Patents by Inventor Victor M. Barreto

Victor M. Barreto 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).

  • Ion chromatography system using electrochemical suppression and detector effluent recycle
    Patent number: 5352360
    Abstract: A method of streamlining and lowering the cost of operation of ion chromatography as well as improving detection limits is disclosed. The apparatus includes chromatographic separating means through which a sample is eluted in an eluent solution including an electrolyte. The apparatus includes suppressor means having a chromatography effluent compartment means separated from a detector effluent compartment means by an ion exchange membrane, forming a chromatography effluent flow channel and a detector effluent channel, respectively. Electrode means are disposed in communication with both flow channels for passing an electric current transverse to the solution that is passing through them. The chromatography effluent flows through the chromatography effluent flow channel of the suppressor and through detector means which detects resolved ionic species therein.
    Type: Grant
    Filed: July 1, 1993
    Date of Patent: October 4, 1994
    Assignee: Dionex Corporation
    Inventors: John R. Stillian, Victor M. Barreto, Keith A. Friedman, Steven B. Rabin, Mahmood Toofan
  • Ion chromatography system using electrochemical suppression and detector effluent recycle
    Patent number: 5248426
    Abstract: A method of streamlining and lowering the cost of operation of ion chromatography as well as improving detection limits is disclosed. The apparatus includes chromatographic separating means through which a sample is eluted in an eluent solution including an electrolyte. The apparatus includes suppressor means having a chromatography effluent compartment means separated from a detector effluent compartment means by an ion exchange membrane, forming a chromatography effluent flow channel and a detector effluent channel, respectively. Electrode means are disposed in communication with both flow channels for passing an electric current transverse to the solution that is passing through them. The chromatography effluent flows through the chromatography effluent flow channel of the suppressor and through detector means which detects resolved ionic species therein.
    Type: Grant
    Filed: October 29, 1992
    Date of Patent: September 28, 1993
    Assignee: Dionex Corporation
    Inventors: John R. Stillian, Victor M. Barreto, Keith A. Friedman, Steven B. Rabin, Mahmood Toofan