Abstract: A process for the in-line, high speed manufacturing of magnetic products is disclosed. The process comprises the steps of printing onto a substrate, drying the ink print, making the appropriate cuts or scores on the substrate, applying a slurry of magnetizable material onto the substrate to create the magnet, drying the applied material, magnetizing the magnetic material and cutting and forming the substrate to the desired dimensions. Each of these steps may be performed in a single, in-line manufacturing operation running at high speeds.

Abstract: A scratch-off game card includes first and second sections. The first section is provided with a first set of game data covered by a substantially opaque scratch-off material. The second section is provided with a second set of game data covered by a substantially transparent material. The game card has provided thereon a patch of marking formulation for marking selected areas of the second section.

Abstract: A piece of printed material has preprinted, hidden data and includes a structure which prevents premature revealing of the hidden data. For example, an instant scratch-off lottery ticket according to the invention includes a substrate, an ink layer disposed on the substrate, the ink layer including hidden lottery data. An elemental-metal-free ink-receptive layer is provided between the ink layer and the substrate, whereby the metal-free layer prevents migration of ink from the ink layer through the substrate when the substrate has been contacted with a solvent.

Abstract: A method of simultaneously encoding successive groups of printed paper sheets or mass distributable material wherein the sheets are provided with unperceptable and virtually invisible common code pattern by laser means which is supplied with a distinct series of coded pulse signals in synchronism with control pulses to produce a different optically-scannable coded hole pattern on each group of printed sheets.