Spiral staircase
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Apr 4, 2000
Issued Date -
N/A
app pub date -
Aug 4, 1997
filing date -
Apr 15, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The circular staircase has individual steps made of stone, and in particular natural stone, mounted on a central newel. The steps each have a reinforcing member with one end that is joined to the newel and he other end that has a prestressing element against a step.
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