Patents Represented by Attorney T. B. Leslie

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  • Method for separating gases
    Patent number: 4264338
    Abstract: An improved process for the separation of gases by selective membrane diffusion or permeation by means of plural stages of membrane separation without increasing the work required by directing a permeant mixture from a second or later stage of separation to a recycle stage of membrane separation to provide a permeate enriched in the desired gas or gases and blending said permeate with the gaseous feed to said second or later stage of separation.
    Type: Grant
    Filed: August 16, 1979
    Date of Patent: April 28, 1981
    Assignee: Monsanto Company
    Inventor: Harold R. Null
  • Hollow fiber membranes of ethylene copolymers and process for use
    Patent number: 4082658
    Abstract: Hollow fiber membranes of copolymers of ethylene with 5 to 20 weight percent of copolymerizable vinyl monomers display much superior permeabilities to organic compounds than do polyethylene hollow fibers, less loss of permeability upon storage or use and good strength. Use of such new hollow fiber membranes affords an improved process for the separation of phenols from aqueous solutions thereof through permeation.
    Type: Grant
    Filed: February 9, 1977
    Date of Patent: April 4, 1978
    Assignee: Monsanto Company
    Inventors: Alfred Keith Fritzsche, Richard L. Leonard