Patent US3624068A successfully refreshed from Google Patents.
US3624068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Di(carboxylic acid ester)-phenyl-azo-naphthol dyes
Assignee: BASF SE
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Filing: 1968-11-27
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Granted: 1971-11-30
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Expires: 1988-11-27
Abstract
Abstract Acid dyes derived from aminobenzene dicarboxylic acid esters and 1-hydroxy-7-amino-naphthalene-3-sulfonic acid, particularly for dyeing wool or textile material of synthetic linear polyamides.
Inventors
- 👤 Johannes Dehnert
- 👤 Gerhard Gnad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:15
CPC Classifications
C; C09; C09B; C09B29/00; C09B29/10; C09B29/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
6 words
A monoazo dye having the formula
Claim 2
Dependent Claim
5 words
The dye having the formula:
Claim 3
Dependent Claim
5 words
The dye having the formula:
References Cited (Backward Citations)
CH402229A
Cited
US3413280A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |