Patents by Inventor Sikke J. A. Boelema

Sikke J. A. Boelema 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 hydrocarbons from carbon-containing material
    Patent number: 4433065
    Abstract: Pulverized coal is converted by means of a gaseous mixture and partial oxidation into synthesis gas which is subsequently utilized as a feedstock for the production of hydrocarbons. A gaseous mixture containing non-converted synthesis gas and low boiling hydrocarbons is separated from the higher boiling hydrocarbons and recycled to the coal conversion step.
    Type: Grant
    Filed: March 5, 1982
    Date of Patent: February 21, 1984
    Assignee: Shell Oil Company
    Inventors: Maarten J. van der Burgt, Sikke J. A. Boelema, Willem J. A. H. Schoeber, Pieter L. Zuideveld