Protective device
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United States of America Patent
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-
Aug 11, 1998
Grant Date -
N/A
app pub date -
Nov 8, 1995
filing date -
May 10, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The invention relates to a protective device of the type having a body (1) and a filtering unit (10) supported by said body and acting as a visor, said filtering unit being electrically shiftable between at least two light transmitting conditions and comprising, for this purpose, one or more LC cells. The filtering unit (10) is made wholly or at least to a major extent of polymer material and is designed as a panoramic visor which is darkenable over its entire area. Said one or more LC cells are in the form of a foil and extend over the entire area of the panoramic visor. The invention is of special interest for welding helmets with automatically controlled darkening.
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Family
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Cited Art Landscape
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