Patent US3625937A successfully refreshed from Google Patents.
US3625937A
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Chromium mixed complex azo dyestuffs
Assignee: Bayer AG
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Filing: 1968-01-19
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Granted: 1971-12-07
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Expires: 1988-01-19
Abstract
Abstract Chromium complex azo dyestuffs suitable for dyeing and printing nitrogen containing fiber materials particularly wool, silk, synthetic polyamides and polyurethanes in shades of yellow to orange color with improved fastness properties of the general formula WHEREIN K is a monovalent cation, I is a monoazo dyestuff of the formula AND II
Inventors
- 👤 Walter Scholl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:22
CPC Classifications
C; C09; C09B; C09B45/00; C09B45/02; C09B45/14; C09B45/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
15 words
The dyestuff of claim 1 containing substantially 1 mol of the dyestuff of the formula
Claim 2
Dependent Claim
15 words
The dyestuff of claim 1 containing substantially 1 mol of the dyestuff of the formula
Claim 3
Dependent Claim
15 words
The dyestuff of claim 1 containing substantially 1 mol of the dyestuff of the formula
Claim 4
Dependent Claim
15 words
The dyestuff of claim 1 containing substantially 1 mol of the dyestuff of the formula
Claim 5
Dependent Claim
15 words
The dyestuff of claim 1 containing substantially 1 mol of the dyestuff of the formula
References Cited (Backward Citations)
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Cited
US3221003A
Cited
US3005813A
Cited
US2806760A
Cited
US3203948A
Cited
US3213079A
Cited
US3314932A
Cited
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 |