US3766199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of 3-benzimidazolyl-coumarins as fluorescent compounds
Assignee: BASF SE
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Filing: 1971-02-03
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Granted: 1973-10-16
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Expires: 1991-02-03
Abstract
Abstract MANUFACTURE OF 3-BENZIMIDAZOYL-COUMARINS COMPRISING THE CONDENSATION OF AN O-HDROXYBENZALDEHYDE OR OHYDROXYNAPHTHALDEHYDE WITH A 2-CYANOMETHYLBENZIMIDAZOLE IN ACIDIC MEDIUM. THE PRODUCTS ARE USEFUL AS FLUORESCENT DYES.
Inventors
- 👤 J Dehnert
- 👤 G Grau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:17
CPC Classifications
C; C07; C07D; C07D235/00; C07D235/02; C07D235/04; C07D235/06; C07D235/16; C09; C09B; C09B23/00; C09B23/10; C09B23/102
Claims Analysis
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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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |