Abstract: An activated carbon air filter for use in room air cleaners and the like has a corrugated paper structure formed of substantially non-porous paper, preferably Kraft paper, whose surface is coated with carbon by means for example of a dipping process in which the structure is immersed in an aqueous slurry containing carbon and a binder. Through use of a particular paper thickness and channel dimensions, a highly efficient, low volume, long lifetime air cleaning filter is obtained.

Abstract: An activated carbon air filter for use in room air cleaners and the like comprises a corrugated paper structure formed of substantially non-porous paper, preferably Kraft paper, whose surface is coated with carbon by means for example of a dipping process in which the structure is immersed in an aqueous slurry containing carbon and a binder. Through use of a particular paper thickness and channel dimensions, a highly efficient, low volume, long lifetime air cleaning filter is obtained.

Abstract: A method of forming copper patterns on a selection plate for a display, the selection plate having a plurality of holes. The method provides copper patterns that form selected tracks on the selection plate and that are disposed internally of selected holes, the copper patterns being sealed with a corrosion-resistant layer of nickel-phosphorous. The method includes steps of forming a copper layer on at least one surface of the selection plate, forming a layer of nickel-boron on the copper layer, using cataphoretic lithographic processing to form the desired patterns, and providing a nickel-phosphorous layer to seal the patterns.