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
Liquid crystal display device
Highly specialized application protocol for email and SMS and message notification handling and display
Dynamically updating privacy settings in a social network
Electronic device with a screen
Single-electron detection method and apparatus for solid-state intensity image sensors with a charge splitting device
Measuring device and measuring method that use pulsed electromagnetic wave
Wrench head
  Randomly Featured Patents
Electronic flash apparatus of a camera
Fire-retardant particle board and binder therefor from aminoplast with ammonium polyphosphate-formaldehyde product
Impedance tuner with integrated bias network
Door mounted seasonal decoration hanger
Fabrication method of multisensors chips for detecting analytes
Dye releasing couplers for heat image separation systems
Automatic gun loading device for a tank
Process and apparatus for realizing a digital neural network using electronic family
Power supply device
Method and apparatus for phishing and leeching vulnerability detection