Resources Contact Us Home
Combustion product detector

Image Number 2 for United States Patent #4081684.

A combustion product detector contains a single ionization chamber having a radioactive source therein. It is provided with means to test the function of the device. The means includes an electrically non-conductive member which may be introduced in the ionization chamber to simulate (in effect) the presence of smoke in the chamber. Housing for the chamber is constructed and mounted to shield the components contained therein. An FET and resistors are closely coupled to a radioactive source holder and to a printed circuit board on which the housing is mounted. A metal coil spring electrically connects the non-conductive test member and the housing to discharge static. The test member may be removed readily to permit inspection and cleaning of the radioactive source surface. The device may be powered from a battery or from AC line current with or without a standby battery to automatically power the device in the event of line current failure and may be provided with a circuit to produce a signal in the event of power failure.

  Recently Added Patents
Process for preparing substituted aromatic carboxylic acids
PEGylated, extended insulins
High power fiber amplifier with stable output
Workflow-enabled client
Data modulation for groups of memory cells
System and method for improving cache efficiency
Data latch circuit and electronic device
  Randomly Featured Patents
Adaptive antenna method and apparatus
Portable communication device
Data transferring system and electronic apparatus
Liquid curable resin composition for optical fibers
Filtration cassette article and filter comprising same
Method for infusing potting compound into strands of a cable
System and method for dynamically transmitting network alert system (NAS) information from television network to stations using information embedded in an HDTV signal
Portfolio folder
Complex number multiplier
Automatic reset target assembly