USD257282SExpiredUtility

Roof stack vent

Assignee: GAF CORPPriority: Feb 8, 1979Filed: Feb 8, 1979Granted: Oct 7, 1980

Est. expiryFeb 8, 1999(expired)· nominal 20-yr term from priority

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Claims

exact text as granted — not AI-modified

The ornamental design for a roof stack vent, substantially as shown and described.

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