Patents by Inventor Barbara Mary-Ann Lempka

Barbara Mary-Ann Lempka 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).

  • Method for the removal of metals from solution by means of activated silica
    Patent number: 6077439
    Abstract: The surprising ability of the polysilicate microgels commonly known as "activated silica" to adsorb and to release heavy metals selectively as a function of pH is used in a novel method for separating metals from dilute aqueous solution by means of selective precipitation with and recovery from an activated silica absorbent, selected changes to the pH. The process is particularly intended for the economic purification of contaminated waste streams to recover valuable but toxic heavy metals from such effluents at a lower cost than hitherto possible, using an activated silica substrate which may be regenerated by alkali treatment.
    Type: Grant
    Filed: August 22, 1997
    Date of Patent: June 20, 2000
    Assignee: McGill University
    Inventors: Elias Gebran El-Ammouri, Philip Andrew Distin, Barbara Mary-Ann Lempka, Rodger Graham Hagens