Sulfam(na)phthaleins
US4204061A · kind A · utility
2Cited by
1References
45Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 23, 1977 |
| Grant date | May 20, 1980 |
| Priority date | — |
| Expiry date | Sep 23, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C8/48
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
This invention relates to phenol sulfam(na)phthaleins possessing a ##STR1## wherein R is selected from methyl, unsubstituted or substituted with one or two halo groups and phenyl, unsubstituted or substituted with alkyl, dimethylamino or nitro substituted on the N atom of the sulfam(na)phthalein ring, which compounds find utility as photographic optical filter agents and filter agent precursors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.