There is provided an improvement in the method of preparing printed circuit boards by chemically catalyzing the surface of an insulating material, electrolessly depositing a layer of copper thereon, masking selected areas of the copper layer not correspnding to the desired pattern of conductor lines, electrolytically depositing additional copper on the unmasked areas, removing the masking material and etching away the copper from the previously masked areas. The improvement comprises the steps o...

A package for retailing comestible products comprises a conventional wide-mouth container having a beaded rim fitted and sealed with a loose sheet of heat shrink film. This permits a shopper to feel the consistency of the product in the container before purchase while retaining sanitary conditions. Furthermore, the film can be made air tight if desired and will materially increase the shelf life of perishable products such as cottage cheese. A lid may also be applied to the rim over the film as ...

Each photoflash bulb, having a high internal resistance before use and a low internal resistance after use, is connected in series with a respective fuse, succeeding photoflash bulbs being connected in parallel with the fuse of the preceding photoflash bulb, or succeeding photoflash bulbs and fuse being connected in parallel with the fuse of the preceding photoflash bulb.

A device for moving a member by a controlled amount or to a controlled position. An element undergoing a rotary vibrational movement is coupled to rotate a rotatable member when the element vibrates in one direction but not when the element vibrates in the opposite direction, causing a slight incremental advance of the rotatable member in the one direction for each cycle of the vibrating element.

Method and apparatus for providing an offshore installation wherein a base means is positioned on a submerged surface, one or more pipelines drawn into socketed engagement with the base means, and divers manipulate misalignment accommodating coupling means to interconnect the socketed pipeline means with a submerged, fluid receiving or supplying riser means housed in a caisson means.

An apparatus for maintaining a pressure differential across an aperture between two volumes of different pressure having a circular impeller within a chamber of a circular housing with the outer circular wall of the housing being spaced a predetermined distance from the periphery of the impeller. The circular chamber is positioned between two volumes at different pressures. A flow splitter is positioned adjacent the periphery of the impeller near the aerodynamic window. A first set of vanes near...

An Indicia bearing disc of flexible plastic mounted and juxtaposed to a transparent mating solid disc rotated to provide rigidity to the flexible disc and method of projecting light onto the indicia for photocomposition.

By blocking part of a spinnerette orifice with a wire strand desirable cross-sectional shaped fibers of acrylonitrile polymer are obtained.

A method of providing a structural shape includes starting with waste paper and treating the waste paper in a hammer mill to produce paper fibers. The fibers are put through a screen. The screened fibers are mixed with a binder such as a thermosetting epoxy foaming resin or with a phenolic resin in water in preferred proportions. The water or other solvent is kept to a very small value to provide a relatively dry process. The mixture is then pressed in a geometrical shape under substantial press...

A system for providing auxiliary power comprises a primary circuit including a primary pump, an output line for providing primary power, and a return line. An auxiliary circuit includes an auxiliary pump, an output line for providing the auxiliary power and a return line. The auxiliary circuit also includes a valve for controlling fluid flow in the output and return line of the auxiliary circuit. A reservoir is connected to the primary return line and to the auxiliary return line. A controlled l...