Variable password safety interlock system for microwave ovens an

Details Variable password safety interlock system for microwave ovens an Variable password safety interlock system for microwave ovens an

1994-10-20

1996-06-25

Leung, Philip H.

Electric heating

Microwave heating

With control system

219702, 219720, 219482, 99325, 307142, 380 23, H05B 668

Patent

active

055302300

ABSTRACT:
A new variable password safety interlock system for microwave ovens and other computerized or electrical appliance allows the user to dynamically and automatically generate a new password immediately prior to each use. The variable password comprises some prearranged transposition or combination of numbers of digits that were already entered into the microwave control panel by the user. The user first enters digits representing the microwave time, the target food temperature, the microwave power level, the actual time of day on display or some other required combination of digits or microwave console buttons, and then presses the "Start" button. The new value of the variable password for that use of the microwave will be some prearranged transposition or combination of the digits, numbers or buttons that had just previously been pressed by the user and that appeared on the microwave control panel at the moment the user pressed the "Start" button. Preferably, the password is the digits of the microwave heating time just entered by the user but in reverse order. The password does not require memorization and is easy for the user to compute because the numbers are on display to the user. This password safety interlock is child-proof because a young child will be unable to compute the ephemeral and varying password needed to operate the microwave.

REFERENCES:
patent: 5177789 (1993-01-01), Covert
patent: 5231310 (1993-07-01), Oh
patent: 5331575 (1994-07-01), Koether et al.
patent: 5375508 (1994-12-01), Knepler et al.
patent: 5432851 (1995-07-01), Scheidt et al.

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