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| Number | Title | Issue Date |
| 4618248 | Test patch generation utilizing system scan optics An electrophotographic printing machine utilizing an optical illumination and scanning system which, besides performing the conventional document reproducing function, is adapted to operate in a machine test mode. In the test mode, target strips of varyin... | 10/21/1986 |
| 4568173 | Image forming apparatus There is provided a copying machine in which a copying magnification and a copying density are variable. When the operation mode is set in the check mode and a copying start key is depressed, a document is copied once at a predetermined copying magnificat... | 02/04/1986 |
| 4551005 | Method of forming images of sensor patterns in effecting image density control of electrophotographic copying apparatus Forming a visible image of a sensor pattern on a photosensitive member for use in controlling image density of copies, wherein the sensor pattern of a reference density is placed substantially flush with a surface on which a document to be copied is place... | 11/05/1985 |
| 4536079 | Servicing system for reproduction machines To facilitate servicing of xerographic type reproduction machines or printers, diagnostic routines are used (1) to operate the machine in a predetermined copy run while recording the clock count on a global counter on the arrival of a copy sheet at a firs... | 08/20/1985 |
| 4531827 | Method and apparatus for improved retention copying A method of producing multiple copies of an original document with a minimum number of document imaging scannings includes impressing an electrostatic image of a reference density patch on the charge receptor together with an image of the document, detect... | 07/30/1985 |
| 4377338 | Method and apparatus for copier quality monitoring and control Data correlated to the light reflectance of a maximum toned area and a minimum toned area is recorded to establish standards for monitoring and controlling subsequent copier operation. A test pattern is imaged onto the photoconductor by controlled illumin... | 03/22/1983 |
| 4183657 | Dynamic reference for an image quality control system A system for checking copy quality variables within the image area of an electrophotographic machine. During a test cycle, quality is checked by producing sample test areas within the photoconductor image area ordinarily used for producing copies. Reflect... | 01/15/1980 |
