Patent 7390345 was granted and assigned to Höganäs AB on June, 2008 by the United States Patent and Trademark Office.
The invention concerns a powder metallurgical composition comprising a major amount of an iron-based metal powder and a minor amount of carbon black. The amount of carbon black is between 0.001 and 0.2% by weight, preferably between 0.01 to 0.1% by weight.