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| Number | Title | Issue Date |
| 4227795 | Half-tone imaging system An optical system in which a movable photosensitive member is exposed to a light image of an original document. The optical system includes a light source which illuminates a screen having at least two adjacent spaced rows of opaque dots. Movement of the ... | 10/14/1980 |
| 4188213 | Color corrected printing system A color process in which color copies of an original document containing color information are reproduced. In this process, successive single color electrostatic latent images are recorded on an image bearing member. Each successive single color electrost... | 02/12/1980 |
| 4174171 | Belt tracking system An apparatus in which the lateral alignment of a belt arranged to move in a pre-determined path is controlled. A support mounted resiliently constrains lateral movement of the belt causing the belt to apply a moment to a pivotably mounted steering post. A... | 11/13/1979 |
| 4121261 | Synchronous helical scan-helical record magnetic imaging An electronically controlled magnetic recorder for rapidly optically scanning an original document and for producing a latent magnetic image thereof. The recorder comprises directly coupled helical optical scanning and helical magnetic writing.... | 10/17/1978 |
| 4080652 | Data processing system A memory control processor adapted to expand a random access or accelerator memory by logical overlays which performs these overlays into memory fields (pages) on the basis of page usage history. To provide a quick reference to page use a chronological se... | 03/21/1978 |
| 4080633 | Twisting geometry scanner An optical flying spot scanner having a lens array positioned between a scan line and a detector array and inclined at an angle to the axis of the scan line. Each of the lenses of the lens array has a coordinate position in a plane parallel to the scan li... | 03/21/1978 |
| 4052207 | Electrostatographic imaging process A novel yellow electrostatographic colorant is disclosed. This colorant may be employed as an electrostatographic toner or developer material. Electrophotographic processes are disclosed employing this colorant. When employed as an electrophotographic dev... | 10/04/1977 |
| 4043052 | Method and apparatus for fixing toner images A toner image carried upon a substrate is fixed by placing the toner image in close juxtaposition to an absorbent web carrying a volatile toner solvent. The toner particles are softened and caused to adhere to the substrate by the action of the vapors ema... | 08/23/1977 |
| 4024834 | Temperature compensated doctor blade A temperature compensated doctor blade system is disclosed for controlling the amount of liquid on a substrate. Variation in temperature is found to cause wide variation in liquid viscosity which affects doctor blade pressure requirements. An expandable c... | 05/24/1977 |
| 4013572 | Hybrid fix system incorporating photodegradable polymers A novel toner system is provided employing a photodegradable toner. These toners are photodegradable during the fixing step in electrophotographic processes when they are exposed to light and then pressure or in the opposite sequences. This system provide... | 03/22/1977 |
| 4005940 | Optical system alignment apparatus An apparatus in which the alignment of an optical system is displayed, thereby enabling misalignments therein to be corrected. The alignment apparatus, in conjunction with the optical system, generates a narrow sample light image. This sample light image ... | 02/01/1977 |
| 4003649 | Electrophotographic halftone printing machine employing a phase screen Apparatus for optically imaging a halftone pattern on a xerographic photoreceptor to produce color copies of a color original. The apparatus includes a phase screen for providing a predetermined halftone pattern, the screen producing substantially the sam... | 01/18/1977 |
| 4000394 | Fuser thermal detector An apparatus in which heat settable particles are affixed substantially permanently to a sheet. The apparatus includes a heated fuser member cooperating with a backup member to define a nip through which the sheet passes. A detector is in contact with the... | 12/28/1976 |
| 3998539 | Illumination system An electrophotographic copying machine having a moving photoconductive member, in which an original document is illuminated by a pair of light sources, which are energized alternately to illuminate the document at a frequency of 240 hertz. This frequency ... | 12/21/1976 |
| 3998184 | Development apparatus A developer unit in which buckets in a cylindrical member advance particles from a first region to a second region. The particles are moved from the second region to a latent image rendering it visible. The foregoing abstract is neither intended to define the ... | 12/21/1976 |
| 3997265 | Platen cover A cover arranged to hold an original document in the platen of an electrophotographic printing machine. The cover includes an outer member defining a chamber with an inner member being mounted therein. The outer member cooperates with the platen to form a... | 12/14/1976 |
| 3994579 | Transfer system for electrophotographic printing An apparatus in which charged particles are transferred from a support surface to a sheet of support material secured to a transfer member. The apparatus includes an electrically biased plate member positioned between the support surface and transfer memb... | 11/30/1976 |
| 3992108 | Optical system alignment apparatus An apparatus in which the alignment of an optical system is displayed, thereby enabling misalignments therein to be corrected. The alignment apparatus, in conjunction with the optical system, generates a narrow sample light image. This sample light image ... | 11/16/1976 |
| 3991713 | Development apparatus for an electrostatographic printing machine An apparatus which develops an electrostatic latent image with electrostatically charged particles. The apparatus produces a magnetic field which forms a brush-like array of charged particles. A development electrode is operatively associated with the mag... | 11/16/1976 |
| 3981577 | Optical system for an electrophotographic printing machine An optical system in which the non-linearities in a light image are corrected. The optical system includes an opaque, movable belt having a plurality of slits therein. Each slit is of a different area with the width thereof increasing from the central reg... | 09/21/1976 |
