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"I watched his countenance closely, to see if he was not deranged ... and I was assured by other senators after he left the room that they had no confidence in it."
U.S. Senator Smith of Indiana ; After seeing Samuel Morse demonstrate the telegraph.
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| Number | Title | Issue Date |
| 5832334 | Color control system for electrographic printer A system for substantially maintaining color density in liquid toners for electrographic printers is disclosed. The system includes means for substantially continuously supplying toner concentrate to a printer and means for substantially continuously with... | 11/03/1998 |
| 5781828 | Liquid color mixing and replenishment system for an electrostatographic printing machine A system and method for color mixing management in an electrostatographic printing system, wherein a developing material reservoir containing an operative solution of colored developing material including a mixture of selected color components is continuo... | 07/14/1998 |
| 5737666 | Development control system Toning apparatus for toning an electrostatic latent image, having image and background portions at different potentials on an imaging surface. The apparatus comprises an endless toning surface coated with a layer of concentrated toner and engaging the ima... | 04/07/1998 |
| 5724629 | Liquid developer monitoring device, liquid developer controlling system, and image forming apparatus using same This invention relates to a liquid developer monitoring device comprising a first electrode which contacts with a liquid developer comprising a liquid medium and electrically charged toner particles dispersed therein, a second electrode being either a dev... | 03/03/1998 |
| 5722017 | Liquid developing material replenishment system and method A liquid developing material replenishment system wherein an apparatus for developing an electrostatic latent image with a liquid developing material includes a liquid developing reservoir for providing a supply of operative liquid developing material to ... | 02/24/1998 |
| 5713062 | Color mixing and control system for use in an electrostatographic printing machine A system and method for color mixing control in an electrostatographic printing system. An operative mixture of colored developing material is continuously replenished with selectively variable amounts of developing materials of basic color components mak... | 01/27/1998 |
| 5706095 | Apparatus and method for measuring percentage solids in liquid developer material A system for measuring a percentage of the solids in a liquid developer material is provided. The liquid developer material is received by a liquid developer material application member for application of the liquid developer material to a selected surfac... | 01/06/1998 |
| 5634170 | Method and apparatus for sensing and cleaning developer fluid A method and apparatus for filtering and sensing a developer fluid in a printing or copying machine for processing purposes. In order to insure that developer fluid reclaimed from a developing process is free from contamination, a filter/sensor system is ... | 05/27/1997 |
| 5623715 | Liquid toner concentrate management system and method An hydraulic cylinder (100) driven by a reciprocating motive force operates in conjunction with two check valves (170) and (200) to pump liquid toner concentrate (150) around a loop from a reservoir bottle (180) and back into the bottle (180). A microproc... | 04/22/1997 |
| 5598253 | Liquid developer apparatus and method using two different bias voltages for preventing fog in the background of an image A liquid developer apparatus comprises a developer unit for applying a liquid developer to an electrostatic latent image formed on a recording medium, and a switch circuit for selectively outputting to the developer unit one of a first bias voltage and a ... | 01/28/1997 |
| 5530529 | Fluid sensing aparatus A apparatus for sensing fluid parameters such as optical density, light transmittance, electrical conductivity and/or other characteristics of a fluid, including an emitter adapted to project a light beam and an electrical current and a detector adapted t... | 06/25/1996 |
| 5512978 | Replenishing system An apparatus for measuring concentrations of a first vapor pressure carrier fluid component and a second vapor, pressure carrier fluid component in a carrier fluid mixture, including a supply vessel for holding the carrier fluid mixture. A light source is... | 04/30/1996 |
| 5447056 | Toner concentration control system for liquid electrophotography An "L" shaped element having horizontal and vertical sections, is submerged in the liquid toner concentrate such that the horizontal section is totally submerged while the vertical section is submerged proportionally to an amount of the liquid toner conce... | 09/05/1995 |
| 5398104 | Passive toner concentration control system In an electrophotographic printer, an apparatus for supplying a liquid toner that has a solids concentration within a predefined range. A concentrated solids material and a carrier liquid is contained within a reservoir. The concentrated solids has a soli... | 03/14/1995 |
