Variable password safety interlock system for microwave ovens and other appliances
US5530230A · kind A · utility
Inventors
Key dates
| Filing date | Oct 20, 1994 |
| Grant date | Jun 25, 1996 |
| Priority date | — |
| Expiry date | Oct 20, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B6/66
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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 us…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.