Patents Represented by Attorney A. Copper Ancona

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  • Control of metal ions using bis(aminoalkyl) piperazine derivatives
    Patent number: 4770791
    Abstract: It has now been found that certain phosphonate derivatives of bis(aminoalkyl) piperazines are good threshold agents to prevent metal ion precipitation in aqueous solutions. They also function as sequestering and/or chelating agents as do those which do not contain the phosphonate group.
    Type: Grant
    Filed: April 3, 1987
    Date of Patent: September 13, 1988
    Assignee: The Dow Chemical Company
    Inventors: Druce K. Crump, Jaime Simon, David A. Wilson