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US 6,111,821 AGranted
Transparent and scratchproof watch crystal and watch case fitted with such a crystal
AssigneeMontres Rado S.A.
InventorMichael Bach
Life of this patent
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Abstract
A transparent and scratchproof watch crystal, characterized in that it is made of polycrystalline diamond. The invention also concerns a watch case fitted with such a watch crystal.
Claims9
A transparent and scratchproof watch crystal made of polycrystalline diamond.
A method of providing a watch crystal comprising:
- making the crystal of transparent polycrystalline diamond;
- and installing the crystal in a watch case.
The use of transparent polycrystalline diamond as a watch crystal having a thickness of between 0.5 and 2 mm.
Dependencies are inferred from the claim text.