Patents by Inventor Jose Hernandez Barajas

Jose Hernandez Barajas 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 flocculants with improved dewatering characteristics
    Patent number: 6667374
    Abstract: A high molecular weight water soluble acrylamide based polymer having improved flocculating and dewatering properties is provided. The polymer is prepared by a process in which a small quantity of a chain branching agent is added to the polymerization reaction mixture continuously or stepwise while the monomers are polymerized. The polymer is useful in solid/liquid separations such as flocculants and coagulants in wastewater treatment applications, and as thickening agents.
    Type: Grant
    Filed: March 13, 2002
    Date of Patent: December 23, 2003
    Assignee: Ecole Polytechnique Federal de Lausanne
    Inventors: Jose Hernandez-Barajas, Christine Wandrey, David Hunkeler
  • Polymer flocculants with improved dewatering characteristics
    Patent number: 6617402
    Abstract: A high molecular weight water soluble acrylamide based polymer having improved flocculating and dewatering properties is provided. The polymer is prepared by a process in which a small quantity of a chain branching agent is added to the polymerization reaction mixture continuously or stepwise while the monomers are polymerized. The polymer is useful in solid/liquid separations such as flocculants and coagulants in wastewater treatment applications, and as thickening agents.
    Type: Grant
    Filed: March 13, 2002
    Date of Patent: September 9, 2003
    Assignee: Ecole Polytechnique Federale de Lausanne (EPFL)
    Inventors: Jose Hernandez-Barajas, Christine Wandrey, David Hunkeler
  • Polymer flocculants with improved dewatering characteristics
    Publication number: 20020137858
    Abstract: A high molecular weight water soluble acrylamide based polymer having improved flocculating and dewatering properties is provided. The polymer is prepared by a process in which a small quantity of a chain branching agent is added to the polymerization reaction mixture continuously or stepwise while the monomers are polymerized. The polymer is useful in solid/liquid separations such as flocculants and coagulants in wastewater treatment applications, and as thickening agents.
    Type: Application
    Filed: March 13, 2002
    Publication date: September 26, 2002
    Applicant: Ecole POlytechnique Federale De Lausanne (EPFL)
    Inventors: Jose Hernandez-Barajas, Christine Wandrey, David Hunkeler
  • Polymer flocculants with improved dewatering characteristics
    Publication number: 20020132948
    Abstract: A high molecular weight water soluble acrylamide based polymer having improved flocculating and dewatering properties is provided. The polymer is prepared by a process in which a small quantity of a chain branching agent is added to the polymerization reaction mixture continuously or stepwise while the monomers are polymerized. The polymer is useful in solid/liquid separations such as flocculants and coagulants in wastewater treatment applications, and as thickening agents.
    Type: Application
    Filed: March 13, 2002
    Publication date: September 19, 2002
    Applicant: Ecole Polytechnique Federale De Lausanne (EPFL)
    Inventors: Jose Hernandez-Barajas, Christine Wandrey, David Hunkeler
  • Polymer flocculants with improved dewatering characteristics
    Patent number: 6294622
    Abstract: A high molecular weight water soluble acrylamide based polymer having improved flocculating properties is provided. The polymer is prepared by a process, in which a small quantity of a chain branching agent is added to the polymerization reaction mixture continuously or semi-continuously while the monomers are polymerized. The polymer is useful in solid/liquid separations such as flocculants and coagulants in waste water treatment applications, and as thickening agents.
    Type: Grant
    Filed: September 27, 1999
    Date of Patent: September 25, 2001
    Assignee: Ecole Polytechnique Federale de Lausanne (EPFL)
    Inventors: Jose Hernandez Barajas, Christine Wandrey, David Hunkeler