Abstract: Mild steel strip is galvanized in selected areas only, typically on one side only of the strip, by pretreating the areas selected for absence of galvanizing to form thereon a readily chemically strippable coating of chemically hydrated compounds non-wetting in molten zinc. Preferably, the pretreatment is carried out using phosphoric acid solution to form thereon a thin coating of a composite of hydrated iron phosphates and iron hydroxides. After passing the thus-treated steel strip through the molten zinc bath and solidification of the zinc coating, the composite coating is removed by dilute mineral acid. Mild steel strip galvanized on one side using this procedure has particular utility in the automotive industry.

Abstract: Silicon dioxide is pyrolytically deposited by the reaction of silane with oxygen on vertically mounted substrates in an evacuated system. A standard diffusion furnace equipped with a furnace tube which is vacuum tight is used. Injection tubes having multiple injection ports are positioned within the furnace tube to distribute the silane and the oxygen uniformly across a plurality of substrates which are positioned perpendicular to the furnace tube axis in a boat covered with a perforated shroud. The process is particularly useful in providing for the low temperature deposition of uniform layers of silicon dioxide on silicon wafers to be used in the fabrication of semiconductor devices.

Abstract: A metal article having perforations therein whose transverse cross-sectional dimension is less than 0.4 mm has formed thereon a surface diffusion alloy by applying a refractory filter element to the workpiece surface prior to the diffusion treatment, the filter element being a refractory felt based on metal fibres including chromium in a proportion by weight of from 10 to 60%. The felt is oxidized to give a layer of chromium oxide. This is followed by conventional thermochemical powder diffusion treatment in the presence of at least one chromium oxide-reducing element selected from aluminium, yttrium, titanium and the lanthanides.

Abstract: A decorative multicolored candle is produced by applying, to the side surface of a candle core, a removable solid member having a melting temperature higher than that of candle wax. The surface of the core and side member are coated successively with a plurality of superimposed different colored coatings of candle wax, and the solid member is removed through a slit cut in the superimposed coatings, thereby forming projections having multicolored free ends. Thereafter, one of more additional different colored coatings of candle wax are applied over the thus treated core. A sufficient amount of the additional coatings are then removed to expose the multicolored free ends of the projections outlined by the exposed colors of the additional coatings.

Abstract: A hinge of the semi-concealed, wrap-around type is provided with a slot extending transversely to the hinge axis so that with the cabinet door assembled to the door leaf of the hinge, the frame leaf of the hinge (which in its finally installed position seats on the edge of the frame) can be shifted to and temporarily secured in an angular orientation and forwardly of its finally installed position. In this position most of the parts of the frame which are ultimately covered by the frame leaf are exposed for a surface coating operation, and the door itself is in a position generally corresponding to a partly open position to facilitate the application of the coating to the inside face of the door. After the coating operation is completed the frame leaf is shifted to its finally installed position and secured to the cabinet frame.

Abstract: A process of producing powdered metal parts comprising the steps:1. Preforming powdered metal parts into a desired shape;2. Treating said preformed part with a substance which can fill the pores of said powdered metal parts, said substance being immiscible with organic lubricants;3. Contacting said treated metal part with a lubricant;4. Sizing or coining the lubricated powdered metal part; and5. Washing said powdered metal part to remove said lubricant.Preferably the sized powdered metal part is also heat treated.

Abstract: A method of continuous galvanizing a steel strip partially or one side, which comprises applying silicone resin to a part or on one side of the steel strip which is to be left non-plated in a subsequent continuous molten zinc coating, baking the silicon resin coated steel strip at a temperature ranging from 300 to 800.degree. C in an oxidizing atmosphere, and subjecting the steel strip to heat treatment in a reducing atmosphere and introducing the heat treated steel strip to a zinc coating bath.

Abstract: A method for coating the faces of parts having faces and backs, includes assembling the parts so that the faces and backs thereof define two opposed coating surfaces. The parts may be staggered, and alternate parts have their faces disposed in opposite directions, with faces recessed with respect to the backs of the adjacent parts. Both coating surfaces therefore comprise a plurality of recessed part faces interspersed with part backs.A hardenable coating such as a molten hard facing material is applied to both of the coating surfaces and allowed to harden. After hardening, the surfaces are ground to reduce the thickness of the hardened coating sufficiently to expose the part backs, leaving a desired residual layer of coating adhered to the recessed part faces. The parts are then disassembled to provide a plurality of separate parts, each having a coating on the face thereof.

Abstract: A dry duplicating method comprising the steps of pressure-imaging a continuous master web with images capable of exuding liquid ink under the effects of contact pressure such as roller pressure and collecting the imaged master web on a roll for duplicating use. The master web is such that at least one surface is receptive to the pressure-applied images but neither surface is capable of absorbing the liquid ink to any substantial degree. The imaged web is duplicated by continuously bringing it into surface contact with an ink-absorbent copy web while pressure is applied to exude the liquid ink from the master images onto the copy web to form a duplicate copy, after which the web is continuously rolled up on another roller for reuse.

Abstract: A long metal lead frame strip is wound onto a reel with a plastic ribbon interleaved therein to separate adjacent turns of the strip on the reel. The reel is subsequently submersed in an immersion plating solution. Metal ions of the plating solution displace metal atoms at the surface of the strip to form a uniformly thick plating thereon, even in areas that are contacted by the spacing ribbon.

Abstract: In the making of vehicle bodies such as truck and trailer bodies, the roof sheets are secured to the roof bows by means of a hot melt adhesive. Premature cooling of the adhesive which otherwise does not allow sufficient time to position the roof sheet and then mate it with the roof bows properly after the adhesive is applied, is prevented by employing a heat-insulating layer of glass fiber scrim cloth on the roof bows and upon which the hot melt adhesive is applied. Temporary clamping pressure forces the hot melt adhesive through the pores of the scrim cloth and into contact with the roof bows whereupon it rapidly cools and sets. The presence of the scrim cloth provides a substantial increase in the otherwise unacceptably low bonding strength of the hot melt adhesive.

Abstract: Azido-containing silane compositions of matter useful as coupling agents in the production of polymer composite articles.