E04D 3/36 Connecting; Fastening
Full Title
Roof covering by making use of flat or curved slabs or stiff sheets (E04D1/00 takes precedence; built-up roofs E04D11/02) > Connecting; Fastening
Filing statistics
CPC E04D 3/36 belongs to the parent subclass E04D, which recorded 27,560 patent applications worldwide between 2013 and 2023. Annual filings grew from 1,736 in 2013 to 2,648 in 2023 (+53%), peaking at 3,226 applications in 2020. The most active applicants in class E04 are CHINA CONSTRUCTION EIGHTH ENGINEERING DIVISION (1,675 applications), CHINA MCC17 GROUP COMPANY (1,593 applications) and ZHEJIANG YASHA DECORATION COMPANY (1,551 applications).
Source: EPO PATSTAT, worldwide filings
9 direct subcodes
Child Classifications
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- E04D 3/361 by specially-profiled marginal portions of the slabs or sheets
- E04D 3/365 by simple overlapping of the marginal portions with use of separate connecting elements, e.g. hooks or bolts for corrugated sheets
- E04D 3/366 by closing the space between the slabs or sheets by gutters, bulges, or bridging elements, e.g. strips
- E04D 3/368 by forcing together the marginal portions of adjacent slabs or sheets
- E04D 3/369 by welding of the marginal portions of adjacent slabs or sheets
Top Applicants
Top 10 applicants by patent filingsfor class E04, 2013–2023, worldwide · Source: EPO PATSTAT
- CHINA CONSTRUCTION EIGHTH ENGINEERING DIVISION 1,675
- CHINA MCC17 GROUP COMPANY 1,593
- ZHEJIANG YASHA DECORATION COMPANY 1,551
- SGCC(STATE GRID CORPORATION OF CHINA) 1,297
- GOLD MANTIS FINE DECORATION TECHNOLOGY (SUZHOU) COMPANY 1,212
- SHENYANG JIANZHU UNIVERSITY 926
- VAELINGE INNOVATION SE 901
- CHINA MCC5 GROUP CORPORATION 894
- VKR HOLDING DK 854
- SHANGHAI BAOYE GROUP CORPORATION 753