(under subclass 26) Processes in which a subsequently applied agent operates to chemically neutralize a previously applied agent, e.g., where an alkaline agent operates to neutralize a previously applied acidic agent.
(1) Note. Even though the actual application of the first agent is not claimed, where the subsequently applied agent is claimed as neutralizing or being neutralized by such a previously applied agent, the patent is here.
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28, for sequential treatments, at least one being a treatment by an acid agent, but having no neutralizing treatment.
29, for sequential treatments, at least one being a treatment by an alkaline agent, but having no neutralizing treatment.
41, for treatments of metal bases with acid agent, not involving the use of a sequentially applied treating agent.
