USD259950SExpiredUtility

Trench drain

82
Individually held — no corporate assignee on recordPriority: Sep 26, 1978Filed: Sep 26, 1978Granted: Jul 21, 1981
Est. expirySep 26, 1998(expired)· nominal 20-yr term from priority
Inventors:John Henry
82
PatentIndex Score
29
Cited by
5
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for a trench drain, as shown.

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