USD673691SActiveUtility

Spiral staircase

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Assignee: ALESSANDRINI PIEROPriority: May 26, 2011Filed: May 26, 2011Granted: Jan 1, 2013
Est. expiryMay 26, 2031(~4.8 yrs left)· nominal 20-yr term from priority
Inventors:Piero AlessandriniChiara Alessandrini
20
PatentIndex Score
2
Cited by
3
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for a spiral staircase, as shown.

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