Patents by Inventor Jan Wiersma

Jan Wiersma 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).

  • Patent number: 7105706
    Abstract: Process for the preparation of an alkoxylated alcohol composition comprising one or more alkoxylated alcohols wherein the process comprises the steps of: (a) reacting carbon monoxide with hydrogen under Fischer-Tropsch reaction conditions in the presence of a Fischer-Tropsch catalyst; (b) separating from the product of step (a) at least one hydrocarbon fraction comprising paraffins having from 9 to 17 carbon atoms and olefins having from 9 to 17 carbon atoms, the hydrocarbon fraction additionally comprising at least a portion of alcohols; (c) contacting one or more of the hydrocarbon fractions obtained in step (b) with an alkylene oxide; and (d) recovering an alkoxylated alcohol composition from the reaction product of step (c).
    Type: Grant
    Filed: December 9, 2004
    Date of Patent: September 12, 2006
    Assignee: Shell Oil Company
    Inventors: Hendrik Dirkzwager, Laurent Alain Fenouil, Rendert Jan Wiersma
  • Patent number: 5865260
    Abstract: A facility or platform (11) having a limited number of circular well-drilling slots (3) is converted to provide additional well-drilling locations on the platform (11) while protecting the platform (11) from the hoisting and lowering loads normally required to drill deep water wells. The additional well-drilling locations are provided by placing multiple wells in individual slots (3). Load protection is accomplished by transferring such loads to a underwater competent earth formation (15) with a thick-walled shroud (12). The shroud (12) surrounding the multiple wells carries at minimum by a plurality of internal centers through which the wells pass for assuring separation of the multiple wells and transmitting loads to the shroud (12).
    Type: Grant
    Filed: December 18, 1996
    Date of Patent: February 2, 1999
    Assignee: Chevron U.S.A. Inc.
    Inventors: John R. Jackson, Noel S. Avocato, Alan Leiper, Jan Wiersma