Resources Contact Us Home
Key sensor alarm for door locks

Image Number 3 for United States Patent #5680094.

A key reminder device for use in combination with a key lock mechanism having an adjustable timer with a predetermined timer interval electrically coupled to a replaced power supply. The timer is energized upon detection of a conventional key inserted into the key lock mechanism. Should the key remain in the key lock mechanism beyond a predetermined time, the timer will activate an audible alarm to remind the owner of the keys to remove them. Should the timer be set at a low level, the device operates to indicate the presence of a key. When used in combination with a visual indicator, the key reminder provides an indicator of door entry to the hearing impaired.

  Recently Added Patents
Multiple function graft polymer
Determining a route advertisement in a reactive routing environment
Optical rangefinder and reticle system for variable optical power sighting devices
Metal oxide semiconductor field effect transistor (MOSFET) gate termination
Decorated molded article and method for producing the same
Liquid crystal display
Neurostimulation system for implementing model-based estimate of neurostimulation effects
  Randomly Featured Patents
Plant sorbitol biosynthetic enzymes
Method for controlling a heat engine vehicle driving assembly
Wave motor tank
Receptacle for a chip card
High pressure discharge lamp and method for producing the same
Elastic exercise device
Process and apparatus for uprooting trees
Method of reducing planarization defects
Temperature adjustment in scanning beam devices
Encoding and transmitting variable bit streams with utilization of a constrained bit-rate channel