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Etching a substrate: processes
SECTION I - CLASS DEFINITION
Class 216 is an integral part of Class 156. It incorporates all
the definitions, rules, and hierarchy pertaining to subject matter
of Class 156.
GENERAL STATEMENT OF CLASS 216 SUBJECT MATTER:
This is the Generic class for chemical etching processes for
treating articles of commerce or intermediate articles not otherwise
provided for in which one of the manufacturing steps includes a
chemical etching step (use of an etchant) and wherein the material
treated is not completely removed.
| | (1)
Note. The chemical etching required for placement in this
class is any intentional change of shape of an article or substrate
by the removal of material involving a chemical reaction or physical
solvation using a chemical agent (the etchant). This is the residual
class for removing a surface by chemical reaction or solvent action
regardless of the substrate acted on. Bright Polishing of a metal
with acid solution is considered etching and appropriate for this class.
The processes of the patents in this class often include the formation
of a design, but the production of a design is not required to place
the patents here. |
| | (2)
Note. Reduction in size using a chemical etchant of an unmasked
article, substrate or unmasked geometric figure, e.g., sphere, etc.
is proper for this class. |
| | (3)
Note. Etching of a masked article, to direct the etchant
to only a portion of the article or substrate is proper for this
class. |
| | (4)
Note. This class is not intended for the total dissolving
of an article or substrate. Furthermore, the remaining article
or substrate must be the desired product and not the removed material.
An example of a process not proper for Class 216 would be ore beneficiating
where the dissolved material is what is desired and useful and not
the remaining residue material. Additionally a process of dissolving
out impurities or unwanted material to leave a desired article is
proper for this class when said process is not provided for elsewhere. |
| | (5)
Note. Chemical milling is considered within the scope of
the term etching. |
| | (6)
Note. Class 216 provides only for etching processes. Etching
compositions are elsewhere. See Lines With Other Classes, below. |
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