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IPC Subgroup
E04D 11/02

Built-up roofs, i.e. consisting of two or more layers bonded together , at least one of the layers being of watertight composition

Introduced: September 1968

Last revised: January 2006

Full Title

Roof covering, as far as not restricted to features covered by only one of groups; Roof covering in ways not provided for by groups > Built-up roofs, i.e. consisting of two or more layers bonded together , at least one of the layers being of watertight composition

Classification Context

Section:
FIXED CONSTRUCTIONS
Class:
BUILDING
Subclass:
ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS

Top Applicants

Top 10 applicants by patent filingsfor 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