Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1997-02-12
1998-07-28
Mullen, Jr., Thomas J.
Communications: electrical
Condition responsive indicating system
With particular system function
340511, 340521, 340526, G08B 2900
Patent
active
057867550
ABSTRACT:
Ordinary alarm conditions are escalated into a critical alarm condition by first accumulating the ordinary alarm conditions. Upon each ordinary alarm condition, a number of previously accumulated alarm conditions are deleted in accordance with the elapsed time since the last alarm condition. When the number of accumulated alarm conditions (less those deleted) exceeds a threshold, a critical alarm condition is then generated.
REFERENCES:
patent: 4528533 (1985-07-01), Hastings
patent: 4568924 (1986-02-01), Wuthrich et al.
patent: 5493273 (1996-02-01), Smurlo
Cicchino Domenic A.
Milton Stephen M.
AT&T Corp
Levy Robert B.
Mullen Jr. Thomas J.
Pope Daryl C.
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