Canon today announced the filing of two patent infringement complaints in Brazil against local companies for infringement of Brazilian Patent Nos. PI 0720506-6 and PI 0807733-9 relating, respectively, to an “electro photographic drum unit, processing cartridge and device for producing electro photographic images” and to a “developing device and device for producing electro photographic images for forming an image on a recording medium” by, inter alia, the offering and sale of certain toner cartridges for use in various models of Hewlett-Packard laser beam printers.