USD477401SExpiredUtility

Pair of filter cartridges for a powered air-purifying respirator

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Assignee: 3M INNOVATIVE PROPERTIES COPriority: Aug 3, 2000Filed: Aug 3, 2000Granted: Jul 15, 2003
Est. expiryAug 3, 2020(expired)· nominal 20-yr term from priority
Inventors:Ian Thomas PetherbridgeDavid Cook
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PatentIndex Score
6
Cited by
19
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1
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Claims

exact text as granted — not AI-modified
The ornamental design for a pair of filter cartridges for a powered air-purifying respirator.

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