Heated dental mirror
US4568281A · kind A · utility
Inventors
Key dates
| Filing date | Dec 15, 1983 |
| Grant date | Feb 4, 1986 |
| Priority date | — |
| Expiry date | Dec 15, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D23/24
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A self-temperature regulating hermetically sealed dental mirror includes a mirror encasement comprised of an inverted metal cup that contains electronic heating and temperature control components secured in its interior cavity by a heat conductive resin base potting material. The external surface of the closed end of the cup is a light reflective surface that functions as a mirror. The open end of the inverted cup is imbedded in a plastic base that is molded around and sealed to the sides of the cup in such a manner that the potting material and electronic components are completely sealed and not exposed to the exterior. A molded handle extends radially outwardly from the base, and electric wire leads for conducting electricity to the heating components are positioned longitudinally through the handle. A male jack plug is molded into the distal end of the handle for connecting the wire leads to a power source. The electronics is low voltage direct current and includes a wire wound resistor heating element with a posistor controlled transistor switching circuit for temperature control. Alternatively, for relatively lower wattage heating requirements, the low voltage circuit includes…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.