereof then is recovered.
    Type: Grant
    Filed: May 14, 1997
    Date of Patent: December 1, 1998
    Assignee: Virus Research Institute, Inc.
    Inventors: Alexander K. Andrianov, Mark P. LeGolvan, Yuri Svirkin, Sameer S. Sule