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| Number | Title | Issue Date |
| 4312589 | Charge density control for an electrostatic copier An electrophotographic copier having a toner concentration control apparatus which periodically effects a toner-patch test cycle during which the optical density of toner deposited on a photoconductor test area is measured, as by light reflectance. A time... | 01/26/1982 |
| 4310238 | Electrostatic copying apparatus First and second sensors (37), (39) are provided in a developing tank (36) containing a liquid developer consisting of a liquid carrier or dispersant and toner particles dispersed in the carrier. The first sensor (37) measures the electrical resistivity o... | 01/12/1982 |
| 4273843 | Method of detecting toner concentration in electrophotographic copying machine An apparatus and method for detecting the concentration of toner in a multi-component developer of an electrophotographic copying machine utilizes a source of illumination for projecting light onto the developer, and a receiving element for measuring the ... | 06/16/1981 |
| 4236486 | Toner concentration control device A toner concentration control device comprises a toner supply mechanism for supplying a toner to a developing device, a probe for picking up the toner in the developing agent after development is effected and a control mechanism for controlling the toner ... | 12/02/1980 |
| 4195260 | Apparatus for sensing deterioration of developing substance including ferromagnetic carrier and non-magnetic toner particles Deterioration of a dry developing substance causes toner particles to be so strongly adhered to carrier particles that they cannot be readily separated therefrom. The present apparatus comprises means for applying a predetermined electrostatic or air suct... | 03/25/1980 |
| 4155652 | Developer sensing system and control A system is disclosed which will sense the image-development state of toner in the development subsystem of an electrophotographic copier apparatus. This image-development state is related to both toner concentration and the charge-to-mass ratio (q/m) exi... | 05/22/1979 |
| 4141645 | Toner concentration monitor Apparatus for monitoring the concentration of toner particles in an electrographic developer mixture having toner and carrier particles in which a first signal is produced representative of the reflectivity of the developer mixture and an offset signal is... | 02/27/1979 |
| 4112870 | Apparatus for developing electrostatic charge images An apparatus for developing electrostatic charge images on a moving support, e.g. on a photoconductive belt, by a developing powder composed of toner particles and magnetizable carrier particles, which powder is transported by a rotating magnetic roller f... | 09/12/1978 |
| 4111151 | Multi-particle developability regulating system An apparatus in which the developability of a development system comprising a mixture of particles having at least two different colors is regulated. The quantity of each of the differently colored particles is maintained at a pre-scribed level to form a ... | 09/05/1978 |
| 4108545 | Developer supply control system in a copier A copier of the type which includes a photoreceptor on which an electrostatic latent image may be formed, a movable applicator which carries developer from a working supply of image developer and applies it to the image, and developer dispensing instrumen... | 08/22/1978 |
| 4064833 | Toner density controller A toner density controller for determining the density of a development material in a magnetic brush assembly of an electrostatic copier is disclosed. Means is provided for imposing a charge on the toner density controller which is opposite in charge to t... | 12/27/1977 |
| 4043293 | Developability regulating apparatus An apparatus which regulates the developability characteristics of a development system employing a developer mixture comprising at least carrier granules and toner particles. A transparent electrode attracts toner particles from the carrier granules. Lig... | 08/23/1977 |
| 3943886 | Developing apparatus for electrostatic charge images An improved apparatus is provided for developing an electrostatic charge image on a support being moved through a magnetic brush-forming field between a permanent magnet and a rotating cylinder that transports a powder mixture of toner particles and magne... | 03/16/1976 |
