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
Dynamic lookup service in a distributed system
System and method for ranking content and applications through human assistance
Lithographic apparatus and device manufacturing method
Fabric-backplane enterprise servers with pluggable I/O sub-system
Login security with short messaging
Normalized contextual performance metric for the assessment of fatigue-related incidents
  Randomly Featured Patents
Fixing and release systems and fastener networks
Leadless ceramic chip carrier printed wiring board adapter
Processing aid, vinyl chloride resin composition containing the same, and process for producing molded article with the same
X-ray computed tomography apparatus with X-ray intensity control
Apparatus and process for controlling fluidized beds
Sound generation assignment device, music sound generator and sound generation assignment process program
Mechanical pencil with automatic lead advance
Forming a wellbore casing while simultaneously drilling a wellbore
Method for optimal retrieval of non-volume-specific data
Adjustable multipurpose trunk exerciser