According to the US Patent & Trademark Office, the invention relates to a “hoisting crane with an even reeving system having a substantially hollow vertical column, which has a foot, a top and a body disposed between the foot and the top. An annular bearing structure disposed around the substantially hollow vertical column, a jib connection member disposed on the annular bearing structure and rotatable about the substantially hollow vertical column. A jib connected to the jib connection member.”

The inventors were issued US Patent Number 7,328,811 on February 12 2008.

The patent has been assigned to ITREC BV, Schiedam.

The original application was filed on December 18 2006.