Patents by Inventor Henno Keskkula

Henno Keskkula 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).

  • Patent number: 4678833
    Abstract: Miscible blends of poly-2-oxazolines and thermoplastic polymers are disclosed herein. These blends exhibit a single glass transition point indicative of a miscible blend. The blends of this invention are useful as membranes, particularly separation membranes for mixtures of organic compounds or organic compounds and water and pervaporation process.
    Type: Grant
    Filed: June 19, 1986
    Date of Patent: July 7, 1987
    Assignee: The Dow Chemical Company
    Inventors: Kathleen M. McCreedy, Henno Keskkula, James C. Pawloski, Edward H. Yonkers
  • Patent number: 4576721
    Abstract: Miscible blends of poly-2-oxazolines and thermoplastic polymers are disclosed herein. These blends exhibit a single glass transition point indicative of a miscible blend. The blends of this invention are useful as membranes, particularly separation membranes for mixtures of organic compounds or organic compounds and water and a perevaporation process.
    Type: Grant
    Filed: May 21, 1985
    Date of Patent: March 18, 1986
    Assignee: The Dow Chemical Company
    Inventors: Kathleen M. McCreedy, Henno Keskkula, James C. Pawloski, Edward H. Yonkers
  • Patent number: 4547530
    Abstract: Miscible blends of poly-2-oxazolines and thermoplastic polymers are disclosed herein. These blends exhibit a single glass transition point indicative of a miscible blend. The blends of this invention are useful as membranes, particularly separation membranes for mixtures of organic compounds or organic compounds and water and a pervaporation process.
    Type: Grant
    Filed: November 15, 1983
    Date of Patent: October 15, 1985
    Assignee: The Dow Chemical Company
    Inventors: Kathleen M. McCreedy, James C. Pawloski, Henno Keskkula, Edward H. Yonkers
  • Patent number: 4508871
    Abstract: Innately-transparent, polymethylmethacrylate polyblends, and transparent shaped articles therefrom fabricated, are comprised with components therein of:(a) polymethylmethacrylate; and(b) at least one copolymer of styrene (and/or equivalent vinyl aromatic monomers) with one or more of certain vinyl acids; plus and optionally or as an alternative;(c) at least one mass-made acrylonitrile-butadiene-styrene or acrylonitrile-butadiene-styrene-type resin in addition to or in replacement of and substitution for said component (b).
    Type: Grant
    Filed: February 28, 1983
    Date of Patent: April 2, 1985
    Assignee: The Dow Chemical Company
    Inventors: Henno Keskkula, Kathleen M. McCreedy, Donald A. Maass
  • Patent number: 4460744
    Abstract: Excellently-propertied, physical and intimately-admixed blends of polymers (i.e., "polyblends") comprise in intimate admixtures (A) large particle size, mass-made acrylonitrile/butadiene/styrene (i.e., "ABS")-type resins; and (B) certain grafted and/or interpolymerized rubber concentrates (i.e., "MMA") or MMA copolymers with certain other acrylic and/or vinyl monomers onto predominantly polybutadiene (i.e., "PBD") elastomeric substrate(s).
    Type: Grant
    Filed: April 20, 1981
    Date of Patent: July 17, 1984
    Assignee: The Dow Chemical Company
    Inventors: Henno Keskkula, Donald A. Maass, Kathleen M. McCreedy
  • Patent number: 4366289
    Abstract: Nicely compatibilized polymer blends (i.e., "polyblends") exhibiting attendant physical properties which are generally improved over those intrinsically coincident with the individual polymeric ingredients therein are comprised, as fundamental Components therefor, of:(A) a substantial and effectively compatibilizing quantity of a graft or block inter- or copolymer of methyl methacrylate (i.e., "MMA") and/or equivalent acrylate monomer(s) on or with a synthetic or natural rubber elastomer (i.e., "EL") substrate as a basic component of the polyblend which is referred to hereinafter as an MMA-grafted rubber concentrate or, by way of simplified acronymical definition of same, a "GRC(MMA)" which is constitutionally substantially if not entirely free of any non-interpolymerized polymethylmethacrylate (i.e.
    Type: Grant
    Filed: April 20, 1981
    Date of Patent: December 28, 1982
    Assignee: The Dow Chemical Company
    Inventors: Henno Keskkula, Donald A. Maass, Kathleen M. McCreedy
  • Patent number: 4243765
    Abstract: Rubber concentrates for use in reinforcing acrylonitrile and styrene-containing polymers are prepared by graft polymerizing an acrylonitrile-styrene polymer on a rubber latex wherein a portion of the polymer is chemically combined with the rubber and a portion of the acrylonitrile-styrene polymer is not chemically combined. The uncombined or matrix polymer is of relatively low molecular weight.
    Type: Grant
    Filed: December 29, 1976
    Date of Patent: January 6, 1981
    Assignee: The Dow Chemical Company
    Inventors: Henno Keskkula, Frederick A. Miller