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
Method and device for accessing the documentation of an aircraft according to alarms generated therein
Rotating device
Using location based services for determining a calling window
Semiconductor device and method of forming interconnect structure with conductive pads having expanded interconnect surface area for enhanced interconnection properties
Mask and method for forming the mask
Intraoral camera for dental chairs
Polynucleotide capture materials, and methods of using same
  Randomly Featured Patents
Displaying subtitles
Electronic device with access structure for handling hard disc drive
Stabilized moulding material
Mote networks using directional antenna techniques
Applicator
Self-loading disc head slider having blunt cross rail
Cassette tape holder
Methods of and apparatus for mooring and for connecting lines to articles on the seabed
Dark channel array with scattering centers
Phase detector and method of phase detection