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DIFF Subgroup
E04D 3/36

Connecting; Fastening

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Roof covering by making use of flat or curved slabs or stiff sheets > Connecting; Fastening

CPC:

Roof covering by making use of flat or curved slabs or stiff sheets (E04D1/00 takes precedence; built-up roofs E04D11/02) > Connecting; Fastening

Of 10 combined children, 5 exist in both systems.

4 codes are CPC-only extensions, 1 exist only in IPC.

Child Classifications

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  • E04D 3/3607 CPC only CPC only
  • E04D 3/3608 CPC only CPC only
  • E04D 3/365 by simple overlapping of the marginal portions with use of separate connecting elements, e.g. hooks or bolts for corrugated sheets IPC+CPC Available in IPC and CPC
  • E04D 3/366 by closing the space between the slabs or sheets by gutters, bulges, or bridging elements, e.g. strips IPC+CPC Available in IPC and CPC
  • E04D 3/367 by permanent deformation of the marginal portions of adjacent slabs or sheets, e.g. by folding the edges since 1985 IPC only IPC only
  • E04D 3/368 by forcing together the marginal portions of adjacent slabs or sheets IPC+CPC Available in IPC and CPC
  • E04D 3/369 by welding of the marginal portions of adjacent slabs or sheets IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class E04,2013–2023, worldwide · Source: EPO PATSTAT

  1. CHINA CONSTRUCTION EIGHTH ENGINEERING DIVISION 6,575
  2. ZHEJIANG YASHA DECORATION COMPANY 4,488
  3. SGCC(STATE GRID CORPORATION OF CHINA) 4,427
  4. CHINA CONSTRUCTION SECOND ENGINEERING BUREAU 4,352
  5. CHINA MCC17 GROUP COMPANY 3,122
  6. GOLD MANTIS FINE DECORATION TECHNOLOGY (SUZHOU) COMPANY 2,605
  7. SHENYANG JIANZHU UNIVERSITY 2,420
  8. CHINA CONSTRUCTION SEVENTH ENGINEERING DIVISION COMPANY 2,284
  9. CHINA CONSTRUCTION FIFTH ENGINEERING DIVISION CORPORATION 2,008
  10. CHINA CONSTRUCTION FIRST BUILDING (GROUP) CORPORATION 1,967

Top Applicants (CPC)

Class E04,2013–2023, worldwide · Source: EPO PATSTAT

  1. CHINA CONSTRUCTION EIGHTH ENGINEERING DIVISION 1,675
  2. CHINA MCC17 GROUP COMPANY 1,593
  3. ZHEJIANG YASHA DECORATION COMPANY 1,551
  4. SGCC(STATE GRID CORPORATION OF CHINA) 1,297
  5. GOLD MANTIS FINE DECORATION TECHNOLOGY (SUZHOU) COMPANY 1,212
  6. SHENYANG JIANZHU UNIVERSITY 926
  7. VAELINGE INNOVATION SE 901
  8. CHINA MCC5 GROUP CORPORATION 894
  9. VKR HOLDING DK 854
  10. SHANGHAI BAOYE GROUP CORPORATION 753