USD398063SExpiredUtility

Step unit for a modular spiral staircase

24
Individually held — no corporate assignee on recordPriority: Oct 22, 1997Filed: Oct 22, 1997Granted: Sep 8, 1998
Est. expiryOct 22, 2017(expired)· nominal 20-yr term from priority
Inventors:Anthony Kline
24
PatentIndex Score
5
Cited by
2
References
1
Claims

Claims

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

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