On June 30 2010, the Taiwan IP Court delivered a first instance ruling on a patent infringement lawsuit filed by Dr G F Neumark Rothschild (professor emeritus of Columbia University) against two Taiwanese LED suppliers. The lawsuit was dismissed on the grounds that the based-upon Taiwanese invention patent number 41070, entitled, Process for Doping Crystals of Wide Band Gap Semiconductors (corresponding to US patent 4,904,618), was anticipated by a paper published in the May 1969 issue of Physical Review by Crowder et al entitled, "EPR and Luminescence Studies of Er+3 in Acceptor-Doped ZnTe". On the basis of a number of prior art references submitted by the defendants, the court ruled that Rothschild's patent should be deemed invalid.