USD330209SExpiredUtility

High security telephone instrument

33
Assignee: QUADRUM TELECOMMUNICATIONS INCPriority: Mar 22, 1991Filed: Mar 22, 1991Granted: Oct 13, 1992
Est. expiryMar 22, 2011(expired)· nominal 20-yr term from priority
Inventors:Charles J. Bass
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PatentIndex Score
2
Cited by
10
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for a high security telephone instrument, as shown.

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