Patent ID: 7450475

Claim:
An elapsed time indicator comprising: a see-through region having a plurality of windows, wherein the windows are congruently shaped and are arranged at a uniform angular distance from one another; and a solid disc arranged below the see-through region including a plurality of adjacent radial sectors, wherein at least two adjacent radial sectors contain different indicia, wherein either the solid disc is rotatable and the see-through region is connected to a dial plate or the see-through region is rotatable and the solid disc is connected to the dial plate, and further wherein each adjacent radial sector is approximately the width of a window, and wherein the plurality of windows of the see-through region is arranged such that relative rotation between the solid disc and the see-through region effects a simultaneous change of the indicia appearing in the plurality of windows of the see-through region, and wherein the indicia appearing in the plurality of windows as a result of the relative rotation between the solid disc and the see-through region are the same indicia.