siliceous

Introduced: January 1990

Full Title

Full titles differ between systems:

IPC:

Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material > Inorganic fibres or flakes > siliceous

CPC:

Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material (chemical features in the manufacture of artificial fibres D01F) > Inorganic fibres or flakes > siliceous

IPC and CPC are identically structured here. All 3 subcodes exist in both systems.

2 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 1990.

Child Classifications

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D21H 13/40 vitreous, e.g. mineral wool, glass fibres since 1990 IPC+CPC Available in IPC and CPC
D21H 13/42 Asbestos since 1990 IPC+CPC Available in IPC and CPC
D21H 13/44 Flakes, e.g. mica, vermiculite since 1990 IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class D21,2013–2023, worldwide · Source: EPO PATSTAT

VOITH PATENT DE 1,809
STORA ENSO FI 1,467
KEMIRA FI 1,086
KIMBERLY-CLARK CORPORATION US 935
VALMET TECHNOLOGIES FI 924
VALMET SE 904
P&G (PROCTER & GAMBLE COMPANY) US 862
OJI HOLDINGS CORPORATION 696
OMYA INTERNATIONAL CH 584
SOUTH CHINA UNIVERSITY OF TECHNOLOGY 571

Top Applicants (CPC)

Class D21,2013–2023, worldwide · Source: EPO PATSTAT

VOITH PATENT DE 1,857
STORA ENSO FI 1,552
KEMIRA FI 1,173
KIMBERLY-CLARK CORPORATION US 1,107
VALMET TECHNOLOGIES FI 965
VALMET SE 943
P&G (PROCTER & GAMBLE COMPANY) US 941
OMYA INTERNATIONAL CH 821
UPM-KYMMENE CORPORATION FI 512
SEIKO EPSON CORPORATION JP 501