Wrist watch having certain parts covered with extra hard material
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United States of America Patent
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-
Jun 23, 1987
Grant Date -
N/A
app pub date -
Apr 15, 1986
filing date -
Apr 16, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The watch case of this inveniton includes means for fixing the crystal to the case having surfaces exposed at the exterior of the watch thus susceptible to being scratched. Such visible surfaces are protected by an armour formed essentially of a substrate made from a metallic carbide and a material covering the substrate such material having a hardness greater than 5000 HV.sub.0.25.
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