Microwave heating device with constant temperature control of the magnetron
US4517430A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 10, 1983 |
| Grant date | May 14, 1985 |
| Priority date | — |
| Expiry date | May 10, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B2206/046
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A heating device for use in laboratories and the like comprising an oven housing having a magnetron tube, power control circuitry for the magnetron tube, a timer for determining an amount of pulse power for the magnetron tube, a settable heating time switch with display, a settable venting time switch and display, and magnetron tube resistance heating structure directly, physically attached thereto with thermostatic control therefore for accurately, and by a predetermined amount, heating the magnetron tube prior to operation of the overall heating device. Because the temperature of the magnetron tube is very accurately maintained all of the changeable operating controls for the magnetron respond predictably and with a high degree of accuracy, and therefore when the heating device is used in laboratory applications for heating and drying a plurality of samples individually, each sample can be predeterminedly heated and dryed in a predicable manner like the previous samples. By using percentage of power switches and circuitry together with a variable pulse power control, the overall heating can be accurately controlled and predicted for small samples, medium size samples, and very la…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.