(under subclass 299) Processes wherein either a portion of the base is removed by contact with a chemical agent or a solvent for the base is absorbed into the base.
(1) Note. This subclass does not provide for processes where the base is merely cleaned of extraneous material or a material which is not a normal part of the base, but does provide for dissolving out of natural fats, oils etc., prior to coating.
(2) Note. Leaching with a solvent or acid is considered etching for this subclass.
(3) Note. This subclass does not provide for pickling
unless etching is set forth.
SEE OR SEARCH THIS CLASS, SUBCLASS:
322, and 327+, for cleaning by more than name only of a substrate prior to coating. 336+, for solvent, swelling or washing treatment of a coating.
SEE OR SEARCH CLASS
216, Etching a Substrate: Processes, appropriate subclasses for processes of etching where the etching is not to perfect a subsequently applied coating, and for processes of etching combined with a coating process where the etching is a manufacturing step and is not intended to improve the adherence of the applied coating to a substrate.
