IPC Subgroup
E04F 11/04 Movable stairways, e.g. of loft ladders which may or may not be concealable or extensible
Introduced: September 1968
Last revised: January 2006
Full Title
Stairways, ramps, or like structures; Balustrades; Handrails > Stairways; Layouts thereof > Movable stairways, e.g. of loft ladders which may or may not be concealable or extensible
Classification Context
- Section:
- FIXED CONSTRUCTIONS
- Class:
- BUILDING
- Subclass:
- FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
Related Keywords
loft LADDER(S) as movable stairways
1 direct subcode
Child Classifications
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- E04F 11/06 collapsible, e.g. folding, telescopic
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