Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Early warning heat sensor system










Image Number 2 for United States Patent #5384562.

A heat-sensitive alarm trigger is used to set off a fire alarm system having an alarm circuit with a rated trigger resistance. The alarm circuit is triggered when a resistance across two sensor leads, between which the alarm trigger is connected, falls below the rated trigger resistance. The heat-sensitive alarm trigger comprises a laminate structure which includes an optionally perforated first electrode layer and a second electrode layer. A barrier material layer which is disposed between the two electrode layers has a resistance above the rated trigger resistance. A layer of hydrated material is disposed on the perforated electrode layer. When the hydrated material is heated above a given alarm trigger temperature, moisture is given off through the holes in the first electrode and, as a result, the barrier layer becomes sufficiently conductive so as to lower a resistance across the electrodes to below the rated trigger resistance. In the alternative, the hydrated layer is the barrier layer sandwiched between the electrodes. When the barrier layer reaches a given trigger temperature, its resistance falls below the rated trigger resistance, and the alarm circuit is triggered.








 
 
  Recently Added Patents
Wind driven generator for vehicles
Providing a web page to a client
Method and apparatus for a battery docking connector having reserve power for hot battery swap
Floor standing rack
Methods, devices and computer program products providing for establishing a model for emulating a physical quantity which depends on at least one input parameter, and use thereof
Controlling a resource demand system
System and method for providing a path avoidance feature in a network environment
  Randomly Featured Patents
Internal voltage generation circuit
Three piece ball template
Methods and systems for forecasting daily product sales
LED light source assembly with heat sink and heat conductive glass cover
Graphic data processing method and device
Geometric wall basket
Tire
Clicker for indicating position of arrow
Process for hydrotreating heavy hydrocarbons in liquid phase in the presence of a dispersed catalyst
Method and apparatus for determining correct installation for gear-driven fuel pump on a fuel injected IC engine