Method for determination of realistic UV protection factors or broad spectrum indices
US6820014B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2002 |
| Grant date | Nov 16, 2004 |
| Priority date | — |
| Expiry date | Mar 15, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/59
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The invention relates to a new method for determination of realistic UV protection factors or bread spectrum indices of a sunscreen preparation. Realistic UV protection factors are calculable by determination of the theoretical and the experimental UV absorbances of known UV filters in wavelength steps of about 5 nm in the range of 290-400 nm from a definite basic formulation (emulsion, gel etc.) and on a transparent substrate and introducing of the values in a mathematical model. These factors are in conformity with values measured in vivo. The number of the experiments for developing new formulations are significant reduced because only basic formulation, kind and concentration of the filters have to enter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.