Patents by Inventor Wilhelmina Cornelia Verhoef-Van Wijk

Wilhelmina Cornelia Verhoef-Van Wijk 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).

  • Ligands and catalyst systems thereof for ethylene oligomerisation to linear alpha olefins
    Patent number: 7304159
    Abstract: Mixed bis-imine pyridine ligands of formula (I), wherein Z1, which is different from Z2, is an optionally substituted aryl group; and Z2 comprises an optionally substituted heterohydrocarbyl moiety, or an optionally substituted aryl group in combination with a metal, said optionally substituted aryl group being ?-co-ordinated to the metal; mixed bis-imine pyridine complexes comprising a ligand of formula (I); mixed ionic bis-imine pyridine complexes comprising a ligand of formula (I); and processes for the production of alpha olefins from ethylene, using said complexes.
    Type: Grant
    Filed: March 15, 2005
    Date of Patent: December 4, 2007
    Assignee: Shell Oil Company
    Inventors: Eric Johannes Maria De Boer, Harry Van Der Heijden, Wilhelmina Cornelia Verhoef-Van Wijk, Arie Van Zon
  • Ligands and catalyst systems thereof for ethylene oligomerisation to linear alpha olefins
    Publication number: 20030119921
    Abstract: Mixed bis-imine pyridine ligands of formula (I), wherein Z1, which is different from Z2, is an optionally substituted aryl group; and Z2 comprises an optionally substituted heterohydrocarbyl moiety, or an optionally substituted aryl group in combination with a metal, said optionally substituted aryl group being &pgr;-co-ordinated to the metal; 1
    Type: Application
    Filed: July 30, 2002
    Publication date: June 26, 2003
    Inventors: Eric Johannes Maria De Boer, Harry Van Der Heijden, Wilhelmina Cornelia Verhoef-Van Wijk, Arie Van Zon