Patents by Inventor Leon E. St-Pierre

Leon E. St-Pierre 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: 5427777
    Abstract: Novel ingestible polymeric phosphonium salts have the formula: ##STR1## wherein P' represents a cross-linked and non-digestible polymer backbone; R is a lower alkyl radical; X.sup.- is a pharmaceutically acceptable anion; n, n.sub.1 and n.sub.2 are, independently, integers varying from 0 to 6 inclusive, with the proviso that when m.sub.1 .gtoreq.1, n.sub.2 .gtoreq.1; and o.sub.1, o.sub.2, p.sub.1 p.sub.2, q.sub.1 and q.sub.2 are, independently, integers varying from 1 to 6 inclusive. The polymeric phosphonium salts of the invention are highly efficient sorbents for bile acids and salts and can thus be used for reducing hypercholesterolemia in affected humans.
    Type: Grant
    Filed: March 23, 1992
    Date of Patent: June 27, 1995
    Assignee: Lowchol Scientific, Inc.
    Inventors: Leon E. St. Pierre, George R. Brown, Zhanjie Tan, Sophie-Dorothee Clas
  • Patent number: 5374422
    Abstract: The invention is concerned with novel ingestible cross-linked homopolymers having functional groups consisting of linear or branched amines, of the formula: ##STR1## and their pharmaceutically acceptable salts of the formulae: ##STR2## wherein P(or POLYMER .parallel.-) represents a hydrophobic, cross-linked and non-digestible homopolymer backbone; R is a hydrogen atom or a lower alkyl radical; X.sup.- is a pharmaceutically acceptable anion; m is an integer varying from 1 to 6 inclusive; and n, o and p are, independently, integers varying from 2 to 12 inclusive. The amine functionalized and cross-linked homopolymers of the invention are highly efficient adsorbents for bile acids and salts and can thus be used for reducing hypercholesterolemia in affected humans.
    Type: Grant
    Filed: March 25, 1991
    Date of Patent: December 20, 1994
    Assignee: Lowchol Scientific, Inc.
    Inventors: Leon E. St. Pierre, George R. Brown, Gaoming Wu
  • Patent number: 5366724
    Abstract: The invention is concerned with novel ingestible polymeric amines in linear or branched form of the formula: ##STR1## and their pharmaceutically acceptable salts of the formulae: ##STR2## wherein P represents a hydrophilic, cross-linked and digestable polymer backbone; R is a hydrogen atom or a lower alkyl radical; X.sup.- is a pharmaceutically acceptable anion; m is an integer varying from 1 to 10 inclusive; and n, o and p are, independently, integers varying from 2 to 12 inclusive. The polymeric amines of the invention are highly efficient adsorbents for bile acids and salts and can thus be used for reducing hypercholesterolemia in affected humans.
    Type: Grant
    Filed: February 7, 1991
    Date of Patent: November 22, 1994
    Assignee: Lowchol Scientific, Inc.
    Inventors: Leon E. St. Pierre, George R. Brown, Gaoming Wu
  • Patent number: 5236701
    Abstract: The invention is concerned with novel ingestible cross-linked homopolymers having functional groups consisting of linear or branched amines, of the formula: ##STR1## and their pharmaceutically acceptable salts of the formulae: ##STR2## wherein P represents a hydrophilic, cross-linked and non-digestible homopolymer backbone; R is a hydrogen atom or a lower alkyl radical; X.sup.- is a pharmaceutically acceptable anion; m is an integer varying from 1 to 10 inclusive; and n, o and p are, independently, integers varying from 2 to 12 inclusive. The amine functionalized and cross-linked homopolymers of the invention are highly efficient adsorbents for bile acids and salts and can thus be used for reducing hypercholesterolemia in affected humans.
    Type: Grant
    Filed: July 19, 1989
    Date of Patent: August 17, 1993
    Assignee: Lowchol Scientific Inc.
    Inventors: Leon E. St. Pierre, George R. Brown, Gaoming Wu
  • Patent number: 5114709
    Abstract: The invention is concerned with a metal ion coordinated polyamine resin in which a non-toxic, pharmaceutically acceptable chelating metal ion is coordinated with a cross-linked and non-digestible polymeric amine selected from the group consisting of: (a) polyamine resins with a hydrophilic backbone, of the formula: ##STR1## wherein P represents a hydrophilic, cross-linked and non-digestible homopolymer backbone, m is an integer varying from 1 to 10 inclusive, and n, o and p are, independently, integers varying from 2 to 12 inclusive; (b) polyamine resins with a hydrophobic backbone, of the formula:P'--[NH(CH.sub.2).sub.n ].sub.m NH.sub.2 (II)wherein P' represents a hydrophobic, cross-linked and non-digestible homopolymer backbone, m is an integer varying from 0 to 6 inclusive and n is an integer varying from 2 to 12 inclusive; and (c) cross-linked copolymers of a polyethylenepolyamine containing from 2 to 6 ethylene units and epichlorohydrin.
    Type: Grant
    Filed: June 12, 1991
    Date of Patent: May 19, 1992
    Assignee: Lowchol Scientific Inc.
    Inventors: Leon E. St. Pierre, George R. Brown, Gaoming Wu, Youlu Yu
  • Patent number: 4593073
    Abstract: The invention is concerned with a novel polymer addition product comprising hydrophilic polymer backbone having a molecular weight of at least about 5,000 and to which are attached amino acid containing pendants, the pendants containing at least one arginine or lysine amino acid. The polymeric compounds of the invention are highly efficient adsorbents for bilirubin and other bile pigments, as well as for bile acids such as cholic acid.
    Type: Grant
    Filed: April 23, 1985
    Date of Patent: June 3, 1986
    Assignee: The Royal Institution for the Advancement of Learing (McGill Univ.)
    Inventors: Leon E. St-Pierre, G. Ronald Brown, Dominique S. Henning, Marlene Bouvier