Patents by Inventor Noel S. Shehad

Noel S. Shehad 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).

  • Inhibition of the formation of nitrosamines
    Patent number: 5324857
    Abstract: Reaction of amine-containing substrates with hydrogen peroxide can suffer from certain problems, especially in the presence of transition metals. These problems include both in situ generation of impurities and particularly nitrosamines, which are allegedly carcinogenic, and also impaired product formation. The problems can be ameliorated by employing in the reaction mixture free radical scavengers, including in particular phenols and polyhydroxy-substituted aromatic compounds. The scavengers are advantageously employed in conjunction with a metal chelating agent such as polycarboxylic acid or an organopolyphosphonic acid.
    Type: Grant
    Filed: April 28, 1992
    Date of Patent: June 28, 1994
    Assignee: Solvay Interox
    Inventor: Noel S. Shehad
  • Reduction of nitrosamine formation
    Patent number: 5023376
    Abstract: Reaction of amine-containing substrates with hydrogen peroxide can suffer from the problems of in situ generation of nitrosamines, which are allegedly carcinogens, as impurities and impaired product formation, especially in the presence of transition metals.The problems can be ameliorated by employing a selected range of alkyleneaminopoly(methylenephosphonic acid) compounds such as cyclohexane-1,2-diaminotetra(methylenephosphonic acid).
    Type: Grant
    Filed: July 17, 1989
    Date of Patent: June 11, 1991
    Assignee: Interox America
    Inventors: Noel S. Shehad, Laurie L. Dussack, Dirk van Hemelrijk