Patent US3948879A successfully refreshed from Google Patents.
US3948879A
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Phenylazonaphtholsulfonic acids having a substituted anilino group in the 6-position of the naphthalane ring
Assignee: Sandoz AG
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Filing: 1973-07-11
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Granted: 1976-04-06
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Expires: 1993-07-11
Abstract
Abstract Compounds of the formula ##SPC1## Wherein EACH OF R and R 1 independently is halo, R 2 is hydrogen or halo, R 3 is halo or --OR 4 , and R 4 is alkyl or substituted alkyl, And chromium complexes thereof. The monoazo compounds are particularly useful for dyeing natural and synthetic polyamide fibers by producing a chromium complex thereof on the fiber by treating the fiber with 2 moles of the monoazo compound and simultaneously or subsequently treating the fiber with 1 to 2 moles of a chromium-donating compound.
Inventors
- 👤 Jacky Dore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:58
CPC Classifications
C; C09; C09B; C09B29/00; C09B29/24; C09B29/28; C09B29/30; C09B29/0003; C09B29/0007; D; D06; D06P; D06P3/00; D06P3/02; D06P3/04; D06P3/046
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
14 words
A compound of the formula ##SPC8## wherein R 5 ' is methyl or ethyl.
Claim 2
Dependent Claim
14 words
A compound of the formula ##SPC8## wherein R 5 ' is methyl or ethyl.
Claim 3
Dependent Claim
10 words
The compound according to claim 1 having the formula ##SPC9##
Claim 4
Dependent Claim
10 words
The compound according to claim 1 having the formula ##SPC10##
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |