Patents by Inventor Pieter M. van Dijk

Pieter M. van Dijk 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).

  • Removal of metal soaps from hydrogenated fatty products
    Patent number: 5135573
    Abstract: The invention provides a process for removing fatty acid metal soaps derived from metals with an atomic number from 27 to 29 from hydrogenated fatty products comprising separating solid metal precipitated under the influence of hydrogen at a pressure ranging between 0.05 and 10 MPa from the hydrogenated fatty products. Preferably the hydrogen pressure is between 0.2 and 5 MPa. Preferably the metal is nickel. It is recommended to effect the separation by filtration, using a filter comprising vertical pressure leaves. Also it is possible to treat the hydrogenated fatty product with hydrogen under a pressure between 0.05 and 10 MPa before separating the metal from the fatty product.
    Type: Grant
    Filed: November 23, 1990
    Date of Patent: August 4, 1992
    Assignee: Unilever Patent Holdings B.V.
    Inventors: Hendrikus J. van den Berg, Adelheid M. Deryck, Pieter M. van Dijk, Cornelis M. Lok, Johannes C. Oudejans
  • Catalytic preparation of carbonamides
    Patent number: 4655972
    Abstract: Carbonamides are prepared from carboxylic acids and ammonia in the presence of a catalytic amount of a hydrated oxide.Preferably a hydrated titanium-, zirconium- or tin oxide in an amount between 0.05 to 10% by weight is used. The hydrated oxide contains at least 4% of water.
    Type: Grant
    Filed: July 3, 1984
    Date of Patent: April 7, 1987
    Assignee: Internationale Octrooi Maatschappij "Octropa" B.V.
    Inventors: Teunis Eikelboom, John A. Rand, Pieter M. van Dijk