Benzalphthalides and broad spectrum sun screens
US4333920A · kind A · utility
4Cited by
13References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 24, 1979 |
| Grant date | Jun 8, 1982 |
| Priority date | — |
| Expiry date | May 24, 1999 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61Q17/04
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Compositions containing a benzalphthalide, i.e. benzalphthalide or a substituted benzalphthalide, are very effective broad spectrum sun screens. They are prepared by reacting substituted or unsubstituted phthalic anhydride with the corresponding substituted or unsubstituted phenyl acetic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.