US 12,235,609 B2
Exterior part for a timepiece or piece of jewelry
Peter Gschwind, Morat (CH); and Alain Beuret, Rossemaison (CH)
Assigned to GROUPE ACHOR SA, Delemont (CH)
Appl. No. 17/440,244
Filed by GROUPE ACHOR SA, Delemont (CH)
PCT Filed Mar. 20, 2020, PCT No. PCT/EP2020/057849
§ 371(c)(1), (2) Date Sep. 17, 2021,
PCT Pub. No. WO2020/188102, PCT Pub. Date Sep. 24, 2020.
Claims priority of application No. 365/19 (CH), filed on Mar. 20, 2019.
Prior Publication US 2022/0179362 A1, Jun. 9, 2022
Int. Cl. G04B 19/12 (2006.01); A44C 5/02 (2006.01); A44C 27/00 (2006.01); C03B 23/207 (2006.01); C03B 25/02 (2006.01); C03B 29/02 (2006.01); C03C 25/002 (2018.01); G04B 19/04 (2006.01); G04B 37/22 (2006.01); G04D 3/00 (2006.01)
CPC G04B 19/12 (2013.01) [A44C 5/02 (2013.01); A44C 27/001 (2013.01); C03B 23/207 (2013.01); C03B 25/02 (2013.01); C03B 29/02 (2013.01); C03C 25/002 (2013.01); G04B 19/042 (2013.01); G04B 37/225 (2013.01); G04D 3/0048 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method of manufacturing an exterior part for a timepiece or a piece of jewelry made from Murano glass, said method comprising the following steps:
providing a material formed by glass rods, arranged side by side,
applying a multi-cycle heat treatment to consolidate the material and form a blank,
machining the blank to produce the exterior part, wherein the heat treatment includes a first cycle (a) wherein the material is heated from a first temperature less than or equal to 100 C to a second temperature of between 500 and 600° C. at a heating rate of between 4 and 12° C./min.