Patent ID: 7901129

Claim:
Sealed wrist watch case comprising: a protective casing surrounded by a middle and a bezel, the protective casing including a glass, a bottom and a side ring, wherein the side ring has an upper surface bearing directly on a planar bearing surface of a peripheral surface of the inner face of the glass, wherein the protective casing includes a pressure resistant structure defined by (i) at least an annular portion of the planar bearing surface of the glass, said annular portion having a radial width, and (ii) at least an annular portion of the casing, said annular portion of the casing including an annular portion of the side ring and an annular portion of the bottom, said annular portion of the casing having a cross section in a radial plane, said cross section having (a) a radial width which is the same as the radial width of the annular portion of the planar bearing surface and (b) parallel lateral sides perpendicular to the bearing surface of the glass and extending without a gap from the glass to a lower face of the casing, and means for securing and sealing the glass, bottom and side ring of the casing, wherein the glass and the bottom are made of materials each having a Young's modulus >100 000 MPa and a flexural strength >500 MPa, and a material of the side ring has a Young's modulus >100 000 MPa and a compressive strength >500 MPa.