Claims for Patent # 5477041

What is claimed:

1. In a locking system of the type comprising:

a lock including a lock means to place the lock in a locked or unlocked condition,

a microcomputer including memory,

a plurality of keys of different types, each key having a key code stored thereon,

said memory having a control program stored therein for program control of said microcomputer,

a key reader coupled with said microcomputer and being adapted to coact with any one of said keys to read the key code stored thereon into said microcomputer,

and an electrically controlled actuator for said locking means coupled with an output of said computer,

the improvement comprising:

said plurality of keys including a selected key having a valid day code stored thereon indicative of which days of the week the selected key will be operative to unlock said locking means independent of the remaining keys,

said lock including clock means for producing a clock signal indicative of real time, and said memory means including a timing register for storing real time and day based on said clock means,

said microprocessor operating under program control for receiving said valid day code from said selected key and for comparing same with said timing register to allow operation of said lock means when said valid day code has a predetermined relation to the day stored in said timing register and to prevent operation of said lock means when said valid day code does not have the predetermined relation to said day stored in said timing register such that the selected key designates valid days of operation allowing different keys to designate and operate on different days.

2. A system as set forth in claim 1 wherein said memory includes a level storage area having a plurality of records identified by lock level code for storing operational information for a lock level associated with said selected keys, and a key storage area having a plurality of lock key records each identified by a lock record number and associated with at least one of said lock levels for storing key information associated with said record number, each of said lock key records including said lock record number and said current key time,