NEW YORK - The American Stock Exchange is close to filing a patent for an actively-managed exchange-traded fund, but the structure of such a fund is still a mystery, said Debbie Fuhr, a vice president with Morgan Stanley & Co. International of London, a subsidiary of Morgan Stanley Dean Witter of New York.

AMEX has developed a formula for an actively-managed exchange-traded fund and will file a patent in the coming months, Fuhr told executives attending a conference here hosted by International Communications for Management Group of Chicago.

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