Patents by Inventor Russell J. MacDonald

Russell J. MacDonald 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).

  • Anion selective polymers prepared from concentrated solutions of N,N'-methylenebisacrylamide
    Patent number: 5037858
    Abstract: This invention is directed to producing highly concentrated solutions of methylenebisacrylamide and thereafter blending with ionogeneous acrylic monomers to produce low porosity, highly crosslinked, water insoluble polymers for use as anion selective resins and membranes.
    Type: Grant
    Filed: June 21, 1990
    Date of Patent: August 6, 1991
    Assignee: Ionics, Incorporated
    Inventor: Russell J. MacDonald
  • Acid efficient membrane for use in electrodialysis for recovery of acid
    Patent number: 4822471
    Abstract: This invention is directed to the process and apparatus for making a polymeric membrane containing non-quaternized amine groups, with the polymer having substantially zero amounts of non-polymerized solvents. The resulting membrane is a more efficient anion membrane for recovering acid from acidic solutions by electrodialysis than the corresponding membranes containing quaternized amine groups. The membrane is made by polymerizing a monomeric mixture on a reinforcing cloth structure, which monomeric mixture is void of non-polymerizing solvents.
    Type: Grant
    Filed: April 5, 1988
    Date of Patent: April 18, 1989
    Assignee: Ionics, Incorporated
    Inventor: Russell J. MacDonald
  • Synthesis of highly cross-linked cation-exchange polymers from an aqueous solution
    Patent number: 4617321
    Abstract: The invention comprises the manufacture of cation exchangers by the copolymerization of a sulfonic acid with two other monomers such as acrylamide and n-methylolacrylamide which react simultaneously with the polymerization to form a cross-linking unit. The non-polymerizing (NP) solvent employed is water.
    Type: Grant
    Filed: July 2, 1985
    Date of Patent: October 14, 1986
    Assignee: Ionics, Incorporated
    Inventor: Russell J. MacDonald
  • Synthesis of water soluble cross-linkers and their use in the manufacture of anionic polymers
    Patent number: 4374720
    Abstract: The reaction of glycidyl methacrylate (GMA) with an ionogenic methacrylate ester containing amine groups of the tertiary type such as dimethylaminoethyl methacrylate (DMAEMA) in the presence of an acidic water solution produces a new and novel water soluble, ionic, cross-linking, methacrylate bifunctional monomer which is useful in the manufacture of anion exchange polymers while employing an aqueous solvent system.
    Type: Grant
    Filed: August 21, 1981
    Date of Patent: February 22, 1983
    Assignee: Ionics, Incorporated
    Inventor: Russell J. MacDonald
  • Synthesis of water soluble cross-linkers and their use in the manufacture of anionic polymers
    Patent number: 4310631
    Abstract: The reaction of glycidyl methacrylate (GMA) with an ionogenic methacrylate ester containing amine groups of the tertiary type such as dimethylaminoethyl methacrylate (DMAEMA) in the presence of an acidic water solution produces a new and novel water soluble, ionic, cross-linking, methacrylate bifunctional monomer wnhich is useful in the manufacture of anion exchange polymers while employing an aqueous solvent system.
    Type: Grant
    Filed: December 13, 1980
    Date of Patent: January 12, 1982
    Assignee: Ionics Inc.
    Inventor: Russell J. MacDonald
  • Synthesis of water soluble cross-linkers and their use in the manufacture of anionic polymers
    Patent number: 4275227
    Abstract: The reaction of glycidyl methacrylate (GMA) with an ionogenic methacrylate ester containing amine groups of the tertiary type such as dimethylaminoethyl methacrylate (DMAEMA) in the presence of an acidic water solution produces a new and novel water soluble, ionic, cross-linking, methacrylate bifunctional monomer which is useful in the manufacture of anion exchange polymers while employing an aqueous solvent system.
    Type: Grant
    Filed: October 12, 1979
    Date of Patent: June 23, 1981
    Assignee: Ionics Inc.
    Inventor: Russell J. MacDonald