| 5369476 | Toner control system and method for electrographic printing Toner control system and method for an electrographic printer in which toner is delivered from a reservoir to a toner fountain and there applied to an electrostatically charged sheet to form an image. The visual quality of the image is monitored, and tone... | 11/29/1994 |
| 5278615 | Liquid toner imaging system A multi-color liquid toner electrophotographic apparatus includes an image bearing surface, a developing apparatus for developing an image on the image bearing surface using a plurality of liquid toners of different colors and a transferring apparatus for... | 01/11/1994 |
| 5243391 | Varying an electric field, during development of a latent electrostatic image with developer solution, in proportion to a sensed concentration of toner that is within the developer solution The separation between two plates or electrodes--between which plates a developer solution is applied to develop a latent electrostatic charge image on a photoconductive medium within an electrophotographic imager--is varied in proportion to a detected co... | 09/07/1993 |
| 5121164 | Method for maintaining a liquid composition A method for maintaining a preselected concentrations of first and second charge directors in a toner composition, where such composition is being subjected to a use in which initial concentrations of the first and second charge directors are being deplet... | 06/09/1992 |
| 4860924 | Liquid developer charge director control A copier wherein charge director is supplied to a liquid developer in response to a conductivity measurement thereof. Toner concentrate deficient in charge director is supplied to the liquid developer in response to an optical transmissivity measurement t... | 08/29/1989 |
| 4800839 | Developing device for electrophotographic color copier A device applicable to an electrophotographic color copier or a color ink jet printer for selectively supplying visualizing liquids of different colors, e.g. black, red, green and blue or a mixture thereof to a photoconductive drum, paper or like recordin... | 01/31/1989 |
| 4671309 | Device for controlling concentration of a liquid developing machine An apparatus for controlling concentration of a liquid developer in a machine using liquid developer has a developer device for developing an electrostatic latent image by a liquid developer, a tank for containing the liquid developer having an inlet and ... | 06/09/1987 |
| 4257347 | Process and apparatus for electrophotographic development of latent images on sheet-like carriers The intensity of development of latent images on dielectric receptor sheets in a liquid bath which contains a dispersion of toner particles and fills a vessel between two electrodes one of which supports a sheet in such a way that the latent image faces t... | 03/24/1981 |
| 4222497 | System and method for monitoring and maintaining a predetermined concentration of material in a fluid carrier A system and method for monitoring and maintaining a predetermined concentration of material in a fluid body or carrier includes a control arrangement for detecting the transmissivity of a flow cell in each of two states. One of the states during which th... | 09/16/1980 |
| 4204766 | Method and apparatus for controlling toner concentration of a liquid developer Method and apparatus for detecting and controlling the concentration of active toner particles in a liquid developer comprising taking a sample or proportion of liquid developer and subjecting it to an electrostatic field, measuring the toner particle con... | 05/27/1980 |
| 4166702 | Device for detecting a toner concentration in a developing solution A device for detecting toner concentration in a developing solution for developing an electrostatic image includes a casing having a small drainage hole formed at a top portion thereof so that a certain amount of a developing solution will always be prese... | 09/04/1979 |
| 4119989 | System for controlling concentration of developer solution A system for controlling the concentration of developer solution, which includes a toner concentrate and a carrier, to be substantially equal to a predetermined concentration. The system, which is used in conjunction with a photocopying apparatus, compris... | 10/10/1978 |
| 4008612 | Liquid quantity detecting device A liquid quantity detecting device comprises a liquid container, liquid circulating means disposed within the liquid container, and means for detecting bubbles created by the liquid circulating means when the liquid level has been lowered. Thus, decrease ... | 02/22/1977 |
| 3994257 | Developing device in an electrophotographic copying apparatus In an electrophotographic copying apparatus using developing liquid to develop an electrostatic latent image formed on the surface of an electrostatic image bearing member, a developing device comprises a developing liquid storage tank, a developing porti... | 11/30/1976 |
