Food temperature responsive control apparatus
US4035787A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 21, 1975 |
| Grant date | Jul 12, 1977 |
| Priority date | — |
| Expiry date | Oct 21, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D23/24
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Food temperature responsive apparatus for controlling an oven. The apparatus includes a temperature sensing thermistor which may be included in a probe adapted for insertion into food being cooked in an oven. The apparatus includes simplified and effective means, in the form of voltage dividers and comparators, for performing the functions of de-energizing the oven heating means and energizing an audible alarm when interior food temperature reaches a preset temperature, protecting against an open-circuited or a short-circuited condition in a sensing circuit which includes the thermistor, guarding against responding to transient electrical noise, and latching the oven heating means in a de-energized condition once it has been de-energized. Even though the thermistor has a non-linear resistance versus temperature characteristic, the apparatus provides a linear temperature presetting scale and includes a linear temperature presetting potentiometer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.