USD264997SExpiredUtility

Ventilating concrete block

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Assignee: LINDSLEY WARREN F BPriority: Apr 11, 1980Filed: Apr 11, 1980Granted: Jun 15, 1982
Est. expiryApr 11, 2000(expired)· nominal 20-yr term from priority
Inventors:Arnold C. Siedschlag
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PatentIndex Score
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Cited by
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References
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Claims

Claims

exact text as granted — not AI-modified
The ornamental design for a ventilating concrete block, as shown and described.

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