Coded locking device, more especially with keyboard

Details Coded locking device, more especially with keyboard Coded locking device, more especially with keyboard

1986-07-17

1989-09-26

Weldon, Ulysses

Communications: electrical

Continuously variable indicating

With meter reading

70278, 34082534, H04Q 100

Patent

active

048704113

ABSTRACT:
In a coded locking device, unlocking of which is controlled by composing any one of two separate codes, namely a code in use known by entitled users and a responsible person or "first code x" and a secret code or "second code y", able to be derived from the first code x by a particular law known only to the responsible person, the first composition of the second code y automatically ensures unlocking of the device and, in a way sufficiently postponed for the users to become acquainted with it, the three following operations: invalidation of the first code x, adoption by the device of the second code y as new first code, sensitization of the device to a third code z derived from the preceding second code y by the above low, this third code z serving as the new second code.

REFERENCES:
patent: 3796889 (1974-03-01), Fradkin et al.
patent: 3906447 (1975-09-01), Crafton

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