Static structures (e.g. – buildings) – With entrance for persons or objects in horizontal or... – With additional enclosure structure; e.g. – manhole
Reexamination Certificate
2004-11-05
2009-12-08
Canfield, Robert J (Department: 3633)
Static structures (e.g., buildings)
With entrance for persons or objects in horizontal or...
With additional enclosure structure; e.g., manhole
C052S592600, C220S004260, C404S025000, C174S039000
Reexamination Certificate
active
07627992
ABSTRACT:
A stackable riser section having a single side wall having a first open end defined by an edge and a second open, channel end. The riser section includes a plurality of bosses extending to the first open end and connected to an interior surface of the sidewall by narrow webs. A channel, on the channel end of one riser is adapted to receive the bosses of a mated riser. A wall defining the boss receiving channel has a plurality of slots with at least a portion defined by parallel edges. The slots receive the webs that connect the bosses to the riser sidewall. The bosses are wider than the portion of the slots defined by the parallel edges. The slotted wall includes thickened wedge portions to snugly fit with the first open end of another riser section. A cover is disclosed that includes the same channel end to coact with the first open end of a riser section.
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patent: 2003/0145527 (2003-08-01), Meyers
Canfield Robert J
Demuren Babajide
Gavin Peter W.
Jenner & Block LLP
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