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
Light-source control device, light-source control method, image reading device, and image forming apparatus
Managing a spinlock indicative of exclusive access to a system resource
Fine grain voltage scaling of back biasing
Hand-held optical probe based imaging system with 3D tracking facilities
Label printer
Systems, devices, methods, and compositions including fluidized x-ray shielding compositions
Semiconductor device and method of adjusting characteristic thereof
  Randomly Featured Patents
Fat impervious foils and coatings
Three axis earth/star sensor
Remote media call center
Polymerizable hybrid monomers
Gravity stable surfactant flooding in gas depleted reservoirs
At-cut crystal oscillating reed and method of etching the same
Valve train with variable cam phaser
Grinding agent based and/or copolymers for aqueous suspension of coarse mineral materials for pigment applications
Night vision instrument with electronic image converter
Partially crosslinked ethylene vinyl acetate copolymers with low melt index values and increased tensile strength