http://www.freshpatents.com/Chemistry--physical-processes-dtnewntc023.php USPTO Class 023 - Chemistry: physical processes en-us Tue, 18 Dec 2007 18:46:44 -0800 1000 Wednesday Thursday Friday Saturday Sunday 141 31 http://www.freshpatents.com/index.php?rss=true http://www.freshpatents.com/images/freshpatentsnav_rss.gif http://www.freshpatents.com/Process-for-separating-zirconium-and-hafnium-dt20071213ptan20070283536.php Tue, 18 Dec 2007 18:46:44 -0800 The present invention provides a new process for separating zirconium and hafnium compounds, in particular to remove traces of zirconium compounds from hafnium compounds, using fractional crystallisation, as well as hafnium compounds obtainable in accordance with this process....