Waste materials; Refuse

Introduced: January 1985

Full Title

Full titles differ between systems:

IPC:

Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone > Waste materials; Refuse

CPC:

Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone (use of waste materials for the manufacture of cement C04B7/24); Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone > Waste materials; Refuse

CPC subdivides this area 3x more granularly than IPC with 9 additional codes.

9 codes are CPC-only extensions.

3 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 1985.

Child Classifications

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C04B 18/0409 CPC only CPC only
C04B 18/0418 CPC only CPC only
C04B 18/0427 CPC only CPC only
C04B 18/0436 CPC only CPC only
C04B 18/0445 CPC only CPC only
C04B 18/0454 CPC only CPC only
C04B 18/0463 +1 CPC CPC only CPC only
C04B 18/0475 CPC only CPC only
C04B 18/0481 +1 CPC CPC only CPC only
C04B 18/06 Combustion residues, e.g. purification products of smoke, fumes or exhaust gases since 1985 +5 CPC IPC+CPC Available in IPC and CPC
C04B 18/12 from quarries, mining or the like since 1985 +1 CPC IPC+CPC Available in IPC and CPC
C04B 18/14 from metallurgical processes (treatment of molten slag C04B5/00) since 1985 +3 CPC IPC+CPC Available in IPC and CPC
C04B 18/16 from building or ceramic industry since 1985 IPC+CPC Available in IPC and CPC
C04B 18/18 organic (C04B18/10 takes precedence) since 1985 IPC+CPC Available in IPC and CPC
C04B 18/30 Mixed waste; Waste of undefined composition, (C04B18/10 takes precedence) since 1985 +1 CPC IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class C04,2013–2023, worldwide · Source: EPO PATSTAT

CHINESE ACADEMY OF SCIENCES 2,095
WUHAN UNIVERSITY OF TECHNOLOGY 1,205
NGK INSULATORS JP 1,133
HALLIBURTON ENERGY SERVICES GROUP US 1,049
SIKA TECHNOLOGY CH 1,041
GUILIN UNIVERSITY OF TECHNOLOGY 807
WUHAN UNIVERSITY OF SCIENCE AND TECHNOLOGY 806
SOUTHEAST UNIVERSITY 801
CORNING US 777
UNITED STATES GYPSUM COMPANY US 739

Top Applicants (CPC)

Class C04,2013–2023, worldwide · Source: EPO PATSTAT

HALLIBURTON ENERGY SERVICES GROUP US 2,158
CHINESE ACADEMY OF SCIENCES 1,569
NGK INSULATORS JP 1,504
SIKA TECHNOLOGY CH 1,181
CORNING US 974
WUHAN UNIVERSITY OF TECHNOLOGY 926
UNITED STATES GYPSUM COMPANY US 882
GE (GENERAL ELECTRIC COMPANY) US 828
MITSUBISHI MATERIALS CORPORATION JP 792
SAUDI ARABIAN OIL COMPANY SA 686