Reminder apparatus
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United States of America Patent
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-
Jun 18, 1991
Grant Date -
N/A
app pub date -
Jun 29, 1990
filing date -
Nov 18, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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