Patents Represented by Attorney Michael E. Wheeler

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  • Sprayable mining liner
    Patent number: 7290960
    Abstract: A liner is the product of reaction of (a) a hydrophilic prepolymer bearing isocyanate groups; and (b) a water-borne polymer dispersion, the polymer bearing groups that are reactive to isocyanate groups; wherein the dispersion has a sufficiently high solids content, and the polymer has a sufficiently high modulus and glass transition or crystalline melting temperature, that the product of reaction exhibits a 24-hour Tensile Strength of at least about 2.5 MPa.
    Type: Grant
    Filed: December 23, 2005
    Date of Patent: November 6, 2007
    Assignee: 3M Innovative Properties Company
    Inventors: Ashok Sengupta, Jiangdong Tong
  • Sprayable mining liner
    Patent number: 7011865
    Abstract: A liner is the product of reaction of (a) a hydrophilic prepolymer bearing isocyanate groups; and (b) a water-borne polymer dispersion, the polymer bearing groups that are reactive to isocyanate groups; wherein the dispersion has a sufficiently high solids content, and the polymer has a sufficiently high modulus and glass transition or crystalline melting temperature, that the product of reaction exhibits a 24-hour Tensile Strength of at least about 2.5 MPa.
    Type: Grant
    Filed: September 6, 2002
    Date of Patent: March 14, 2006
    Assignee: 3M Innovative Properties Company
    Inventors: Ashok Sengupta, Jiangdong Tong
  • Process for reducing residual isocyanate
    Patent number: 6664414
    Abstract: The invention provides a process for reducing the amount of monomeric polyisocyanate in a composition comprising a polymer or oligomer bearing isocyanate groups, the method comprising reacting the composition with a quenching agent, the quenching agent comprising an arylalkyl alcohol and an alkoxysilane bearing a secondary amino group.
    Type: Grant
    Filed: September 11, 2001
    Date of Patent: December 16, 2003
    Assignee: 3M Innovative Properties Company
    Inventors: Jiangdong Tong, Ashok Sengupta
  • Method of pacifying stickies in paper
    Patent number: 4923566
    Abstract: Urea is used to pacify "stickies" in the manufacture of paper products, particularly coated boxboard.
    Type: Grant
    Filed: April 26, 1989
    Date of Patent: May 8, 1990
    Assignee: Nalco Chemical Company
    Inventors: Shamel M. Shawki, Richard N. Van Oss