Patents by Inventor Ludovicus H. W. Janssen

Ludovicus H. W. Janssen 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 an alkanone and/or alkanol
    Patent number: 5298665
    Abstract: The invention relates to a process for preparing an alkanone and/or alkanol by oxidizing an alkane with 3-30 C-atoms, using oxygen, to form an alkyl hydroperoxide, followed by a decomposition of the resulting alkyl hydroperoxide in the presence of a metal compound immobilized on a carrier, which carrier carries aliphatic or aromatic amine groups or sulphide groups. The process is preferably applied to cycloalkanes.
    Type: Grant
    Filed: March 15, 1993
    Date of Patent: March 29, 1994
    Assignee: DSM N.V.
    Inventors: Ludovicus H. W. Janssen, Peter Hoogendoorn, Ubaldus F. Kragten, Henricus A. C. Baur
  • Process for the preparation of benzaldehyde in the gas phase
    Patent number: 4987265
    Abstract: The invention relates to the preparation of a benzaldehyde by hydrogenation of a corresponding benzoic acid in the gas phase in the presence of a manganese containing catalyst on an acid carrier. The invention is characterized in that use is made of a catalyst prepared by:(a) coprecipitation, at a pH between 7 and 10, of a manganese salt and a salt from which an acid carrier is formed,(b) subsequent calcination at a temperature between 300.degree. and 700.degree. C.,(c) followed by reduction with a hydrogen containing gas mixture.Preferably the catalyst contains oxides of aluminum, zirconium, titanium, hafnium and/or niobium.
    Type: Grant
    Filed: May 6, 1988
    Date of Patent: January 22, 1991
    Assignee: Stamicarbon B. V.
    Inventors: Paul C. Van Geem, Ludovicus H. W. Janssen
  • Process for the preparation of alkylbenzenes
    Patent number: 4308413
    Abstract: A method for the preparation of an alkyl benzene by dehydrogenation of the corresponding alkenyl cyclohexene in the presence of carrier borne noble metal catalyst wherein a non-acidic material is used as the catalyst carrier and the reaction is initially conducted at a lower temperature for a period of time and subsequently at a higher temperature.
    Type: Grant
    Filed: July 7, 1980
    Date of Patent: December 29, 1981
    Assignee: Stamicarbon, B.V.
    Inventors: Theodorus F. M. de Graaf, Ludovicus H. W. Janssen