Patents by Inventor Robert J. Schultz

Robert J. Schultz 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).

  • Preparation of N-(phosphonoacetyl)-L-aspartic acid
    Patent number: 4179464
    Abstract: Improved methods for preparation of the tetrasodium and disodium salts of N-(phosphonoacetyl)-L-aspartic acid (PALA) are disclosed. The present methods are well suited for preparation of these products in large amounts. Particular aspects of these methods include: (1) initial preparation of the PALA moiety as the dibenzyl ester; (2) the complete removal of impurities in the form of acetic acid and sodium acetate from disodium PALA by turbulent flow precipitation; and (3) preparation and purification of the cyclohexylammonium salt of dibenzyl PALA which ultimately results in a purer final product.
    Type: Grant
    Filed: August 10, 1978
    Date of Patent: December 18, 1979
    Inventors: Robert J. Schultz, Fred W. Starks