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Class 340/815.92 - Gravity operated drop annunciator


Subclass of Class 340 - Communications: electrical
Definition: Subject matter in which the target is moved into an annunciation
No. of patents: 1
Last issue date: 10/01/1991


NumberTitleIssue Date
5053752Smoke detector and method using elongated flexible low battery condition indicator member
The low battery level indicator is provided for a smoke detector. When the battery in the smoke detector becomes so weak that its voltage drops below a pre-determined value, an elongated, flexible signal member such as a tape or cord is released from the ...
10/01/1991
 
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