characterised by the use of the objects (making heat exchangers B21D53/02)

Introduced: September 1968

Title

Titles differ between systems:

IPC: characterised by the use of the objects

CPC: characterised by the use of the objects (making heat exchangers B21D53/02)

Full titles differ between systems:

IPC:

Making hollow objects > characterised by the use of the objects

CPC:

Making hollow objects (from thick-walled or non uniform tubes B21K21/00) > characterised by the use of the objects (making heat exchangers B21D53/02)

IPC and CPC are identically structured here. All 7 subcodes exist in both systems.

2 shared codes have differing titles between IPC and CPC.

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B21D 51/18 vessels, e.g. tubs, vats, tanks, sinks, or the like IPC+CPC Available in IPC and CPC
B21D 51/24 high-pressure containers, e.g. boilers, bottles IPC+CPC Available in IPC and CPC
B21D 51/26 cans or tins; Closing same in a permanent manner (making outlet arrangements B21D51/38; welding or soldering B23K) +8 CPC IPC+CPC Available in IPC and CPC
B21D 51/36 collapsible or like thin-walled tubes, e.g. for toothpaste +1 CPC IPC+CPC Available in IPC and CPC
B21D 51/38 Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures +1 CPC IPC+CPC Available in IPC and CPC
B21D 51/52 boxes, cigarette cases, or the like IPC+CPC Available in IPC and CPC
B21D 51/54 cartridge cases, e.g. for ammunition, for letter carriers in pneumatic-tube plants IPC+CPC Available in IPC and CPC

Class B21,2013–2023, worldwide · Source: EPO PATSTAT

Class B21,2013–2023, worldwide · Source: EPO PATSTAT