Abstract: In a method of manufacturing, the steps of: providing a workpiece comprising a main body and a machine-readable marking on a portion of the body, depositing on the marking and the surrounding surface an overcoating of a liquid polymeric composition that is curable by exposure to ultraviolet radiation, and then irradiating the liquid overcoating with ultraviolet radiation so that the overcoating cures to a solid nontacky, light-transmitting protective coating. The workpiece, with the cured protective coating thereon, may be subjected to processing steps wherein extraneous matter may adhere to the coating, and then be cleaned leaving the cured coating intact.

Abstract: In a method of manufacturing, the steps of: providing a workpiece comprising a main body and a machine-readable marking on a portion of the body, depositing on the marking and the surrounding surface an overcoating of a liquid polymeric composition that is curable by exposure to ultraviolet radiation, and then irradiating the liquid overcoating with ultraviolet radiation so that the overcoating cures to a solid nontacky, light-transmitting protective coating. The workpiece, with the cured protective coating thereon, may be subjected to processing steps wherein extraneous matter may adhere to the coating, and then be cleaned leaving the cured coating intact.

Abstract: The method comprises producing on the surface to be etched a stencil of a light-hardened PVA. The stencil is produced by light hardening selected portions of a film or coating consisting essentially of dichromate-sensitized PVA containing about 5 to 30 weight percent with respect to the weight of PVA solids of N-methylol acrylamide. After light hardening, the nonhardened portions of the film are removed, thereby producing the stencil. The stencil is baked to improve its etch resistance, the surface is etched through the stencil, and then the stencil is removed from the surface.

Abstract: The method comprises producing on the surface to be etched a stencil of a light-hardened PVA. The stencil is produced by light hardening selected portions of a film or coating consisting essentially of dichromate-sensitized PVA. The PVA is about 85% to 97% hydrolyzed and has a molecular weight of 75,000 to 100,000. After light hardening, the nonhardened portions of the film are removed, thereby producing the stencil. The stencil is baked to improve its etch resistance, the surface is etched through the stencil, and then the stencil is removed from the surface.

Abstract: The etch resistance of a casein-based photoresist pattern to low specific gravity ferric chloride-based etchant solutions is increased by treating the photoresist pattern with a methylene blue solution, containing at least 0.1 weight percent methylene blue, prior to exposure to the etchant solution.

Abstract: The addition of N-methylol acrylamide as an accelerator to casein-based aqueous photoresist compositions reduces the baking temperature required to render the developed resist etch resistant.

Abstract: The addition of N-methylol acrylamide as an accelerator to casein-based aqueous photoresist compositions reduces the baking temperature required to render the developed resist etch resistant.

Abstract: A compass having a magnetic element pivotally mounted in a housing, the housing including a light source and one end of an array of fiber optic bundles and the element carrying a reflector and/or an aperture to selectively permit light from the source to reach a selected one or more of the fiber optic bundle ends within the housing in dependence upon the orientation of the element relative to the housing about the pivot axis of the pivotal mounting.

Abstract: The method comprises applying to a surface to be etched a coating of a liquid composition comprising an acid-precipitated casein, alkali dichromate photosensitizer, sodium borate and water. The layer is dried, photoexposed, developed and baked to produce an etch-resistant stencil.

Abstract: A shielding holder for a syringe made of a dense material of varying thickness to shield the fingers of a user of a syringe within the holder from radiation during use yet permitting the user to see the fluid remaining within the syringe by reflection in a mirror on the holder of the syringe.

Abstract: A teaching device for use with a musical keyboard or equivalent, such as a piano, organ or multistringed instrument; the device including a compact housing for containing control means, and indicating means including light emitting elements for positioning relative to the keys of a keyboard or selected positions on a multistringed musical instrument, and flexible optical cable means for transmitting light from a source to selected light emitting elements as determined by the operation of the control means.