Abstract: A low-cost switch sensor remote dead bolt status indicator includes a switch sensor within a key body of a door key which starts a sensor at a door lock location upon sensing of a dead bolt entering into a locked position. The sensor is provided with a self shut-off feature operating after a fixed duration of minutes length has elapsed. The indicator also includes a receiver in the hand held key, which is capable of receiving signals from the sensor after the user presses an inquiry button on its surface. The hand held key has two indicators for alternately displaying the lock's dead bolt status as being locked or unlocked.

Abstract: A low-cost switch sensor remote dead bolt status indicator includes a switch sensor within a key body of a door key which starts a sensor at a door lock location upon sensing of a dead bolt entering into a locked position. The sensor is provided with a self shut-off feature operating after a fixed duration of minutes length has elapsed. The indicator also includes a receiver in the hand held key, which is capable of receiving signals from the sensor after the user presses an inquiry button on its surface. The hand held key has two indicators for alternately displaying the lock's dead bolt status as being locked or unlocked.

Abstract: A dead bolt lock reminder system includes a dead bolt lock mechanism including a dead bolt for mounting in a door to be secured in a closed door state and a transmitter subsystem constructed for positioning proximate the deadbolt lock mechanism and which further includes a transmitter and a detector. The detector is configured for detecting when the dead bolt is moved from a locked state position to an unlocked state position and from an unlocked state position to a locked state position and where the transmitter is configured for transmitting a dead lock reminder signal identifying that a state of the dead bolt has changed to one of locked and unlocked upon detection of same by the detector. A hand held receiver subsystem is configured to receive the dead lock reminder signal at a time of transmission, and maintain a status of a last change to a locked or an unlocked state for displaying to a user of the hand held receiver subsystem.

Abstract: A low-cost switch sensor remote dead bolt status indicator includes a switch sensor which starts a transmitter at a door lock location upon sensing of a dead bolt entering into a locked position. The transmitter is provided with a self shut-off feature operating after a fixed duration of minutes length has elapsed. The indicator also includes a receiver in a hand held unit, such as a key fob capable of receiving signals from the transmitter after the user presses an inquiry key on its surface. The hand held receiver having two indicators for alternately displaying the lock's dead bolt status as being locked or unlocked. In an alternate embodiment, the switch sensor is provided as an integral part bonded to the conventional manufactured metal strike plate dead bolt frame that is typically attached to the door jamb.

Abstract: A deadbolt lock reminder system includes a normally closed deadbolt detector switch which supplies power to a proximity detector to detect a presence of a person in a vicinity of a door whenever the dead bolt is detected not to be in a locked position. When the person leaves the vicinity of the door, the proximity detector switches into a “person no longer detected” mode thereby triggering an alarm. The sounding of the alarm will remind the person to return to lock the dead bolt. The alarm sounds for a fixed duration while the person is still within earshot of the alarm.