Water-triggered coloring or color changing indicator
US8557894B2 · kind B2 · utility
6Cited by
2References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 17, 2009 |
| Grant date | Oct 15, 2013 |
| Priority date | — |
| Expiry date | Feb 17, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31971
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An ink formulation that includes a reversible color-developing complex formed from a dye precursor molecule having a triarylmethane derivative structure modified with a leaving-group (L) that disassociates from said dye precursor when subjected to environmental conditions of either a neutral or acidic pH value is described. Also the invention pertains to diagnostic indicators or absorbent personal care products that have the ink formulation applied to at least a part of the product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.