USD450209SExpiredUtility

Backrest support frame for a chair

28
Priority: Apr 27, 1999Filed: Apr 27, 1999Granted: Nov 13, 2001
Est. expiryApr 27, 2019(expired)· nominal 20-yr term from priority
Inventors:Zi-Wen Cao
28
PatentIndex Score
1
Cited by
7
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for a backrest support frame for a chair, as shown and described.

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