Method of formulating zinc oxide powder blends for balanced UVA/UVB attenuation
US9949904B2 · kind B2 · utility
0Cited by
5References
11Claims
0Family size
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Key dates
| Filing date | Jun 1, 2015 |
| Grant date | Apr 24, 2018 |
| Priority date | — |
| Expiry date | Jun 1, 2035 |
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 UV A 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.