Patents by Inventor Reinder Sietze Hamstra

Reinder Sietze Hamstra 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).

  • Method for the preparation of feed pellets
    Patent number: 6555148
    Abstract: The present invention discloses a method for obtaining feed pellets. The method includes the addition of active ingredients to feed pellets after the pellets have been extruded. The method further includes the addition of a solution or suspension of the desired feed or ingredient in a water or oil phase to the pellets under reduced pressure and subsequently increasing the pressure. The method results in pellets with a high degree of loading and in which the active ingredients are homogeneously distributed.
    Type: Grant
    Filed: May 4, 2000
    Date of Patent: April 29, 2003
    Assignee: DSM N.V.
    Inventors: Reinder Sietze Hamstra, Augustinus Franciscus Tromp
  • Method for the preparation of feed pellets
    Patent number: 6083541
    Abstract: The present invention discloses a method for obtaining feed pellets. The method includes the addition of active ingredients to feed pellets after the pellets have been extruded. The method further includes the addition of a solution or suspension of the desired feed or ingredient in a water or oil phase to the pellets under reduced pressure and subsequently increasing the pressure. The method results in pellets with a high degree of loading and in which the active ingredients are homogeneously distributed.
    Type: Grant
    Filed: February 9, 1998
    Date of Patent: July 4, 2000
    Assignee: DSM N.V.
    Inventors: Reinder Sietze Hamstra, Augustinus Franciscus Tromp
  • Process for the fractioning and recovery of valuable compounds from vinasse produced in fermentations
    Patent number: 5760078
    Abstract: A process is provided for the preparation of valuable products from vinasse which contains potassium salts. The process comprises concentrating the vinasse to a dry matter content of 50-80% dry solids and separating the formed crystals in a concentration step to form a supernatant which is free of potassium salts. Ammonium sulphate is added to the vinasse before or during concentrating the vinasse.Furthermore, clarification of the supernatant is carried out to provide for the separation of betaine, PCA, succinic acid or citric acid. Filtration, or microfiltration is used for the clarification and a chromatographic separation is used for the separation of betaine as well as the other products. Potassium salts are obtained from the crystals to provide for a fertilizer.
    Type: Grant
    Filed: April 3, 1996
    Date of Patent: June 2, 1998
    Assignee: Gist-Brocades B.V.
    Inventors: Reinder Sietze Hamstra, Peter Johannes Schoppink
  • Method for the preparation of feed pellets
    Patent number: 5716655
    Abstract: The present invention discloses a method for obtaining feed pellets. The method comprises the addition of active ingredients to feed pellets after the pellets have been extruded. The method further comprises the addition of a solution or suspension of the desired feed or ingredient in a water or oil phase to the pellets under reduced pressure and subsequently increasing the pressure. The method results in pellets with a high degree of loading and in which the active ingredients are homogeneously distributed.
    Type: Grant
    Filed: October 20, 1993
    Date of Patent: February 10, 1998
    Assignee: Gist-Brocades B.V.
    Inventors: Reinder Sietze Hamstra, Augustinus Franciscus Tromp