Abstract:
The plating bath of the invention is an aqueous plating bath comprising, per liter of bath, from about 150 to about 700 grams of bath of fluoboric acid; from about 2 to about 15 grams of a plate modifying additive, preferably an amino acid chain compound; from about 15 to about 82 grams of metal selected from stannous tin or a mixture of stannous tin and lead, which mixture contains at least 5 weight percent tin, and from about 0.01 to about 1 gram of beta-naphtol. An electrically conductive substrate is plated with tin or a tin-lead alloy by immersing the substrate in the above plating bath at a temperature between about 50* and 100* F. and applying sufficient negative voltage to the substrate relative to an anode within the bath to cause a current density at the substrate of between about 7 and about 35 amperes per square foot.
Abstract:
A process is disclosed which comprises the steps of introducing a stream of the organic liquid onto a plurality of rotating reacting surfaces, rotating the reacting surfaces at a velocity such that the organic liquid is continuously formed into a thin film on each reacting surface and is continuously moved as a thin film towards the periphery of each reacting surface by centrifugal force, depositing over each thin film a substantially undiluted stream of a gaseous medium, reacting the organic liquid and gaseous medium on said rotating reacting surfaces, maintaining the pressure during reaction at subatmospheric levels, moving the resulting reaction products in a radially outward direction along each reacting surface and collecting said reaction product. An apparatus for carrying out such process is also disclosed.
Abstract:
A handle and retainer for engagement with a carrier for an article, said handle and retainer comprising at least two legs, means for changing the distance between the lower portion of said legs, means for engaging and disengaging the carrier which engaging and disengaging means operates upon the change in distance between the lower portion of the legs and at least one retaining bar for retaining the article in the carrier, which retaining bar is connected by one end to one of the legs, the other end of said retaining bar being unsecured.