Piece of jewellery, for example a time-piece case, having...

Details Piece of jewellery, for example a time-piece case, having... Piece of jewellery, for example a time-piece case, having...

A - Human Necessities

44

C

117/100, 117/61

A44C 27/00 (2006.01) C23C 16/04 (2006.01) C23C 16/32 (2006.01) C23C 16/34 (2006.01) C23C 16/36 (2006.01) C23C 16/38 (2006.01) C23C 16/42 (2006.01) C23C 30/00 (2006.01) G04B 37/22 (2006.01)

Patent

CA 1061195

ABSTRACT Objects including jewellery, for example watch-cases, having vari- ously coloured surface areas formed by hard materials of different composi- tions. The hard materials are mainly carbides, carbo-nitrides, nitrides, silicides or borides of metals of groups III to VI of the periodic system. The coloured objects of this invention are more scratch and abrasion-proof than known objects produced by coating a base metal with a metal such as titanium and oxidizing in zones under different conditions.

203056

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