Wrist watch having certain parts covered with extra hard materia

Details Wrist watch having certain parts covered with extra hard materia Wrist watch having certain parts covered with extra hard materia

1986-04-15

1987-06-23

Roskoski, Bernard

Horology: time measuring systems or devices

Cases

Of particular material

368286, 368294, 368295, 368282, G04B 3700

Patent

active

046748920

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.

REFERENCES:
patent: 3242664 (1966-03-01), Lederrey
patent: 3931704 (1976-01-01), Tominaga et al.
patent: 4544284 (1985-10-01), Geiger et al.

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