Patents by Inventor Joel-Raphael Racchini

Joel-Raphael Racchini 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).

  • Use of treated composite polyamide membranes to separate concentrated solute
    Patent number: 4964998
    Abstract: A method of separating water of reduced concentration of a selected solute via reverse osmosis, wherein the selected solute is sulfuric acid, sodium hydroxide, isopropanol, sodium nitrate or another solute having a much higher solute passage than sodium chloride. The reverse osmosis membrane is prepared by treating a crosslinked, polyamide discriminating layer with an amine-reactive reagent or compatible oxidant at conditions whereby the passage of the selected solute at a selected transmembrane pressure is reduced by at least 30 percent.
    Type: Grant
    Filed: December 13, 1989
    Date of Patent: October 23, 1990
    Assignee: FilmTec Corporation
    Inventors: John E. Cadotte, Joel-Raphael Racchini, Robert J. Petersen