| 摘要 |
<p>2082062 9119281 PCTABS00008 Signs comprising an outer layer (12) having indicia thereon and a thermal reservoir (16) behind the outer layer. The thermal reservoir (16) contains at least one phase change material that, during periods of falling ambient temperature, yields a latent heat of transition thereby tending to maintain the temperature of the outer layer above what it otherwise would have been. As a result of such higher temperatre, the outer layer of the sign is more resistant to formation of dew or frost thereon and retains a greater degree of legibility.</p> |
