Assessment of the state of change of keratin fibers
US4421859A · kind A · utility
4Cited by
1References
25Claims
0Family size
Assignee
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Key dates
| Filing date | Jun 18, 1981 |
| Grant date | Dec 20, 1983 |
| Priority date | — |
| Expiry date | Jun 18, 2001 |
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 or 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.