A process cartridge detachably mountable to a main assembly of an image forming apparatus includes a cartridge frame, an electrophotographic photosensitive member, a processor actable on the electrophotographic photosensitive member, and a cartridge shutter capable of taking a closing position for covering...http://www.google.com.au/patents/US6002896?utm_source=gb-gplus-sharePatent US6002896 - Process cartridge and electrophotographic image forming apparatus
