Patents by Inventor Mark P. LeGolvan

Mark P. LeGolvan 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).

  • 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