|  | B |
SECTION B — PERFORMING OPERATIONS; TRANSPORTING

|  | B01 - B07 |
Subsection index
LIQUID/LIQUID, LIQUID/GAS OR GAS/GAS SEPARATION |
Method |
General operations | B01D
by centrifugal force, using centrifuges or free-vortex apparatus | B01D
using magnetic or electrostatic effect | B03C
Apparatus |
General operations | B01D
by centrifugal force, using centrifuges or free-vortex apparatus | B04B, B04C
using magnetic or electrostatic effect | B03C
SOLID/LIQUID OR SOLID/GAS SEPARATION |
Method |
General operations | B01D
by centrifugal force | B01D
using centrifuges or free-vortex apparatus | B01D
using magnetic or electrostatic effect | B03C
Apparatus |
General operations | B01D
by centrifugal force | B01D
using centrifuges or free-vortex apparatus | B04B, B04C
using magnetic or electrostatic effect | B03C
SOLID/SOLID SEPARATION |
Method |
Dry methods |
material in bulk | B07B
Individual sorting | B07C
Screening, sifting, pneumatic sorting | B07B
using pneumatic tables or jigs | B03B
by magnetic or electrostatic effect | B03C
by centrifugal force | B07B
using centrifuges or free-vortex apparatus | B07B
Wet methods |
General operations | B03B
flotation, differential sedimentation | B03D
screening | B07B
Combinations Dry methods - wet methods | B03B
Apparatus |
Dry methods |
material in bulk | B07B
Individual sorting | B07C
Screening, sifting, pneumatic sorting | B07B
using pneumatic tables or jigs | B03B
by magnetic or electrostatic effect | B03C
by centrifugal force | B07B
using centrifuges or free-vortex apparatus | B04B, B04C
Wet methods |
General operations | B03B
flotation, differential sedimentation | B03D
screening | B07B
Combinations Dry methods - wet methods | B03B

SHAPING

|  | B21 |
MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (casting, powder metallurgy Fulltext... Hierarchy... Expanded...B22; shearing Fulltext... Hierarchy... Expanded...B23D; working of metal by the action of a high concentration of electric current Fulltext... Hierarchy... Expanded...B23H; soldering, welding, flame-cutting Fulltext... Hierarchy... Expanded...B23K; other working of metal Fulltext... Hierarchy... Expanded...B23P; punching sheet material in general Fulltext... Hierarchy... Expanded...B26F; processes for changing of physical properties of metals Fulltext... Hierarchy... Expanded...C21D, Fulltext... Hierarchy... Expanded...C22F; electroforming Fulltext... Hierarchy... Expanded...C25D 1/00)

|  | B21 |
Note(s) This class does not cover: combinations of operations covered by different subclasses of class Fulltext... Hierarchy... Expanded...B21, which are covered by subclass Fulltext... Hierarchy... Expanded...B23P; combinations of operations covered by any particular subclass of class Fulltext... Hierarchy... Expanded...B21 with operations covered by other classes, e.g. with operations involving removal of material, which are also covered by subclass Fulltext... Hierarchy... Expanded...B23P, except that if the operations covered by the other classes are subsidiary to the operations properly covered by a single subclass of Fulltext... Hierarchy... Expanded...B21 the combination is classified in that subclass. Processes of a kind covered by this class but applied to non-metallic materials are classified in this class if they are applicable to metal and cannot be classified fully in another class.

|  | B21G |
MAKING NEEDLES, PINS, OR NAILS

P:0 |  | B21G 1/00 |
Making needles used for performing operations (forming heads on pin-like needles Fulltext... Hierarchy... Expanded...B21G 3/12; making U-shaped hairpins Fulltext... Hierarchy... Expanded...B21G 7/04)

|  | B21G 1/02 - B21G 1/10 |
Note(s) Group Fulltext... Hierarchy... Expanded...B21G 1/12 takes precedence over groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...B21G 1/02-B21G 1/10.

|  | B21G 1/02 |
· | of needles with eyes, e.g. sewing-needles, sewing-awls

|  | B21G 1/04 |
· · | of needles specially adapted for use in machines or tools

|  | B21G 1/06 |
· | of needles with hook or barb, e.g. crochet hooks

|  | B21G 1/08 |
· | of hollow needles or needles with hollow end, e.g. hypodermic needles, larding-needles (Fulltext... Hierarchy... Expanded...B21G 1/10 takes precedence)

|  | B21G 1/10 |
· | equipped with locking means for the material to be drawn through, e.g. for repairing tubeless tyres

|  | B21G 1/12 |
· | Securing, cleaning-off burrs, reconditioning, polishing, grinding

P:30 |  | B21G 3/00 |
Making pins, nails, or the like (of pins with individual caps Fulltext... Hierarchy... Expanded...B21G 5/00; of U-like shape Fulltext... Hierarchy... Expanded...B21G 7/00; of split-pins Fulltext... Hierarchy... Expanded...B21G 7/08) [2]

|  | B21G 3/02 |
· | of pins of the kind used in the tailoring trade or the household

|  | B21G 3/04 |
· · | with locking or shielding device for the pin point, e.g. safety-pins

|  | B21G 3/06 |
· | of nails with shoulders

|  | B21G 3/08 |
· | of nails with head and two or more shanks or split shanks

|  | B21G 3/10 |
· | of undulated nails or pins

|  | B21G 3/12 |
· | Upsetting; Forming heads

|  | B21G 3/14 |
· | Reducing diameter of parts otherwise than by rolling

|  | B21G 3/16 |
· | Pointing, with or without cutting

|  | B21G 3/18 |
· | by operations not restricted to one of the groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...B21G 3/12-B21G 3/16 (Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...B21G 3/06-B21G 3/10 take precedence)

|  | B21G 3/20 |
· · | from wire of indefinite length (by rolling Fulltext... Hierarchy... Expanded...B21G 3/30)

|  | B21G 3/22 |
· · · | in pairs arranged head to head

|  | B21G 3/24 |
· · · | by simultaneously forming the head of one nail and the adjacent point of another

|  | B21G 3/26 |
· · | by cutting from strip or sheet material

|  | B21G 3/28 |
· · | by forging or pressing

|  | B21G 3/30 |
· · | by rolling

|  | B21G 3/32 |
· | Feeding material to be worked to nail or pin making machines

P:10 |  | B21G 5/00 |
Making pins or nails with attached caps or with coated heads

|  | B21G 5/02 |
· | of drawing-pins or pins of drawing-pin type

P:20 |  | B21G 7/00 |
Making pins of U-like shape or split-pins (of paper fasteners or staples Fulltext... Hierarchy... Expanded...B21D 53/46, Fulltext... Hierarchy... Expanded...B21F 45/16)

|  | B21G 7/02 |
· | of U-like shape

|  | B21G 7/04 |
· · | of hairpins

|  | B21G 7/06 |
· · · | of undulated hairpins

|  | B21G 7/08 |
· | of split-pins, e.g. cotter-pins