There has today been an escalation of the patent war between Kodak and Sony, in what looks like a tit for tat response, Sony has filed a suit against Kodak alleging that they infringed 10 of Sony's patents related to digital cameras. "It's a very important technology resource for Sony and we feel that if any company is in infringement of them, we will take action," said Sony spokesman Gerald Cavanagh in Tokyo. Sony's latest suit involves patents related to electronic shutters for CCD's. Sony said its action was not a counter-suit and involved different patents than the suit filed by Kodak.