Patents by Inventor Curt Theis

Curt Theis 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).

  • Process for the preparation of dispersible colloidal systems of a substance in the form of nanoparticles
    Patent number: 5133908
    Abstract: The Process according to the invention comprises:(1) the preparation of a liquid phase consisting essentially of a solution of the substance in a solvent or in a mixture of solvents to which may be added one or more surfactants,(2) the preparation of a second liquid phase consisting essentially of a non-solvent of a mixture of non-solvents for the substance and to which may be added one or more surfactants, the non-solvent or the mixture of non-solvents for the substance being miscible in all proportions with the solvent or the mixture of solvents for the substance,(3) the addition of one of the liquid phases prepared in (1) or (2) to the other with moderate stirring so as to produce a colloidal suspension of nanoparticles of the substance and,(4) if desired, the removal of all or part of the solvent or the mixture of solvents for the substance and of the non-solvent or the mixture of non-solvents for the substance so as to produce a colloidal suspension of nanoparticles of the desired concentration or to pro
    Type: Grant
    Filed: June 30, 1989
    Date of Patent: July 28, 1992
    Assignee: Centre National de la Recherche Scientifique (CNRS)
    Inventors: Serge Stainmesse, Hatem Fessi, Jean-Phillppe Devissaguet, Francis Puisieux, Curt Theis