Patents Represented by Attorney Francis H. Deef

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  • Purification process
    Patent number: 3936495
    Abstract: The p-toluene sulfonic acid addition salt of .alpha.-hydrazino-.alpha.-methyl-.beta.-(3,4-dihydroxyphenyl)propionic acid is formed to readily allow crystallization of the product from solution. The acid addition salt may be dissolved and then neutralized to obtain the free base in pure form.
    Type: Grant
    Filed: November 27, 1973
    Date of Patent: February 3, 1976
    Assignee: Merck & Co., Inc.
    Inventor: Alan P. Sullivan, Jr.