USD298473SExpiredUtility

Filtration unit for exhaust air from a clean room helmet worn for a sterile environment or the like

Assignee: W STOCKHOUSE ASS INCPriority: Aug 22, 1986Filed: Aug 22, 1986Granted: Nov 8, 1988

Est. expiryAug 22, 2006(expired)· nominal 20-yr term from priority

Inventors:Wyman H. Stackhouse Ian M. Williamson

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exact text as granted — not AI-modified

The ornamental design for a filtration unit for exhaust air from a clean room helmet worn in a sterile environment or the like, as shown and described.

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