| 摘要 |
<p>A timing device (100) for visually indicating the passage of a duration of time is disclosed. The timing device (100) comprises a lens (101), a base (105) and an optical medium (103) therebetween. The optical medium (103) preferably comprises one or more materials, layers or components that chemically or electrochemically change the duration of time. The timing device (100) preferably comprises an opaque layer (204) positioned between the lens and the base, wherein the opaque layer is dissolved over the duration of time, thereby making the base visible through the lens. The timing device (100) is preferably fabricated in parts with reactive regions which are configured to couple together to form an activated device. In further embodiments of the invention, the device (100) comprises means to generate an audible signal when the duration of time has passed and/or thermosensor for actuating the device (100) within a range of temperatures.</p> |
