Abstract: A mobile regeneration apparatus is provided for regenerating dryers. The regeneration apparatus may be used to regenerate single tower desiccant dryers located at natural gas vehicle refueling stations. For optimum performance, each dryer may be located upstream of a respective compressor.

Abstract: A process for fabricating matrix cathode ray tubes having phosphor receiving areas smaller than the areas exposed through an apertured mask includes the steps of coating the inner surface of a viewing panel with a first film of photo-sensitive resist material; exposing the first film through an apertured mask to provide insolubilized areas of a given size; depositing a second film of resist material onto said first film; removing the second film, soluble areas of the first film, and portions of the insolubilized areas of the first film to provide insolubilized areas of the first film of a size smaller than said given size; overcoating with an opaque film, removing the overcoated insolubilized areas of a size smaller than the given size; and depositing phosphors in place of the removed insolubilized areas of a size smaller than said given size.

Abstract: Vinylsulphone compounds of the general formula[CH.sub.2 =CHSO.sub.2 CH.sub.2 CH.sub.2 (CONH).sub.x (CH.sub.2).sub.3 ].sub.2 --O(CH.sub.2 CH.sub.2 O).sub.y --,wherein x is 1 or 2 and y is 0 or an integer of 1 to 100 are provided. These compounds are useful as cross-linking agents for hydrophilic colloids, especially for gelatin which is in the form of layers of photographic materials.

Abstract: A half-tone screen comprises a transparent or opaque sheet having an uneven face with a multitude of projections thereon coated with a paint or varnish of contrasting color. By scraping, the coating material is removed and the projections decapitated to a selected degree to provide desired progressive shading effects.