USD453042SExpiredUtility

Coupling ring for ventilation ducts

Assignee: LINDAB ABPriority: Jan 17, 2001Filed: Jan 17, 2001Granted: Jan 22, 2002

Est. expiryJan 17, 2021(expired)· nominal 20-yr term from priority

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Claims

exact text as granted — not AI-modified

The ornamental design for a coupling ring for ventilation ducts, as shown.

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