US4033946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tetrakisazo dyestuffs
Assignee: Bayer AG
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Filing: 1972-08-14
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Granted: 1977-07-05
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Expires: 1992-08-14
Abstract
Abstract The subject matter of the present invention relates to tetrakisazo dyestuffs which in the acid form correspond to the formula ##STR1## wherein R = H or substituent, R 1 = h or SO 3 H Z 1 , z 2 = an optionally substituted amino group, n = 1 or 2 m = 1 or 2, n + m being ≦3 and wherein the rings A and B may have further substituents, for example, alkoxy groups such as methoxy groups. The new dyestuffs are suitable for the dyeing and printing of natural fibre materials, especially leather, and distinguish themselves by good fastness properties.
Inventors
- 👤 Hermann Goebel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:24
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/02; D06P3/04; D06P3/32; D06P3/3206; D06P3/3226; C; C09; C09B; C09B35/00; C09B35/50; C09B35/56
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
31 words
The tetrakisazo dyestuff which in the acid form correspond to the general formula ##STR9## wherein R' = H, CH 3 , or Cl R 1 = h or SO 3 H.
Claim 2
Dependent Claim
31 words
The tetrakisazo dyestuff which in the acid form correspond to the general formula ##STR9## wherein R' = H, CH 3 , or Cl R 1 = h or SO 3 H.
Claim 3
Dependent Claim
5 words
Dyestuff of the formula ##STR10##
Claim 4
Dependent Claim
5 words
Dyestuff of the formula ##STR10##
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) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |