“A patentee seeking to rely on commercial success as an indicator of non-obviousness in order to rebut an allegation of its patent being obvious over prior art had to establish that the commercial success relied on was due to his invention and not to other market factors. Where a number of other factors might have explained the success, unless he could show they were irrelevant or largely so, he would not have proved what he needed to rebut the allegation. The evidential onus of proof was on him, and the party making the allegation was not required to show that the commercial success was due to other factors.”
WLR Daily, 21st May 2009
Please note once a case has been fully reported in one of the ICLR series the corresponding WLR Daily summary is removed.