Heating pad controller with multiple position switch and diodes
US6884973B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 9, 2002 |
| Grant date | Apr 26, 2005 |
| Priority date | — |
| Expiry date | Dec 12, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B1/0294
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A control circuit for a heating pad. The control circuit includes a two-pole, four-position slide switch. The four positions of the two-pole, four-position slide switch include off and three different heat settings of the heating pad. The control circuit also includes three heat setting indicators that are alternatively illuminated when the switch is in the three different heat settings. Diodes are used to direct electrical currents through the indicators as appropriate. The diodes and the two-pole, four-position slide switch are arranged so that current may be appropriately flow through, or may be blocked from flowing through, the indicators when the two-pole, four-position slide switch is in each of the three heating settings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.