Printed wiring board means with integral dew sensor
US4598333A · kind A · utility
6Cited by
8References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 12, 1985 |
| Grant date | Jul 1, 1986 |
| Priority date | — |
| Expiry date | Sep 12, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H35/42
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electronic control device utilizes a plurality of conductive areas on an associated printed wiring board to create integral dew sensors. The dew sensors are created by providing parallel conductive surfaces that are connected in turn by a resistor to a high impedance switch in the form of the gate of a field effect transistor. In the event that moisture vapor or dew is present in the control device, a conductive path is created that causes the control device to shut down in a safe or alternate mode from the normal mode of operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.