Zecotek Imaging Systems, a subsidiary of Zecotek Photonics, has started legal action in U.S. Federal District Court in Los Angeles against defendants Saint-Gobain and Philips Healthcare for infringement of Zecoteks U.S. Patent Number 7,132,060, which covers the substances and chemical formulations used to grow lutetium fine silicate scintillation crystals, typically used in imaging devices.