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
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申请号: US197631申请日: 1994-02-10
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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.