US3709896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
1,4-bis-(benzoxazolyl-(2'))-naphthalene derivatives
Assignee: Hoechst AG
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Filing: 1970-09-29
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Granted: 1973-01-09
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Expires: 1990-09-29
Abstract
Abstract 1,4 - BIS-(BENZOAXAZOLYL-(2''))-NAPHTHALENES HAVING CARBOXY OR CARBOXYLIC ACID ESTER GROUPS ON THE BENZOAXAZOLE GROUP, WHICH COMPOUNDS ARE EXCELLENT OPTICAL BRIGHTENERS, ESPECIALLY FOR POLYAMIDES AND POLYESTERS.
Inventors
- 👤 H Behrenbruch
- 👤 H Frischkorn
- 👤 U Pintschovius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:33
CPC Classifications
C; C07; C07D; C07D263/00; C07D263/52; C07D263/62; C07D263/64
Claims Analysis
Total Claims: 0
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References 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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |