Hydroxyarylquinazolines and their use as uv-absorbers
Abstract
Abstract WHEREIN R1-4 ARE SELECTED FROM H AND OTHER SUBSTITUENTS HAVING HAMMETT PARA SIGMA VALUES OF -0.67 TO +0.78; R5-8 ARE SELECTED FROM H AND OTHER SUBSTITUENTS HAVING HAMMETT PARA SIGMA VALUES OF -0.67 TO +0.25; AND R9 IS SELECTED FROM H AND SUBSTITUENTS, OTHER THAN HYDROXYL, HAVING A HAMMETT PARA SIGMA VALUE OF -0.67 TO +0.25; SAID SUBSTITUENTS, WHEN OTHER THAN A SINGLE HYDROGEN OR HALOGEN ATOM, BEING JOINED TO THE QUINAZOLINE RING THROUGH A CARBON, NITROGEN OR OXYGEN ATOM; AND THE USE OF SUCH COMPOUNDS AS LIGHT SCREENS AND PHOTSTABILIZERS IN PHOTODEGRADATION-PRONE SUBSTRATES. NOVEL ULTRA-VIOLET ABSORBING 2-(O-HYDROXYARYL)QUINAZOLINES OF THE FORMULA 7-R2,8-R1-QUINAZOLINE 2-(2-(HO-),3-R5,4-R6,5-R7,6-R8-PHENYL),4-R9,S-R4,6-R3,
Inventors
- 👤 Jan-Erik Anders Otterstedt
- 👤 Richard Pater
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |