USD313568SExpiredUtility

Portable signalling device for monitoring telephone rings

36
Individually held — no corporate assignee on recordPriority: Feb 6, 1989Filed: Feb 6, 1989Granted: Jan 8, 1991
Est. expiryFeb 6, 2009(expired)· nominal 20-yr term from priority
Inventors:Kal R. CastleberryGinger L. Castleberry
36
PatentIndex Score
7
Cited by
4
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for a portable signalling device for monitoring telephone rings, as shown and described.

Join the waitlist — get patent alerts

Track USD313568S — get alerts on status changes and closely related new filings.

We store only your email — no account needed. See our privacy policy.