发明授权
- 专利标题： Indicator
- 专利标题（中）： 指示符
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申请号： US09051200申请日： 1998-04-03
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公开(公告)号： US06814909B1公开(公告)日： 2004-11-09
- 发明人: Tadashi Sakurai , Takanori Kume , Tatsuhiro Nagamatsu , Tsuyoshi Moriguchi , Miya Nakayama
- 申请人： Tadashi Sakurai , Takanori Kume , Tatsuhiro Nagamatsu , Tsuyoshi Moriguchi , Miya Nakayama
- 主分类号： B29C6500
- IPC分类号： B29C6500
摘要：
An indicator comprising a porous resin material, and a liquid retained in the pores of the porous resin material, in which the whiteness of the porous resin material is at least 80, and the whiteness of the porous resin material is at least 20 larger than that of the indicator. This indicator displays information such as a period through the change of a color tone, and the like, well maintains the displaying properties, and suffers from less variation of displayed periods.
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