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. 08, 2016
Filed:
Aug. 28, 2013
Yara International Asa, Oslo, NO;
Francois Ledoux, Cormeilles en Parisis, FR;
YARA INTERNATIONAL ASA, Oslo, NO;
Abstract
The invention concerns a method of producing passivated urea or urea based compounds for fertilizer blends wherein the urea particles are treated with a mineral acid that reacts with urea and creates a grasping layer. Thereafter a solid base in powder form is added in excess to the particles to coat the acidified particle surface. The invention also concerns a fertilizer blend comprising the passivated urea or urea based compounds with one or more of AN or AN-based compound, NS products, superphosphates, and more generally with a priori most compounds that urea is susceptible to react with when in direct contact. A safe blend comprises more than 40 weight % of the passivated urea.