Coloured thermocompensated spiral and a method for the production thereof

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United States of America Patent

PATENT NO 11334025
APP PUB NO 20200050148A1
SERIAL NO

16522206

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Abstract

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A method for producing a thermocompensated and coloured coil spring including the steps of forming a first layer of silicon oxide on at least one face of the core and on at least one other face of the core, the first layer having a thickness equal to a fraction of the thickness required for achieving thermal compensation, removing the first layer from at least one face of the core, forming a second layer of silicon oxide on at least one face of the core and on at least one other face of the core, the second layer having a thickness equal to the remaining fraction of the thickness required for achieving thermal compensation which is lower than or equal to 1 μm for giving at least one face of the core a colour as a result of the interference effect.

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Patent Owner(s)

Patent OwnerAddress
NIVAROX-FAR S AAVENUE DU COLLEGE 10 CH-2400 LE LOCLE

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Cusin, Pierre Villars-Burquin, CH 88 284
Gandelhman, Alex Neuchatel, CH 16 26
Kostadinov, Anguel Dombresson, CH 1 0

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