US4091021A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azo dyestuffs
Assignee: Imperial Chemical Industries Ltd
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Filing: 1976-03-18
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Granted: 1978-05-23
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Expires: 1996-03-18
Abstract
Abstract Azo dyestuffs, which in the acid form, are represented by the formula: A -- N ═ N -- M -- N ═ N -- E (1) wherein A is an aromatic radical, M is a 1,4-benzene radical which may be substituted, E is the residue of a coupling component which is free from azo groups, At least one of A and M containing a phosphonic acid group, and the metal complexes of those having a metallisable group are reactive dyes suitable for use in the process of German OLS No. 2324809.
Inventors
- 👤 Herbert Francis Andrew
- 👤 David William Crichton Ramsay
- 👤 Cecil Vivian Stead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:26
CPC Classifications
C; C09; C09B; C09B43/00; C09B43/12; C09B43/124; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3834; C09B31/00; C09B31/02; C09B31/025; C09B43/11; C09B45/00; C09B45/02; C09B45/24; C09B45/34; C09B45/36; C09B45/38; C09B67/00; C09B67/0071; C09B67/0072; C09B69/00; C09B69/007; C09B69/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
86 words
An azo dyestuff having the formula A--N═N--M--N═N--E wherein A is a benzene radical having a phosphonic acid group and optionally containing a further substituent selected from the group consisting of methyl, chlorine, methoxy and nitro, M is a 1,4 phenylene radical optionally containing up to 2 substituents selected from the group consisting of methyl, methoxy, phosphonomethyl, acetylamino and carboxylic acid, and E is the residue of a coupling component selected from the group consisting of naphthol sulphonic acid, aminonaphthol sulphonic acid and lower alkanoylaminonaphthol sulphonic acid.
Claim 2
Dependent Claim
86 words
An azo dyestuff having the formula A--N═N--M--N═N--E wherein A is a benzene radical having a phosphonic acid group and optionally containing a further substituent selected from the group consisting of methyl, chlorine, methoxy and nitro, M is a 1,4 phenylene radical optionally containing up to 2 substituents selected from the group consisting of methyl, methoxy, phosphonomethyl, acetylamino and carboxylic acid, and E is the residue of a coupling component selected from the group consisting of naphthol sulphonic acid, aminonaphthol sulphonic acid and lower alkanoylaminonaphthol sulphonic acid.
Claim 3
Dependent Claim
25 words
Azo dyestuffs as claimed in claim 1 wherein A is a benzene nucleus carrying a phosphonic acid group in meta position to the azo group.
Claim 4
Dependent Claim
16 words
Azo dyestuffs as claimed in claim 1 which are in the form of the ammonium salt.
Claim 5
Dependent Claim
30 words
Azo dyestuffs as claimed in claim 1 which are partly in the form of the free acid or ammonium salt and partly in the form of an alkali metal salt.
Claim 6
Dependent Claim
18 words
Aqueous preparations containing an azo dyestuff as claimed in claim 1 in the form of an alkanolamine salt.
Claim 7
Dependent Claim
19 words
The azo dyestuff of claim 1 having the formula ##STR14## and being in the form of the ammonium salt.
References Cited (Backward Citations)
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US3755290A
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US3202550A
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US3640994A
Cited
US3635944A
Cited
US3828020A
Cited
US3947435A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-22 | 1981-11-21 | 1982-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-22 | 1985-11-21 | 1986-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-22 | 1989-11-21 | 1990-05-23 | $7700.00 | Window Closed / Lapsed |