| 3979022 | Monitoring device A device in which the quantity of particles stored in a container is monitored. The device is arranged to indicate when the supply of particles is beneath a predetermined level. A shaft member positioned in the particle storage container is rotated from a... | 09/07/1976 |
| 3973699 | Liquid dispensing apparatus utilizing double acting piston A development system for use in electrostatographic automatic imaging machines is described. The system includes an apparatus comprising a cartridge having a tubular housing with a piston slideably mounted in the housing defining a set of chambers and mea... | 08/10/1976 |
| 3970382 | Spatially selective optical system An optical system in which a light image of an original document is filtered to form a single color light image which is transmitted through a photochromic filter. The photochromic filter is responsive to the intensity of the single color light image to a... | 07/20/1976 |
| 3967895 | Illumination control system An apparatus which regulates the duration of time a surface is illuminated. A document is illuminated and the light rays transmitted therefrom are formed into a light image which is projected onto the surface. The duration of time that the light image exp... | 07/06/1976 |
| 3967893 | Illuminating apparatus An apparatus in which a charged photoconductive member is exposed to a light image of an original document. An array of solid state light emitters are employed to illuminate the original document. The light image of the original document is projected onto... | 07/06/1976 |
| 3967892 | Development system An apparatus in which an electrostatic latent image is developed with electrostatically charged particles. A brush-like array of charged particles is positioned closely adjacent to the electrostatic latent image. A portion of the charged particles are sep... | 07/06/1976 |
| 3967894 | Screened optical system An optical system in which a continuous tone light image of an original document is formed. The optical system is arranged to illuminate the original document and to create a finely divided uniformly distributed light image. A selectable feature therein p... | 07/06/1976 |
| 3965862 | Xerographic development system An apparatus for developing a latent image on a charged photosensitive surface of a xerography printing machine has a magnetic brush assembly including a donor roll and a cleaning electrode adjacent to the roll for reducing the accumulation of toner parti... | 06/29/1976 |
| 3963342 | Curved screen An electrophotographic printing machine in which an arcuate screen member has a curvature substantially equal to the curvature of an arcuate photoconductive member employed therein. The centers of curvature of the screen member and photoconductive member ... | 06/15/1976 |
| 3963341 | Color electrophotographic printing machine An electrophotographic printing machine in which successive colored filtered light images expose a photoconductive member recording successive charge patterns thereon. Each charge pattern is developed with single color magnetic particles forming successiv... | 06/15/1976 |
| 3960445 | Color highlighting electrophotographic printing machine An electrostatographic printing machine in which a plurality of original documents are employed to create successive powder images which are transferred to a common sheet of support material. The sheet of support material is advanced along one of a plural... | 06/01/1976 |
| 3960444 | Electrophotographic printing machine An electrophotographic printing machine and method of use therefor in which a plurality of light images of the same original document are formed. Each of the light images is of a different predetermined magnitude and irradiates a charged photoconductive m... | 06/01/1976 |
| 3958989 | Transparency support material for electrophotographic process A sheet of support material in which a non-fibrous image receiving portion has a fibrous portion secured thereto. The fibrous portion cooperates with a sheet feeding apparatus to facilitate the seriatim feeding of successive sheets of support material fro... | 05/25/1976 |
| 3958877 | Half-tone screen with cleaning means for an electrophotographic printing machine An electrophotographic printing machine in which a screen moves from an inoperative position remote from a photoconductive member employed therein to an operative position closely adjacent thereto. As the screen moves from the operative position to the in... | 05/25/1976 |
| 3957367 | Color elastrostatographic printing machine A color electrostatographic printing machine in which successive single color powder images are transferred, in superimposed registration with one another, to an intermediary. This multi-layered powder image is fused on the intermediary and transferred th... | 05/18/1976 |
| 3955916 | Fuser roll sheet stripping apparatus An apparatus in which a sheet of support material having particles substantially permanently affixed thereto is separated from a heated fuser member. The heated fuser member is operatively associated with a back up member such that the sheet of support ma... | 05/11/1976 |
| 3946172 | Latching apparatus A latching apparatus including a housing having an aperture therein for receiving a key. Insertion of the key into the housing aperture rotates an actuating member from an open position to a closed position.... | 03/23/1976 |
| 3945728 | Alarm for an electrophotographic printing machine An apparatus in which the failure to remove an original document from a housing after the elapse of a preselected duration of time is detected.... | 03/23/1976 |
| 3944356 | Charging apparatus An apparatus adapted to charge an image bearing member to a substantially uniform potential. The apparatus controls the area of the surface charged on the image bearing member so that it corresponds substantially in size to that of a sheet of support mate... | 03/16/1976 |
| 3941085 | Release material applicator An apparatus in which release material is applied to a heated fuser member. A back up member is in communication with the fuser member and a sheet of support material having particles thereon passes therebetween. The particles on the sheet of support mate... | 03/02/1976 |
