Patent classifications
E
FIXED CONSTRUCTIONS
Load children
E04
BUILDING
Load children
E04D
ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
Load children
3/00
Roof covering by making use of flat or curved slabs or stiff sheets
Load children Filter patents View analytics View as hierarchy
E04D3/35
Roofing slabs or stiff sheets comprising two or more layers, e.g. for insulation
Load children Filter patents View analytics View as hierarchy
E04D3/358
with at least one of the layers being offset with respect to another layer
Filter patents View analytics View as hierarchy