US3625938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenyl-azo-phenyl dyestuffs
Assignee: BASF Schweiz AG
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Filing: 1968-02-13
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Granted: 1971-12-07
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Expires: 1988-02-13
Abstract
Abstract WHEREIN D monocyclic or bicyclic diazo residue; d is hydrogen, alkyl, or alkoxy; R is alkyl, R'' is alkyl or aryl; and R1 and R2 are hydrogen, alkyl, alkyl-carbonyloxy alkyl, hydrogen ethyl or cyanoethyl only one of R1 and R2 being hydrogen at one time. The dyestuffs are useful for dyeing polyester fibers. Monoazo dyestuffs of the formula
Inventors
- 👤 Ved Parkash Kubba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:59
CPC Classifications
C; C09; C09B; C09B43/00; C09B43/12; C09B43/124; C09B43/1247; Y; Y10; Y10S; Y10S8/00; Y10S8/933
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
6 words
A monoazo dyestuff of the formula
Claim 2
Dependent Claim
12 words
A monoazo dyestuff according to claim 2 which corresponds to the formula
Claim 3
Dependent Claim
12 words
A monoazo dyestuff according to claim 2 which corresponds to the formula
Claim 4
Dependent Claim
12 words
A monoazo dyestuff according to claim 2 which corresponds to the formula
Claim 5
Dependent Claim
12 words
A monoazo dyestuff according to claim 2 which corresponds to the formula
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) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |