Abstract: The apparatus comprises a metering roller (7) for the metered supply of liquid developer to an applicator roller (10). A profiled roller (11) is provided for pressing the photosensitive stock against the applicator roller. The profiled roller has a cylindrical core (12). The outer surface of the core is completely covered with a coating (13) of a permanently elastic material. The surface of the coating remote from the core is provided with projecting, mutually staggered, substantially conical or pyramidal nubs (14). The nubs are made of the same permanently elastic material as the coating. A pressing roller (17) rests against the profiled roller and, in the direction of travel designated from I to O of the stock to be developed, precedes the point of contact of the profiled roller against the applicator roller. Stock inserted at I is grasped at the point of contact (19) between the pressing roller and the profiled roller and conveyed on.

Abstract: An article with at least a portion carrying symbols representing information to be protected against photocopying is formed by a carrier, a continuous layer covering the portion of the carrier and forming a background thereon, and a mainly discontinuous layer applied on the continuous layer and forming the symbols against the background. One of the layers is an iridescent layer of a color that copies dark and the other of the layers has a dark color. Thus photocopying gives an image without distinction between the symbols and the background.

Abstract: A desensitizing ink for wet offset printing on the acceptor surface of a chemical duplicating set of superimposed sheets where one of the sets has an electrophilic acceptor coating and the other a nucleophilic coating for producing a chromogenic reaction wherein the nucleophilic desensitizing ink contains an alkoxylated nucleophilic compound which permits a continuous ink transfer to the water repellant zones of the wetted impression plate of an offset press and simultaneously neutralizes the corresponding zones of the acceptor surface.

Abstract: Apparatus for fixing electrophotographic images carrying toner powder and comprising an upper heated fixing roller and a lower driven counter roller cooperating with the fixing roller to form a nip for the passage of image bearing sheets to be fixed, the fixing roller having a resilient tubular shell of metal or other material of high thermal conductivity.

Abstract: An electrophotographic copying machine which includes an endless and seamless image forming and transfer band of electrically conducting material having a coating of photoconductive material.

Abstract: Apparatus for fixing electrophotographic images produced by an electrophotographic copying machine, comprising a conveyor belt for transporting image bearing sheets on its upper run and a planar heater which extends substantially parallel to the upper run and is disposed closely above it but out of contact with the sheets.

Abstract: A photocopying machine which includes a band conveyor for transporting sheet material through the machine, the conveyor including end drums supporting a band of seamless and endless perforated metal with its upper run disposed over a suction chamber.