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| Number | Title | Issue Date |
| 5272503 | Replaceable sub-assemblies for electrostatographic reproducing machines A printing machine, having operating parameters associated therewith, for producing prints is provided. The printing machine includes a controller for controlling the operating parameters and an operator replaceable sub-assembly adapted to serve as a proc... | 12/21/1993 |
| 5262824 | Image formimg apparatus with automatic process cartridge displacement for maintenance An image forming apparatus provided with a process cartridge which contains at least an image carrying body fixed therein. The process cartridge is slidably provided to a main frame of the apparatus and is adapted to occupy two positions of a first positi... | 11/16/1993 |
| 5220379 | Color image forming apparatus An image forming apparatus in which a process cartridge contains at least an image carrying member, a developing unit and a developer replenishment unit. The process cartridge can be mounted to or removed from the apparatus for its replacement. The proces... | 06/15/1993 |
| 5155527 | Changeable process cartridge used in an image forming apparatus having a useable life determining means The end of the operational life of a changeable process cartridge, including a developing device, is determined based on either the average particle size of the toner of a two component developing agent stored in the developing device or the number of pri... | 10/13/1992 |
| 5051778 | Electrophotographic copying machine which integrates components having substantially equal service lives into respective detachable units formed of a developing unit, a photoreceptor unit and a toner cartridge unit An electrophotographic apparatus has its electrophotographic component parts divided into three units consisting essentially of a developing unit A, a photoreceptor unit B and a toner cartridge unit C. Each of the units is capable of being detached from a... | 09/24/1991 |
| 5021828 | Copying apparatus having a consumable part A storage apparatus such as a copier or facsimile machine which stores information on paper and uses parts which the operator replaces upon expiration because of consumption of the part or deterioration of the part. A system is provided so that the consum... | 06/04/1991 |
| 4961088 | Monitor/warranty system for electrostatographic reproducing machines using replaceable cartridges A monitor/warranty system for electrostatographic reproducing machines in which replaceable cartridges providing a predetermined number of images are used, each cartridge having an EEPROM programmed with a cartridge identification number that when matched... | 10/02/1990 |
| 4873549 | Device for detecting the life of an image forming process unit, opening of a seal of the unit and attachment of the unit to an image forming apparatus A device for detecting the life of a process unit which is detachably mounted in an image forming apparatus includes a sensor for detecting the density of the toner in the developing device and a signal detector receiving an output from the sensor and ope... | 10/10/1989 |
| 4774544 | Counter apparatus for an image forming apparatus for counting and managing the number of image forming operations In a counter apparatus for an image forming apparatus according to the present invention, which counts and manages the number of image forming operations, data which is ultimately written is retrieved from data stored in an EEPROM, and the retrieved data ... | 09/27/1988 |
| 4771313 | Service life indicator for a process cartridge A service life indicator for an image forming process cartridge which contains a consumable used for image formation and is detachably mountable into a main assembly for the image formation, comprises a switching device, adapted to be provided in the proc... | 09/13/1988 |
| 4751484 | Drum unit exchange time indicating device for image forming apparatus A drum unit exchange time indicating device for image forming apparatus comprises, an integrated signal output means to give output of integrated signal added up according to the time of use of the drum unit, a life signal output means to give output of d... | 06/14/1988 |
| 4707748 | Image recording apparatus An image recording apparatus. A disposable part is detachably mounted therein. The apparatus includes a photosensitive member which is imagewisely exposed to a dots of beam in accordance with the signal of the image to be recorded. A counter counts clockp... | 11/17/1987 |
