Patents by Inventor Dirk van Hemelrijk

Dirk van Hemelrijk 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).

  • 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