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IPC Subgroup
D21D 1/02

Methods of beating; Beaters of the Hollander type

Introduced: September 1968

Last revised: January 2006

Full Title

Methods of beating or refining; Beaters of the Hollander type > Methods of beating; Beaters of the Hollander type

Classification Context

Section:
TEXTILES; PAPER
Class:
PAPER-MAKING; PRODUCTION OF CELLULOSE
Subclass:
TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE

Related Keywords

HOLLANDERS

8 direct subcodes

Child Classifications

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  • D21D 1/04 Beater rolls or bars
  • D21D 1/06 Bed plates
  • D21D 1/08 Beaters with means for driving the pulp quickly
  • D21D 1/1 Beaters with means for regulating the pressure between the beater roll and the bed plate
  • D21D 1/12 Beaters with means for continuous pulp discharge
  • D21D 1/14 Beaters with one beater roll and with vertical stuff circulation canal
  • D21D 1/16 Beaters with means for returning the pulp over the head of the beater roll
  • D21D 1/18 Beaters with two or more beater rolls

Top Applicants

Top 10 applicants by patent filingsfor class D21, 2013–2023, worldwide · Source: EPO PATSTAT

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