SPIRAL STAIRCASE
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United States of America Patent
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Issued Date -
Oct 27, 2011
app pub date -
Nov 27, 2009
filing date -
Nov 27, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A spiral staircase comprises a central supporting element and a plurality of steps which are connected to the supporting element at a first end, there being two types of steps positioned in an alternating fashion, of which a first type of step is substantially “L”-shaped and a second type of step is substantially arrow-shaped.
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