Patents by Inventor Jong-Seok Bark

Jong-Seok Bark 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).

  • Polymer blends that swell in an acidic environment and deswell in a basic environment
    Patent number: 7182957
    Abstract: A polymer blend is prepared by dissolving chitosan and a second polymer in an acidic aqueous solution to form an aqueous polymer blend, dehydrating said aqueous polymer blend, and recovering said polymer blend. The second polymer may be selected from the group consisting of polyether glycols including polyethylene glycols; cellulose esters including cellulose acetate; poloxamers; polysaccharides including dextran and guar; polyvinylpyrrolidones; polyvinyl alcohols; and mixtures or copolymers thereof. These polymer blends swell in an acidic environment and deswell in a more neutral or basic environment. This technology is valuable for the dispensing of biologically active material or drugs into a surrounding environment, especially the environment as is found in the gastrointestinal tract.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: February 27, 2007
    Assignee: Macromed, Inc.
    Inventors: Gaylen M. Zentner, Jong-Seok Bark, Feng Liu
  • Polymer blends that swell in an acidic environment and deswell in a basic environment
    Patent number: 6730327
    Abstract: A polymer blend is prepared by dissolving chitosan and a second polymer in an acidic aqueous solution to form an aqueous polymer blend, dehydrating said aqueous polymer blend, and recovering said polymer blend. The second polymer may be selected from the group consisting of polyether glycols including polyethylene glycols; cellulose esters including cellulose acetate; poloxamers; polysaccharides including dextran and guar; polyvinylpyrrolidones; polyvinyl alcohols; and mixtures or copolymers thereof. These polymer blends swell in an acidic environment and deswell in a more neutral or basic environment. This technology is valuable for the dispensing of biologically active material or drugs into a surrounding environment, especially the environment as is found in the gastrointestinal tract.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: May 4, 2004
    Assignee: MacroMed, Inc.
    Inventors: Gaylen M. Zentner, Jong-Seok Bark, Feng Liu
  • Polymer blends that swell in an acidic environment and deswell in a basic environment
    Publication number: 20030139495
    Abstract: A polymer blend is prepared by dissolving chitosan and a second polymer in an acidic aqueous solution to form an aqueous polymer blend, dehydrating said aqueous polymer blend, and recovering said polymer blend. The second polymer may be selected from the group consisting of polyether glycols including polyethylene glycols; cellulose esters including cellulose acetate; poloxamers; polysaccharides including dextran and guar; polyvinylpyrrolidones; polyvinyl alcohols; and mixtures or copolymers thereof. These polymer blends swell in an acidic environment and deswell in a more neutral or basic environment. This technology is valuable for the dispensing of biologically active material or drugs into a surrounding environment, especially the environment as is found in the gastrointestinal tract.
    Type: Application
    Filed: December 20, 2002
    Publication date: July 24, 2003
    Inventors: Gaylen M. Zentner, Jong-Seok Bark, Feng Liu
  • Polymer blends that swell in an acidic environment and deswell in a basic environment
    Publication number: 20030124189
    Abstract: A polymer blend is prepared by dissolving chitosan and a second polymer in an acidic aqueous solution to form an aqueous polymer blend, dehydrating said aqueous polymer blend, and recovering said polymer blend. The second polymer may be selected from the group consisting of polyether glycols including polyethylene glycols; cellulose esters including cellulose acetate; poloxamers; polysaccharides including dextran and guar; polyvinylpyrrolidones; polyvinyl alcohols; and mixtures or copolymers thereof. These polymer blends swell in an acidic environment and deswell in a more neutral or basic environment. This technology is valuable for the dispensing of biologically active material or drugs into a surrounding environment, especially the environment as is found in the gastrointestinal tract.
    Type: Application
    Filed: December 20, 2002
    Publication date: July 3, 2003
    Inventors: Gaylen M. Zentner, Jong-Seok Bark, Feng Liu
  • Polymer blends that swell in an acidic environment and deswell in a basic environment
    Patent number: 6537584
    Abstract: A polymer blend is prepared by dissolving chitosan and a second polymer in an acidic aqueous solution to form an aqueous polymer blend, dehydrating said aqueous polymer blend, and recovering said polymer blend. The second polymer may be selected from the group consisting of polyether glycols including polyethylene glycols; cellulose esters including cellulose acetate; poloxamers; polysaccharides including dextran and guar; polyvinylpyrrolidones; polyvinyl alcohols; and mixtures or copolymers thereof. These polymer blends swell in an acidic environment and deswell in a more neutral or basic environment. This technology is valuable for the dispensing of biologically active material or drugs into a surrounding environment, especially the environment as is found in the gastrointestinal tract.
    Type: Grant
    Filed: November 9, 2000
    Date of Patent: March 25, 2003
    Assignee: MacroMed, Inc.
    Inventors: Gaylen M. Zentner, Jong-Seok Bark, Feng Liu