Patent US3691187A successfully refreshed from Google Patents.
US3691187A
Expired / Lapsed
US
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Certain benzothiazolyl-coumarins
Assignee: Individual
•
Filing: 1971-04-26
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Granted: 1972-09-12
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Expires: 1991-04-26
Abstract
Abstract Dyes of the formula:
Inventors
- 👤 Gerhard Grau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:54
CPC Classifications
C; C09; C09B; C09B69/00; C09B69/02; C09B69/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
30 words
A dye of the formula defined in claim 1, in which X is hydrogen, sodium, potassium, ammonium, ''''iso-octylammonium'''' oleylammonium, laurylammonium, di-n-butylammonium, di-isobutylammonium, cyclohexylammonium, dicyclohexylammonium, tributylammonium, phenylbenzyl-dimethylammonium, stearylbenzyl-dimethylammonium, benzyl-tri-''''methylammonium'''' or dimethylaminopropylammonium.
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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |