The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 03, 2008
Filed:
Jun. 28, 2007
Eric Johannes Maria DE Boer, Amsterdam, NL;
Harry Van Der Heijden, Amsterdam, NL;
Quoc an on, Amsterdam, NL;
Johan Paul Smit, Amsterdam, NL;
Arie Van Zon, Amsterdam, NL;
Eric Johannes Maria De Boer, Amsterdam, NL;
Harry Van Der Heijden, Amsterdam, NL;
Quoc An On, Amsterdam, NL;
Johan Paul Smit, Amsterdam, NL;
Arie Van Zon, Amsterdam, NL;
Shell Oil Company, Houston, TX (US);
Abstract
A catalyst precursor composition comprising a) a source of chromium, molybdenum or tungsten; b) a first ligand having the general formula (I):(R)(R)P-X-P(R)(R)  (I)where X is a bivalent organic bridging group, Rand Rare hydrocarbyl groups, and Rand Rare aromatic groups; and c) a second ligand having the general formula (II):(R)(R)P-X'-P(R)(R)  (II)where X′ is a bridging group containing nitrogen and R, R, Rand Rare hydrocarbyl groups. The present invention also relates to a catalyst system comprising the catalyst precursor composition of the present invention and a cocatalyst.