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:
Aug. 21, 2007
Filed:
Apr. 06, 2006
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)wherein X is a bivalent organic bridging group; Rand Rare independently selected from, hydrocarbyl, substituted hydrocarbyl, heterohydrocarbyl and substituted heterohydrocarbyl groups, with the proviso that when Rand Rare aromatic groups they do not contain a polar substituent at any of the ortho-positions; Rand Rare independently selected from optionally substituted aromatic groups, each Rand Rbearing a polar substituent on at least one of the ortho-positions; and c) a second ligand having the general formula (II);(R)(R)P—X'—P(R)(R)  (II)