USD447544SExpiredUtility
Headwall structure for drainage conduit
Priority: Mar 20, 2000Filed: Sep 7, 2000Granted: Sep 4, 2001
Est. expiryMar 20, 2020(expired)· nominal 20-yr term from priority
Inventors:Donald S. Quin
62
PatentIndex Score
16
Cited by
12
References
1
Claims
Claims
exact text as granted — not AI-modifiedThe ornamental design for a headwall structure for drainage conduit, as shown and described.
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