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| US4212153 | 7 Feb 1978 | 15 Jul 1980 | Herculite Protective Fabrics Corporation | Time color indicator |
| US4229813 | 26 Jun 1978 | 21 Oct 1980 | Akzona Incorporated | Elapsed time indicator |
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| US7294379 | 7 Mar 2003 | 13 Nov 2007 | Avery Dennison Corporation | Color changing device for time indicating label and methods of making and using the same |
| US7434535 | 31 Dic 2003 | 14 Oct 2008 | Church & Dwight Co., Inc. | Timing device |
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Nippon Paper Papylia Company, Limited | Period indicator |
| US7829181 | 31 Ago 2005 | 9 Nov 2010 | Kimberly-Clark Worldwide, Inc. | Solvatochromic visual indicator and the use of the same |
| US8056498 | 25 Ene 2011 | 15 Nov 2011 | Brady Worldwide, Inc. | Inspection and testing indicator |
