发明授权
- 专利标题： Long term rapid color changing time indicator
- 专利标题（中）： 长期快速变色时间指示器
-
申请号： US197631申请日： 1994-02-10
-
公开(公告)号： US5633835A公开(公告)日： 1997-05-27
- 发明人: David J. Haas , Sandra F. Haas
- 申请人： David J. Haas , Sandra F. Haas
- 申请人地址： NY Suffern
- 专利权人： Temtec, Inc.
- 当前专利权人： Temtec, Inc.
- 当前专利权人地址： NY Suffern
- 主分类号： G04F1/00
- IPC分类号： G04F1/00 ; G07C1/00 ; G07C1/30 ; G07C9/00 ; G09F3/20 ; G04B17/00
摘要：
A time indicator that rapidly changes color after a specific time interval is provided. The time indicator includes a base substrate with colored dye deposited on a first surface; a barrier applied over the colored dye; and a substrate having an adhesive on a first surface thereof. The substrate and the base substrate are put into adhesive contact. The adhesive coacts with the barrier to dissolve the barrier in a specified time interval. The adhesive then contacts the colored dye to dissolve the dye and permit the dye to migrate through the adhesive to cause a color change visible through the substrate.