Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
March 20, 2007
Patent Application Number
10901111
Date Filed
July 29, 2004
Patent Primary Examiner
Patent abstract
A plate spring of a substantially circular-ring-shaped form having a substantially externally conical upper side (12) and a substantially internally conical underside (13) between which there are positioned an outer annular edge (14) and an inner annular edge (15), wherein, in the unloaded condition, the surface layer (17) of the underside (13) comprises a higher inherent compressive stress than the surface layer (16) of the upper side (12).
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