Agfa-gevaert Ag

Klaus Hoffmann

Rudolf Meyer

Hans Ohlschlager

Detlef Doppner

Silver halide emulsions are prepared by precipitation, transfer of the silver halide emulsion from the precipitation chamber into a separate circuit comprising a cleaning stage for the removal of dispersion medium and compounds soluble therein and exit into a collecting vessel.

Process and an apparatus for the production of photographic silver

The invention relates to an ink jet printer comprising at least one nozzle from which ink is adapted to issue under high pressure in the form of fine droplets, a charging apparatus for charging the droplets, a deflector unit, a collecting apparatus provided with a knife edge for collecting and discharging droplets of a specific charge, and a recording support arranged downstream of the movable knife edge wherein the collecting apparatus is provided with a cleaning device and an extraction device which are such that a new or freshly cleaned part of the knife edge always faces droplets being separated.

Ink jet printer

Non-aqueous inks having an electric conductivity of at least 10.sup.-4 Ohm.sup.-1 cm.sup.-1, a viscosity of at most 5 cP at 20.degree. C. and in which the liquid medium consists completely or predominantly of one or more solvents having each an evaporation index of less than 11 are most useful for the ink-jet recording process in which a jet of ink is ejected from a nozzle by application of pressure and after its breaking up into droplets is modulated according to the information to be recorded. Such inks are particularly useful for writing on non-absorbent surfaces.

Ink for the ink jet process

An ink jet device for recording colored images comprises a plurality of nozzles for producing differently colored ink jets which are directed on to a common point in the plane of a recording support; a control electrode, an extraction system for removing the ink deflected and hence not used for recording and an aperture diaphragm being associated with each of the nozzles; the control electrodes, extraction systems and diaphragms being combined into a block; the control electrodes being electrically insulated with respect to each other and with respect to earth and the nozzles being at electrical earth potential.

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Leverkusen, Germany

Klaus Hoffmann