Abstract: Brush plating of metal objects with noble metals is improved by using a brush body of a rigid, dimensionally stable non-porous material such as titanium which will not distort appreciably at higher temperatures, e.g. 77.degree.-83.degree. C., together with a porous brush insert lying along the edge of the brush which bears against the workpiece and to which the plating electrolyte is supplied through branches from a conduit through which the electrolyte flows at a controlled rate. In this system the electrolyte is supplied to the work area at an elevated temperature, e.g. 77.degree.-87.degree. C., with resultant increase in the speed at which higher quality plating can be performed. Special forms of anode electrode and of the electrical contact to the workpiece are preferably also employed.

Abstract: Continuous spot plating, for example, of spots or separately defined regions of precious metals onto a metal substrate is disclosed. According to the disclosure, a multiplicity of plating heads are mounted for movement upon command on a rotating, endless belt or bandolier which is disposed adjacent to the path of travel of a moving strip of substrate metal, such as copper, on which the regions are to be plated. Sensing devices are mounted adjacent to the path of travel of the metal strip to detect and indicate the regions on the strip which are to be plated. The sensing of a region to be plated connects the next available plating head to the belt or bandolier for movement along a path in which the plating head is in contact with the region to be plated and moves at the same speed as the strip to effect electrolytic deposit of metal ions on the strip. Sufficient plating heads are provided so that a separate plating head is avaiable for activation to effect plating one each region requried to be plated.

Abstract: A rotary brush plating apparatus utilizing a porous brush member formed of a hydrophobic material is disclosed. Plating solution is pumped interiorly of rotating, cylindrical brush member and radially outwardly through interconnected pores to its periphery where plating takes place by the passage of parts lengthwise of the brush member in contact with its surface. A continuous circulation of plating solution is provided so that an adequate supply is always provided on the brush surface. Means are provided for recapturing excess solution for return to the reservoir.

Abstract: Selective electrolytic plating of small interconnected parts at high rates of production is disclosed. A porous hydrophobic material serves as the body of a brush member which has surfaces configured to transfer charged electrolytic solution to the selected surfaces of the parts being plated. Electrolytic solution is delivered under pressure to the interior of the body member.

Abstract: Filtering equipment has an inlet chamber which houses removable filtering cylindrical cartridges. The circular end surfaces of each cartridge are seated by annular seats, one on a rigid divider which separates the inlet chamber from an oulet, and the other associated with a removable rigid cover which is spaced a predetermined distance from the divider when the cover is fixedly mounted to close the inlet chamber. These two seats serve as seals for the ends of the associated filter cartridge, and at least the latter annular seat is flexibly yieldable in the axial direction of the cartridge. The normal combined axial dimension of the cartridge and its two seats, when not under axial compression, is greater than the normal distance between the divider and the cover, so that, when the cover is clamped down, in its assembled position on the inlet chamber, the flexible annular seat member is distorted, to form a tight seal against the cartridge and the cover.