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
Parallel processing computer systems with reduced power consumption and methods for providing the same
Generalized AC-DC synchronous rectification techniques for single- and multi-phase systems
Vehicle having power supply apparatus
Carbonate and carbamate modified forms of glucocorticoids in combination with .beta..sub.2 adrenergic agonists
Node and wireless sensor network comprising the node
Powder pulverising device
Organic light emitting diode light source device
  Randomly Featured Patents
Method and apparatus for blank detection of an optical disc
Magnetic tape cassette
White light emitting device and method of making same
Information appliance unit with a fold open integral display
Isomerization of bisphenols
Method for making a steering wheel
Arrangement for measuring the relative distance of closely adjacent objects
Diagnosis control valve unit for evaporation purge system
Method of manufacturing a semiconductor device having nitrogen-bearing oxide gate insulating layer
4-oxa and 4-thia steriods