Thomson-csf

Pierre Merenda

Jean C Reymond

Francois Buchy

Jean Pierre D'Haenens

A device possessing three conduction states comprises two electrodes connected with one another through the agency of a compound in the form C.sub.x H.sub.y in which there are held in suspension particles of vanadium oxide, VO.sub.2, the proportion by volume being of the order of 7%.

Three conductivity state circuit element

A lamp for installation in the flashers or winkers of motor vehicles, with a flasher device integrated into the lamp itself, is provided. The flashing is produced, in the case of the invention, by the utilization of substances which exhibit a sudden change in resistivity at a certain temperature. This is the case with powdered V O.sub.2 when formed into an aglomerate by the use of an organic binder. A block assembled in the bulb of the lamp and in electrical parallel with the filament, does not effect the incandescent state of the latter as long as a temperature of 68.degree. C is not exceeded, but effectively short-circuits the filament beyond this temperature. In this fashion, successive extinctions and relightings take place by a process of relaxation. In the case of a C.sub.36 H.sub.74 wax filled with conductive powder, the phenomena are reversed and the block must be connected in series with the filament.

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Paris, France

Pierre Merenda