Patents by Inventor Antoon H. T. Halderit

Antoon H. T. Halderit 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).

  • Reclaiming .epsilon.-caprolactam from carpet waste
    Patent number: 5556890
    Abstract: The present invention is for a method of preparing purified .epsilon.-caprolactam from carpet waste containing nylon-6. Contaminated .epsilon.-caprolactam is obtained by depolymerizing nylon-6 from carpet waste. A mixture of the contaminated .epsilon.-caprolactam and water is then hydrogenated in the presence of hydrogen and a hydrogenation catalyst in order to produce purified .epsilon.-caprolactam. The amount of contaminated .epsilon.-caprolactam in the mixture can be between 10 and 95% by weight.
    Type: Grant
    Filed: June 2, 1994
    Date of Patent: September 17, 1996
    Assignee: DSM N.V.
    Inventors: Antoon H. T. Halderit, Martin Booij, Jan A. J. Hendrix, Yvonne H. Frentzen