USD268322SExpiredUtility

Door control system

44
Assignee: KASON IND INCPriority: Nov 24, 1980Filed: Nov 24, 1980Granted: Mar 22, 1983
Est. expiryNov 24, 2000(expired)· nominal 20-yr term from priority
Inventors:Irving L. Berkowitz
44
PatentIndex Score
3
Cited by
3
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for a door control system, as shown and described.

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