Patent US4681932A successfully refreshed from Google Patents.
US4681932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Benzoisothiazole azo dyestuffs
Assignee: Bayer AG
•
Filing: 1985-06-27
•
Granted: 1987-07-21
•
Expires: 2005-06-27
Abstract
Abstract Azo dyestuffs of the formula ##STR1## wherein R 1 denotes hydrogen, C 1 -C 4 -alkoxy or C 1 -C 4 -alkoxyethoxy and X denotes acyl, are distinguished by good levelling properties and good allround fastness properties. They dye polyester fibres in a bright blue shade.
Inventors
- 👤 Winfried Kruckenberg
- 👤 Klaus Leverenz
- 👤 Hans-Gunter Otten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:18
CPC Classifications
C; C09; C09B; C09B29/00; C09B29/34; C09B29/36; C09B29/3604; C09B29/3617; C09B29/0025; C09B29/0074; C09B29/0077; C09B29/0081; C09B67/00; C09B67/0025; C09B67/0028; C09B67/0029; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/922
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
23 words
An azo dyestuff of the formula ##STR4## wherein R 1 denotes hydrogen and R 2 denotes hydrogen or C 1 -C 2 -alkyl.
Claim 2
Dependent Claim
23 words
An azo dyestuff of the formula ##STR4## wherein R 1 denotes hydrogen and R 2 denotes hydrogen or C 1 -C 2 -alkyl.
Claim 3
Dependent Claim
17 words
An azo dyestuff according to claim 1, wherein R 1 denotes hydrogen and R 2 denotes methyl.
Claim 4
Dependent Claim
35 words
A modification which is stable to dyeing of the dyestuff according to claim 2, characterized by the lattice plane spacing d/Å 3.39, 3.49, 3.49 and 4.18 having the relative intensities 100, 80 and 80 respectively.
References Cited (Backward Citations)
US3455898A
Cited
DE2222639A1
Cited
US4292239A
Cited
US4465628A
Cited
GB2036809A
Cited
US4488992A
Cited
DE3005865A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-07-20 | 1991-01-19 | 1991-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-20 | 1995-01-19 | 1995-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-20 | 1999-01-19 | 1999-07-21 | $7700.00 | Window Closed / Lapsed |