Title (en)

Cambered watch crystal

Title (de)

Gewölbtes Uhrglas

Title (fr)

Glace de montre bombée

Publication

EP 1645919 A1 20060412 (FR)

Application

EP 04405636 A 20041011

Priority

EP 04405636 A 20041011

Abstract (en)

The crystal has a convex upper face (10) and a concave lower face (12), each presenting a bend radius (RS1, RI1), along 12 hours-6 hours axis, and another bend radius, along 3 hours-9 hours axis. The radiuses are such that the crystal has a constant thickness (e). The crystal is in rectangular, oval or barrel form, and is made of a hard crystalline transparent mineral material such as sapphire, spinel or ruby. An independent claim is also included for equipment for multipart machining of the convex upper face of a watch crystal.

IPC 8 full level

B24B 9/08 (2006.01); G04B 39/00 (2006.01); G04D 3/06 (2006.01)

CPC (source: EP)

G04B 39/00 (2013.01); G04B 39/006 (2013.01); G04D 3/065 (2013.01)

Citation (search report)

• [X] GB 371451 A 19320425 - BAKELITE CORP
• [X] EP 0443366 A1 19910828 - RADO MONTRES SA [CH]
• [X] GB 365499 A 19320121 - ERNEST MORF
• [X] CH 220796 A 19420430 - SCHMITZ WERNER [CH]
• [X] US 2228670 A 19410114 - MULERONE WALTER L
• [DX] WO 9815876 A1 19980416 - STETTLER HANS AG [CH], et al
• [A] CH 38606 A 19071115 - JORNOD E [CH]

Designated contracting state (EPC)

CH FR GB LI

DOCDB simple family (publication)

EP 1645919 A1 20060412; EP 1645919 B1 20071219; HK 1089822 A1 20061208

DOCDB simple family (application)

EP 04405636 A 20041011; HK 06110238 A 20060915