US PATENT SUBCLASS 52 / 180
.~ Perforate structure having twisted element or particular surface

Current as of: June, 1999
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52 /   HD   STATIC STRUCTURES (E.G., BUILDINGS)

177  DF  SPECIFIED WEAR OR FRICTION-TYPE TRAFFIC-CARRYING SURFACE {3}
180.~ Perforate structure having twisted element or particular surface

DEFINITION

Classification: 52/180

(under subclass 177) Structure having (1) spaced bars or strips which are twisted along their length or (2) a grating or perforated sheet having a feature forming a defined traffic carrying surface which is discrete with respect to the sheet or grating itself.

SEE OR SEARCH THIS CLASS, SUBCLASS:

660+, for another openwork lattice or fabric surface forming structure.