Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Method for manufacturing thin film transistor and method for manufacturing display device
Semiconductor memory device and method for driving the same
Method and apparatus for controlled reoxygenation
Lifting apparatus
Oil extractor and the preparation method thereof
Satellite fleet deployment
Compositions of PD-1 antagonists and methods of use
  Randomly Featured Patents
Adjustable check valve for use in an oxygen regulator
Drag mold release mechanism
Powder container and image forming apparatus for causing restraining portion to contact restrained portion
Suction disc mounting arrangement
Sewing machine drive motor control system
Fuel supply and cold start apparatus for an internal combustion engine
Intake heating device of an internal combustion engine
Non oxidizing polymeric medical implant
Apparatus and method for accepting return of unused medical items
Strap adjuster