IPC Main Group
E04D 3/00 Roof covering by making use of flat or curved slabs or stiff sheets
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- FIXED CONSTRUCTIONS
- Class:
- BUILDING
- Subclass:
- ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
Related Keywords
SHEET(S) adapted for roof coveringSLABS adapted for roof covering
6 direct subcodes
Child Classifications
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- E04D 3/02 of plane slabs, slates, or sheets, or in which the cross-section is unimportant
- E04D 3/24 with special cross-section, e.g. with corrugations on both sides, with ribs, flanges, or the like
- E04D 3/35 Roofing slabs or stiff sheets comprising two or more layers, e.g. for insulation
- E04D 3/36 Connecting; Fastening
- E04D 3/38 Devices for sealing spaces or joints between roof-covering elements
- E04D 3/4 Slabs or sheets locally modified for auxiliary purposes, e.g. for resting on walls, for serving as guttering; Elements for particular purposes, e.g. ridge elements, specially designed for use in conjunction with slabs or sheets
Top Applicants
Top 10 applicants by patent filingsfor class E04, 2013–2023, worldwide · Source: EPO PATSTAT
- CHINA CONSTRUCTION EIGHTH ENGINEERING DIVISION 6,575
- ZHEJIANG YASHA DECORATION COMPANY 4,488
- SGCC(STATE GRID CORPORATION OF CHINA) 4,427
- CHINA CONSTRUCTION SECOND ENGINEERING BUREAU 4,352
- CHINA MCC17 GROUP COMPANY 3,122
- GOLD MANTIS FINE DECORATION TECHNOLOGY (SUZHOU) COMPANY 2,605
- SHENYANG JIANZHU UNIVERSITY 2,420
- CHINA CONSTRUCTION SEVENTH ENGINEERING DIVISION COMPANY 2,284
- CHINA CONSTRUCTION FIFTH ENGINEERING DIVISION CORPORATION 2,008
- CHINA CONSTRUCTION FIRST BUILDING (GROUP) CORPORATION 1,967