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Indent Level
Color Curly Brackets (indicating CPC extensions to IPC)

CPC
COOPERATIVE PATENT CLASSIFICATION
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MAKING CHAINS (making chains or chain links by casting B22D 25/02; chains in general F16G)
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Making chains or chain links by bending work-pieces of rod, wire, or strip to form links of oval or other simple shape (B21L 3/00, B21L 7/00 take precedence)
.
by bending the ends of the workpieces to abut
.
by bending and interconnecting the ends of the workpieces with or without separate jointing members
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Making chains or chain links by bending the chain links or link parts and subsequently welding or soldering the abutting ends (B21L 7/00 takes precedence)
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Machines or devices for welding chain links
. .
by making use of forge or pressure welding
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Making chains or chain links by working the starting material in such a way that integral, i.e. jointless, chains links are formed
.
in such a way that interconnected links are formed
Making chains or chain links by cutting single loops or loop-parts from coils, assembling the cut parts and subsequently subjecting same to twisting with or without welding
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Making chains or chain links, the links being composed of two or more different parts, e.g. drive chains (B21L 1/04, B21L 7/00, B21L 11/14, B21L 13/00 take precedence)
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of roller-chain or other plate-link type
. .
Punching or bending the different parts of the chain links
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. .
Sorting, feeding, assembling, riveting, or finishing parts of chains
. . .
{
Assembling or disassembling
}
. .
Combining the chain links with auxiliary parts, e.g. welding-on wear-resistant parts
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Making chains or chain links of special shape
.
{
Making ornamental chains (B21L 11/02 to B21L 11/14 take precedence; ornamental chains A44C)
}
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each link being formed of a single member of which both ends are bent or shaped to engage the middle portions of the next link
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. .
the ends being pierced or punched to form eyes
. . .
the workpiece being of thin strip metal
. .
the ends being interengaged with other parts of the same link
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the chain links having opposed correspondingly shaped cylindrical and hook-like parts of which one parts forms a hinge-like support for the adjacent link (B21L 11/02 takes precedence)
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forming bead chains
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making chain links with inserted or integrally-formed studs
Making terminal or intermediate chain links of special shape; making couplings for chains, e.g. swivels, shackles
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Finishing or dressing chains or chain links, e.g. removing burr material, calibrating (B21L 9/06 takes precedence)
B21L 15/005
.
{
Pre-stretching chains
}
.
Twisting already closed links
Appurtenances for chain-making not restricted to any particular process
Tools or implements for repairing chains using metal-working operations. e.g. for detaching deformed chain links
Subject matter not provided for in other groups of this subclass
This page is owned by Office of Patent Classification.
Last Modified: 10/10/2013