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
Extreme ultraviolet light generation apparatus
Semiconductor device and fabrication method
Phase-amplitude 3-D stereo encoder and decoder
Reading apparatus and reading method
Process for filtering interferograms obtained from SAR images acquired on the same area
Secure access to customer log data in a multi-tenant environment
Network based JIT on a priori knowledge of a set of disparate clients
  Randomly Featured Patents
Method for determining scattered disparity fields in stereo vision
Film on a surface of a mold used during semiconductor device fabrication
Replacement messages for identifying and preventing errors during the transmission of realtime-critical data
Measurement of thickness of dielectric films on surfaces
Digital prefiltering of encoded video signals
Coated tablets
Vial pack cover, vial pack kit, and method for forming the vial pack cover
Ferroelectric memory device, electronic apparatus
Set of keys for a keypad
Distribution of packets to multiple addresses