Patent ID: 7335085
Filing Date: 2008-02-26
Classification: A63H,Y10T

Abstract:
1. A handheld amusement and stress relief device formed of a flexible, resilient polymeric material consisting essential of: a center portion with a substantially planar peripheral portion surrounding the center portion; the center portion having a concave first lower surface and a convex first upper surface, the device having two stable equilibrium positions whereby manual manipulation of the device inverts the surfaces between the two stable equilibrium positions, wherein a first stable equilibrium position comprises the first lower surface having a concave shape and the first upper surface having a convex shape and, after inversion, a second stable equilibrium position comprises the first upper surface now having a concave shape and the first lower surface now having a convex shape, wherein the second equilibrium position provides a shape that is substantially the same as the shape of the device in the first equilibrium position and the device will hold the second equilibrium position until manual manipulation returns the device to the first equilibrium position, wherein the thickness t of the center portion is tapered, such that a thickness t