EP 1645919 B1 20071219 - Cambered watch crystal
Title (en)
Cambered watch crystal
Title (de)
Gewölbtes Uhrglas
Title (fr)
Glace de montre bombée
Publication
Application
Priority
EP 04405636 A 20041011
Abstract (en)
[origin: EP1645919A1] 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
G04D 3/06 (2006.01); B24B 9/08 (2006.01); G04B 39/00 (2006.01)
CPC (source: EP)
G04B 39/00 (2013.01); G04B 39/006 (2013.01); G04D 3/065 (2013.01)
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