Resources Contact Us Home
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
Phone messaging using audio streams
Methods and systems for temporarily sharing position data between mobile-device users
System and method for determining payroll related insurance premiums
Oil extractor and the preparation method thereof
Circuit design approximation
Multiple RF band operation in mobile devices
  Randomly Featured Patents
Benzazepine derivatives, medicaments containing the same and their use to prepare medicaments
Method and system for multi-network authorization and authentication
Method and system for determining a three dimensional representation of a tubular organ
Fuel regulating mechanism for a rotary throttle valve type carburetor
Nylon-6 filament and method of manufacture thereof
Fluid purification systems and methods
Polyester resin blends with high-level gas barrier properties
Enriched antibody for detecting mycobacterial infection, methods of use and diagnostic test employing same
Contactor floor that holds an IC package to contactor pins within an IC package testing system with minimized solder flaking
Aromatic amine derivative and organic electroluminescence device using the same