Patents by Inventor Robert D. Clay

Robert D. Clay 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 extracting lipids and organics from animal and plant matter or organics-containing waste streams
    Patent number: 5707673
    Abstract: In a solvent extraction process for the extraction of an extractive from extractive-containing material employing in an extraction zone operating under extraction conditions a process solvent, whereby a miscella comprising a portion of the process solvent and a portion of the extractive, and an extractive-depleted substrate is formed, the improvement to which comprises: (a) removing the miscella from the extraction zone under extraction conditions, (b) filtering the miscella by use of a microfiltration, an ultrafiltration, a nanofiltration, or a reverse osmosis membrane, under conditions which achieve a differential pressure across said membrane, to separate the solvent in the miscella from the extractive in the miscella, and (c) recycling under extraction conditions at least a portion of the separated solvent to the extraction zone.
    Type: Grant
    Filed: October 4, 1996
    Date of Patent: January 13, 1998
    Assignee: PreWell Industries, L.L.C.
    Inventors: John E. Prevost, Robert D. Clay, John R. Fielding