Patents by Inventor Henricus Franciscus Wilhelmus

Henricus Franciscus Wilhelmus 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 the preparation of ?-caprolactam
    Patent number: 6841666
    Abstract: The invention relates to a process for the preparation ?-caprolactam starting from 6-aminocapronitrile by hydrolysis/oligomerisation followed by de-oligomerisation/cyclisation using superheated steam characterized in that the hydrolysis/oligomerisation is performed with superheated steam converting 6-aminocapronitrile into a molten phase and a gas phase comprising ammonia, ammonia is continuously separated off and the de-oligomerisation/cyclisation is performed by treating the molten phase further with superheated steam.
    Type: Grant
    Filed: March 22, 2002
    Date of Patent: January 11, 2005
    Assignee: DSM IP Assets B.V.
    Inventors: Wim Buijs, Henricus Franciscus Wilhelmus Wolters
  • Process for the preparation of $g(e)-caprolactam
    Publication number: 20040132999
    Abstract: The invention relates to a process for the preparation of &egr;-caprolactam starting from 6-aminocapronitrile by hydrolysis/oligomerisation followed by de-oligomerisation/cyclisation using superheated steam characterized in that the hydrolysis/oligomerisation is performed with superheated steam converting 6-aminocapronitrile into a molten phase and a gas phase comprising ammonia, ammonia is continuously separated off and the de-oligomerisation/cyclisation is performed by treating the molten phase further with superheated steam.
    Type: Application
    Filed: February 27, 2004
    Publication date: July 8, 2004
    Inventors: Wim Buijs, Henricus Franciscus Wilhelmus