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Variable password safety interlock system for microwave ovens and other appliances

  • US 5,530,230 A
  • Filed: 10/20/1994
  • Issued: 06/25/1996
  • Est. Priority Date: 10/20/1994
  • Status: Expired due to Fees
First Claim
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1. In a method for operating a microwave oven having processing means and having a control panel with a numeric display means, digit keys and a start key, the improvement comprising a variable password safety interlock procedure comprising the steps of:

  • pressing by a user of digit keys for digits representing a control instruction for heating an object in said microwave oven;

    displaying on said numeric display means said digits representing said control instruction for heating said object in said microwave oven as entered by said user;

    pressing by said user of said start key for a first time;

    composing a variable password value by said processing means using only said digits representing said control instruction as entered by said user or said digits displayed on said numeric display means;

    entering by said user of a usage password value using only the digit keys for said digits displayed on said numeric display means;

    pressing by said user of said start key for a second time; and

    verifying by said processing means that said usage password value entered by said user is identical to said variable password value composed by said processing means;

    whereby said processing means enables said microwave oven to operate if said usage password value entered by said user is identical to said variable password value composed by said processing means, and said processing means disables said microwave oven from operating if said usage password value entered by said user is not identical to said variable password value composed by said processing means.

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