Back to results
US 5,025,426 AGranted
Reminder apparatus
AssigneeY. M. Shoval Ltd.
InventorsShlomo Blumberg, Avraham Olti
Life of this patent
Estimating the term…
Abstract
Reminder apparatus to be carried by a user with a key constructed to remind the user as to the last operation in which the key was used with respect to a lock. The key includes an operation sensor which stores the time of the last key operation, and a display which, upon manual operation of the key, displays the time of the last key operation.
Claims17
Reminder apparatus to be carried by a user with a key to remind the user as to the last operation in which the key was used with respect to a lock, comprising:
- a real time clock for measuring time;
- an operation sensor for sensing the time of the last key operation in which the key was used with respect to the lock;
- a memory for storing the time of the last key operation as sensed by the sensor;
- a display;
- a manually-operable member;
- and
- a control circuit effective, upon manual operation of said latter member, to display in said display the time of the last key operation as stored in said memory.
4 more elements
Reminder apparatus comprising:
- a transmitter unit adapted to be secured to a door having a lock and to transmit a signal;
- a receiver unit adapted to be carried by person with a key to be used for locking and unlocking the lock, the receiver unit receiving said signal from the transmitter;
- an audible signalling device;
- a circuit means for actuating said audible signalling device when said receiver unit is located more than a predetermined distance from said transmitter;
- said receiver unit including disabling means for disabling said audible signalling device when the door has been locked.
2 more elements
Dependencies are inferred from the claim text.