Method of formulating zinc oxide powder blends for balanced UVA/UVB attenuation
US9072918B2 · kind B2 · utility
1Cited by
5References
25Claims
0Family size
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Key dates
| Filing date | Dec 4, 2008 |
| Grant date | Jul 7, 2015 |
| Priority date | — |
| Expiry date | Mar 19, 2032 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K2800/413
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Disclosed is a composition that comprises an effective proportion of a first metal oxide powder having a primary particle size and a secondary particle size selected for the first metal oxide powder to attenuate UVA and an effective proportion of a second metal oxide powder having a secondary particle size selected for the second metal oxide powder to attenuate UVB. The mean secondary particle size of the first metal oxide powder is greater than the mean secondary particle size of the second metal oxide powder. In one embodiment, the first and the second metal oxide powders are both zinc oxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.