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:
Nov. 26, 2013
Filed:
May. 15, 2009
David William Johnson, Redcar, GB;
Trevor Huw Morris, Redcar, GB;
David William Johnson, Redcar, GB;
Trevor Huw Morris, Redcar, GB;
Abstract
A production process for the manufacture of ethylenically unsaturated acids or esters thereof is described. The process includes the steps of reaction of an alkanoic acid, or ester of an alkanoic acid, of the formula R—CH—COOR4 where Rand Rare each independently hydrogen or an alkyl group, in the presence of a catalyst system to produce an ethylenically unsaturated acid or ester product. The process is characterised in that the acid or ester product is subsequently contacted with a dienophile to thereby remove discolouration therefrom. An ethylenically unsaturated acid or ester crude product purification process is also described.