Abstract: A capillary writing pen of the type having an expansion or compensation chamber intermediate the ink reservoir and ambient air. The expansion chamber is improved such that inadvertent flowing of ink from the reservoir to the capillary pen tip due either to pressure or temperature changes is avoided. The interior wall of the expansion chamber is profiled as a contiguous series of transverse indentations which extend circumferentially about the tubular pen body to provide successive expansion areas for entrapment of air and constrictive areas where menisci of ink are formed. The forming of the menisci entraps air bubbles within the ink and, accordingly, provides increased resistance to capillary flow of ink.

Abstract: A capillary writing pen of the type having an expansion or compensation chamber intermediate the ink reservoir and ambient air. The expansion chamber is improved such that inadvertent flowing of ink reservoir to the capillary pen tip due either to pressure or temperature changes is avoided. The interior wall of the expansion chamber is profiled as a contiguous series of transverse indentations which provide successive expansion areas for entrapment of air and constrictive areas where menisci of ink are formed. The forming of the menisci entraps air bubbles within the ink and, accordingly, provides increased resistance to capillary flow of ink.

Abstract: Capillary writing pen of the type embodying a sleeve, an ink reservoir supported within the sleeve and a tubular writing point extending from the reservoir and through the bottom of the sleeve. Particularly, a sealing gasket supported within the cover for the sleeve, so as to seal both an expansion chamber leading to the ink reservoir and the tubular writing end or tip. The sealing gasket is characterized by its axial extensibility in the form of a bellows and, thus, accommodates tubular writing points of varying diameters and lengths.

Abstract: A process for the production of lettering or symbol templates by production of symbol cut-outs in a template sheet consisting of thermoplastic plastic, characterized by forcing the cut-out portions of the symbols in a shaping or forging step, and subsequently cutting off the protruding forced-out portions.

Abstract: An improved writing point assembly for stylographic, or tube pens and a method for making such an improved writing point. The writing tube itself may be formed by a deep drawing operation and then secured, in a surrounding relationship, to the front end of a plastic cylindrical member, which itself may be formed by being injection molded within the writing tube.

Abstract: An improved writing point assembly for stylographic, or tube pens and a method for making such an improved writing point. The writing tube itself may be formed by a deep drawing operation and then secured, in a surrounding relationship, to the front end of a plastic cylindrical member, which itself may be formed by being injection molded within the writing tube.