The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 24, 2009
Filed:
Aug. 07, 2006
Anthony J. Capowski, Westford, MA (US);
Michael A. Furtado, Shrewsbury, MA (US);
Paul H. Maier, Jr., Athol, MA (US);
Steven C. Kalafarski, Ashburnham, MA (US);
Anthony J. Capowski, Westford, MA (US);
Michael A. Furtado, Shrewsbury, MA (US);
Paul H. Maier, Jr., Athol, MA (US);
Steven C. Kalafarski, Ashburnham, MA (US);
SimplexGrinnell LP, Westminster, MA (US);
Abstract
In a fire alarm system, a message is sent on a pair of power lines to a notification appliance. The notification appliance responds to the message by activating one or more of its notification devices. In a standby mode, only enough power is supplied to the plural notification appliances, at a first voltage level, to support two-way communications between a system controller and the notification appliances. In an active mode, power is supplied at a second voltage sufficient to operate audible and visible alarms of the notification appliance. The notification appliance may include an addressable speaker. The addressable speaker connects to and receives messages over the pair of power lines, has plural taps for selecting audio power. In response to a command, a selector in an addressed smart speaker selects a tap to select a particular audio power.