Patent US1937409A successfully refreshed from Google Patents.
Patent US4055558A successfully refreshed from Google Patents.
US4055558A
Expired / Lapsed
US
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Tetrakisazo dyestuffs
Assignee: Bayer AG
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Filing: 1972-08-14
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Granted: 1977-10-25
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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 Z 1 , Z 2 = an optionally substituted amino group R = h or a non-ionogenic substituent, in particular halogen or alkyl, n = an integer of 1 to 3 The rings A and B possible having further substituents, for example, alkoxy groups, such as methoxy groups, and the substituents R as well as Z 1 and Z 2 being the same or different. The new dyestuffs are suitable for dyeing and printing of natural fiber materials 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 06:39
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
22 words
Tetrakisazo dyestuff which in the acid form corresponds to the formula ##STR8##wherein R' = H, CH 3 , or NO 2 .
Claim 2
Dependent Claim
22 words
Tetrakisazo dyestuff which in the acid form corresponds to the formula ##STR8##wherein R' = H, CH 3 , or NO 2 .
Claim 3
Dependent Claim
5 words
Dyestuff of the formula ##STR9##
Claim 4
Dependent Claim
5 words
Dyestuff of the formula ##STR9##
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) | 1980-10-24 | 1981-04-25 | 1981-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-24 | 1985-04-25 | 1985-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-24 | 1989-04-25 | 1989-10-25 | $7700.00 | Window Closed / Lapsed |