USD471278SExpiredUtility

Oxygen concentrator

Assignee: CHENG MING-CHUANPriority: May 3, 2002Filed: May 3, 2002Granted: Mar 4, 2003

Est. expiryMay 3, 2022(expired)· nominal 20-yr term from priority

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exact text as granted — not AI-modified

The ornamental design for an oxygen concentrator, as shown.

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