Patents by Inventor Michel S. Lefebvre

Michel S. Lefebvre 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).

  • Apparatus including a flow path formed by membrane compression
    Patent number: 4624784
    Abstract: Apparatus for altering the concentration of a pre-selected component (11) of a feestock (12) wherein the feedstock (12) flows through flowpaths bounded by overlying barriers (13) which selectively pass the component (11). Flow of feedstock (12) elastically separates the barriers (13) to maintain laminar flow therebetween. The preselected component (11) may be routed to flow selectively through the barriers (13) either into or out of the feedstock (12).
    Type: Grant
    Filed: December 10, 1984
    Date of Patent: November 25, 1986
    Assignee: Memtec Limited
    Inventor: Michel S. Lefebvre
  • Chemical modification of membrane to modify transport properties
    Patent number: 4599364
    Abstract: The transport properties of a polymeric ultrafiltration membrane are modified by passing aqueous liquid through the membrane at a temperature less than the glass transition temperature, progressively lowering the pH of the liquid to break hydrogen bonds in the polymer, and reacting the activated polymer with a reagent which is a reactive textile finishing product.
    Type: Grant
    Filed: December 17, 1984
    Date of Patent: July 8, 1986
    Assignee: Limit Instant Limited
    Inventor: Michel S. Lefebvre