Patents by Inventor Frederick L. Weitl

Frederick L. Weitl 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).

  • Process for preparing 2,3-dihydroxybenzoic acid amides of tetraazaalkanes and cycloalkanes
    Patent number: 4543213
    Abstract: A compound of the formula: ##STR1## wherein X is hydrogen or a conventional electron-withdrawing group, particularly --SO.sub.3 H or a salt thereof; n is 2, 3, or 4; m is 2, 3, or 4; and p is 2 or 3. The present compounds are useful as specific sequestering agents for actinide (IV) ions. Also described is a method for the 2,3-dihydroxybenzamidation of azaalkanes.
    Type: Grant
    Filed: August 7, 1979
    Date of Patent: September 24, 1985
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Frederick L. Weitl, Kenneth N. Raymond
  • Polycatecholamide chelating agents
    Patent number: 4442305
    Abstract: Novel polybenzamide compounds useful for in vitro or in vivo chelation are described. The compounds have the formula ##STR1## Polyamines are reacted with 2,3-dimethoxy benzoyl chloride unsubstituted or substituted with SO.sub.3 H, SO.sub.3 M, NO.sub.2, CO.sub.2 H or CO.sub.2 M as desired is reacted with a polyamine in an inert solvent then demethylated with BBr.sub.3 or BCl.sub.3 in an inert solvent. Where compounds symmetrically substituted on the terminal N's are desired, the polyamine is first reductively alkylated by reaction with an aldehyde or ketone and the resulting Schiff base is hydrogenated.
    Type: Grant
    Filed: August 24, 1981
    Date of Patent: April 10, 1984
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Frederick L. Weitl, Kenneth N. Raymond
  • In vitro removal of actinide (IV) ions
    Patent number: 4309305
    Abstract: A compound of the formula: ##STR1## wherein X is hydrogen or a conventional electron-withdrawing group, particularly --SO.sub.3 H or a salt thereof; n is 2, 3, or 4; m is 2, 3, or 4; and p is 2 or 3. The present compounds are useful as specific sequestering agents for actinide (IV) ions. Also described is a method for the 2,3-dihydroxybenzamidation of azaalkanes.
    Type: Grant
    Filed: August 7, 1979
    Date of Patent: January 5, 1982
    Assignee: The United States as represented by the United States Department of Energy
    Inventors: Frederick L. Weitl, Kenneth N. Raymond
  • 2,3-Dihydroxybenzoic acid amides of tetraazaalkanes and tetaaza cycloalkanes
    Patent number: 4181654
    Abstract: A compound of the formula: ##STR1## wherein X is hydrogen or a conventional electron-withdrawing group, particularly --SO.sub.3 H or a salt thereof; n is 2, 3, or 4; m is 2, 3, or 4; and p is 2 or 3. The present compounds are useful as specific sequestering agents for actinide (IV) ions. Also described is a method for the 2,3-dihydroxybenzamidation of azaalkanes.
    Type: Grant
    Filed: July 24, 1978
    Date of Patent: January 1, 1980
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Frederick L. Weitl, Kenneth N. Raymond