# US 12,007,718 B2 · Dial for a timepiece and method for manufacturing the same

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- Number: US 12,007,718 B2
- Document ID: US12007718B2
- Status: Granted
- Kind: B2
- Application number: 16/963,055
- Filed: 2018-03-06
- Published: 2020-11-05
- Granted: 2024-06-11
- Earliest claimed: 2018-02-05
- Assignees: Montres Rado S.A.
- Applicants: Montres Rado SA
- Inventors: Hakim El Kadiri; Thomas Froelicher
- Web page: https://patentgrep.com/patent/US12007718B2

## CPC

- G04B 19/12: Selection of materials for dials or graduations {markings}
- G04B 45/0015: {Light-, colour-, line- or spot-effects caused by or on stationary parts (change of appearance by exchangeable case parts G04B47/046)}
- G04D 3/0048: {for dials (construction thereof G04B19/10, G04B19/12)}
- G04B: MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS (spring- or weight-driven mechanisms in general F03G; electromechanical clocks or watches G04C; electromechanical clocks with attached or built-in means operating any device at pre-selected times or after predetermined time intervals G04C23/00; clocks or watches with stop devices G04F7/08)
- G04D: APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES

## Abstract

A dial for a timepiece includes a support and a mother-of-pearl sheet, the mother-of-pearl sheet having a front face and a rear face facing the support and on which a pattern has been printed. The mother-of-pearl sheet has a thickness between 50 μm and 100 μm so that the pattern printed on the rear face of the mother-of-pearl sheet appears transparently through the mother-of-pearl under normal conditions of illumination.

## Claims

### Claim 1

A dial for a timepiece comprising:
a support;
a mother-of-pearl sheet, the mother-of-pearl sheet having a front face and a rear face facing said support and on which a pattern has been printed;
a sapphire crystal positioned on the front face of the mother-of-pearl sheet; and
a ring provided around a peripheral edge of the mother-of-pearl sheet,
wherein the mother-of-pearl sheet has a thickness of between 140 μm and 160 μm so that the pattern printed on the rear face of the mother-of-pearl sheet appears transparently through the mother-of-pearl under normal conditions of illumination,
wherein the printed pattern is formed by a set of lines of different widths,
wherein the ring has a thickness from 700 μm to 900 μm, and
wherein the support has a thickness from 350 μm to 400 μm.

### Claim 2 (depends on 1)

The dial according to claim 1, wherein the mother-of-pearl is colored.

### Claim 3 (depends on 1)

The dial according to claim 1, wherein the support is metallic.

### Claim 4 (depends on 1)

The method for manufacturing a dial for a timepiece comprising a support and a mother-of-pearl sheet according to claim 1, wherein the method includes the steps of:
a) providing a support
b) providing the mother-of-pearl sheet having a thickness comprised between 140 μm and 160 μm
c) printing a pattern on the rear face of the mother-of-pearl sheet
d) assembling the printed mother-of-pearl sheet obtained in step c) on the support.

### Claim 5 (depends on 4)

The method according to claim 4, wherein the method also includes a step e) of tinting the mother-of-pearl before step c) of printing the pattern.

### Claim 6 (depends on 4)

The method according to claim 4, wherein step c) of printing the pattern is achieved using an ink deposited in accordance with a method chosen from the group comprising silk screen printing, photolithography, and inkjet printing.

### Claim 7 (depends on 4)

The method according to claim 4, wherein the support is metallic.

### Claim 8 (depends on 6)

The method according to claim 6, wherein the ink is deposited in a layer with a thickness comprised between 10 μm and 40 μm.

### Claim 9 (depends on 1)

A timepiece comprising a dial according to claim 1.