Device for measuring the force required to untangle hair
US3946606A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1973 |
| Grant date | Mar 30, 1976 |
| Priority date | — |
| Expiry date | Nov 15, 1993 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L5/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Device for measuring the force required to untangle hair comprises a handle, a carding member mounted for pivotal movement about the axis of said handle, and a counter for measuring the sum of the amplitudes of successive pivotal movements of said carding member relative to said handle. PAC SUMMARY OF THE INVENTION In order to compare the characteristic properties of cosmetic products such as shampoos for example, it is often necessary to compare the property of being more or less easily entangled which they impart to the hair, regardless of the form of the hair itself, whether it consists of locks, wigs, or a head of hair. It is clear that the more the application of a product or composition facilitates untangling, for example, after shampooing, the more advantageous the use of this product or composition is in practice. Up to the present it has been impossible to evaluate the property of facilitating the untangling of hair in other than a subjective manner and this has made it difficult to carry out comparisons. In order to eliminate one source of errors resulting from differences in the nature of hair from one head to another in the case of a head of hair, and differences in the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.