Patent US670118A successfully refreshed from Google Patents.
Patent US3678053A successfully refreshed from Google Patents.
US3678053A
Expired / Lapsed
US
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6,15 dialkoxy 5,14 diazo iso violanthrones
Assignee: Montedison SpA
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Filing: 1970-08-05
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Granted: 1972-07-18
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Expires: 1990-08-05
Abstract
Abstract A novel class of compounds are provided which are 6,15-dialkoxy5,14-diaza-isoviolanthrones. The compounds are synthesized from 1-aza-2-hydroxy-benzanthrone via a novel process comprising bromination of the starting material to form 1-aza-2-hydroxy-3bromo-benzanthrone; the hydroxy group is then alkylated, followed by treatment with sodium sulfide to produce novel intermediates of the invention, 3,3-thio-bis(1-aza-2-alkoxy-benzanthrones). The 6,15-dialkoxy-5,14-diaza-isoviolanthrones of this invention are excellent blue vat dyes, which yield bright blue shades on cellulosic fibers. The dyeings have been found to possess excellent fastness properties.
Inventors
- 👤 Gloacchino Boffa
- 👤 Argento Crotti
- 👤 Giampiero Pieri
- 👤 Angelo Mangini
- 👤 Antonio Tundo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:36
CPC Classifications
C; C09; C09B; C09B5/00; C09B5/02; C09B5/022; C09B5/028; C09B5/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
9 words
The compound of claim 1, wherein R is methyl.
Claim 2
Dependent Claim
9 words
The compound of claim 1, wherein R is ethyl.
Claim 3
Dependent Claim
9 words
The compound of claim 1, wherein R is n-propyl.
Claim 4
Dependent Claim
9 words
The compound of claim 1, wherein R is iso-propyl.
Claim 5
Dependent Claim
9 words
The compound of claim 1, wherein R is n-butyl.
Claim 6
Dependent Claim
9 words
The compound of claim 1, wherein R is sec-butyl.
Claim 7
Dependent Claim
9 words
The compound of claim 1, wherein R is tert-butyl.
References Cited (Backward Citations)
DE635925C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |