USD286563SExpiredUtility

Back draft shutter

Assignee: KUPFERBERG MINELPriority: Jul 1, 1983Filed: Jul 1, 1983Granted: Nov 4, 1986

Est. expiryJul 1, 2003(expired)· nominal 20-yr term from priority

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Claims

exact text as granted — not AI-modified

The ornamental design for a back draft shutter, as shown.

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