发明名称 |
WATER-FILTER LIFETIME INDICATOR |
摘要 |
An indicator, and method of indicating, the expiration of substantially the predetermined useful life of a water filter, use color change in a simple but very effective manner. The water migrates into a color change mechanism which may include a porous medium, and causes first and second reagents to react producing a color change. The reaction system between the reagents may be selected from the group consisting essentially of chelation of a metal ion by a chelating agent, reaction of an acid/base with a pH indicator, reaction of an electron donor/acceptor with a redox indicator, and an enzymatic reaction between an enzyme and a substrate. The color change mechanism displays a gradual advance of the color change over time, and may incorporate a scale to display the elapsed time. A mask containing scale indicia may be used to relate the progress of the diffusion to substantially the predetermined useful life of the filter. |
申请公布号 |
WO0200552(A2) |
申请公布日期 |
2002.01.03 |
申请号 |
WO2001US18870 |
申请日期 |
2001.06.13 |
申请人 |
INNOVA/PURE WATER, INC.;PROFILE SOL-GEL LTD. |
发明人 |
KAGAN, MICHAEL, L.;MIERAU, BRADLEY, D.;REID, HENRY, C. DI;NOHREN, JOHN, E., JR. |
分类号 |
C02F1/00;G04F1/00;G04F1/06 |
主分类号 |
C02F1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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