Skip to content
PCE
Search Classifications
Search for IPC and CPC classification codes or keywords
DIFF Subgroup
D21H 27/28

treated to obtain specific resistance properties, e.g. against wear or weather (water-repelling agents D21H21/16)

Introduced: January 1990

Title

Titles differ between systems:

IPC: treated to obtain specific resistance properties, e.g. against wear or weather

CPC: treated to obtain specific resistance properties, e.g. against wear or weather (water-repelling agents D21H21/16)

Full Title

Full titles differ between systems:

IPC:

Special paper not otherwise provided for, e.g. made by multi-step processes > Paper-based or board-based structures for surface covering > Structures being applied on the surface by special manufacturing processes, e.g. in presses > characterised by the overlay sheet or the top layers of the structures > treated to obtain specific resistance properties, e.g. against wear or weather

CPC:

Special paper not otherwise provided for, e.g. made by multi-step processes > Paper- or board-based structures for surface covering > Structures being applied on the surface by special manufacturing processes, e.g. in presses > characterised by the overlay sheet or the top layers of the structures (decorative panels B44C5/04; wood grain effects B44F9/02) > treated to obtain specific resistance properties, e.g. against wear or weather (water-repelling agents D21H21/16)

No child classifications to compare. This is a leaf node in both IPC and CPC.

Top Applicants

Top Applicants (IPC)

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

Top Applicants (CPC)

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

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