Evaluation of the state of change of keratin fibers
US4353708A · kind A · utility
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21Claims
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Key dates
| Filing date | Jul 6, 1979 |
| Grant date | Oct 12, 1982 |
| Priority date | — |
| Expiry date | Jul 6, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/18
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A process for evaluating the ionic state of the surface of keratin fibers, especially human hair, which comprises, taking at least one sample of fibers from the fibers to be evaluated, contacting the sample with an acidic solution of at least one acidic basic dyestuff, assessing what, if any, change in the color of the solution has taken place and attributing the ionic state to the surface of the fibers accordingly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.